SFI SYSTEM, Diagnostic DTC:P1604

DTC Code DTC Name
P1604 Startability Malfunction

DESCRIPTION

This DTC is stored when the engine does not start even though the STA signal is input or when the engine takes a long time to start, and when the engine speed is low or the engine stalls just after the engine starts.

Using the intelligent tester, the conditions present when the DTC was stored can be confirmed by referring to the freeze frame data. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. This information can be useful when troubleshooting.

It is necessary to check if the vehicle ran out of fuel before performing troubleshooting, as this DTC is also stored when there is engine starting trouble due to running out of fuel.

DTC No. DTC Detection Condition Trouble Area
P1604

Either condition is met:


  • The engine speed is below 500 rpm with the STA signal on for a certain amount of time (refer to the illustration below)

    (1 trip detection logic)

  • After the engine starts (engine speed is 500 rpm or more), the engine speed drops to 200 rpm or less within approximately 2 seconds

    (1 trip detection logic)

  • Immobiliser system

  • Engine assembly (excess friction, compression loss)

  • Starter assembly

  • Crankshaft position sensor

  • Camshaft position sensor

  • VVT sensor

  • Engine coolant temperature sensor

  • Fuel pump (for low pressure)

  • Fuel pump (for low pressure) control system

  • Fuel pipes

  • Fuel injector for port injection

  • Throttle body assembly

  • Pressure regulator

  • Battery

  • Drive plate

  • Spark plug

  • Ignition coil assembly

  • Intake system

  • Camshaft timing oil control valve

  • VVT-iE system

  • Mass air flow meter

  • Air fuel ratio sensor

  • Valve timing

  • Fuel

  • Purge VSV

  • Intake valve

  • Exhaust valve

  • ECM
A01625JE02

  1. Reference waveforms showing a normal cold engine start

    A015YR2

  2. Reference waveforms showing a normal warm engine start

    A0160WP

  3. Reference waveforms showing an engine stop after normal idling

    A015YRL

  4. Reference values when there is an air leak in the intake system during starting difficulty

    Freeze Frame Data P1604 Startability Malfunction
    Engine
    Current P1604: Startability Malfunction
    Time Freeze Frame Data
    Item Data1 Data2 Data3 Data4 Data5 Unit
    Engine Speed 1489 769 364 197 114 rpm
    Calculate Load 25.0 26.6 31.7 28.6 89.0 %
    Vehicle Load 13.7 12.9 15.2 8.2 12.1 %
    MAF 10.12 5.04 2.79 0.81 0.68 gm/sec
    Atmosphere Pressure 101 101 101 101 101 kPa
    Coolant Temp 93 93 93 93 93 °C
    Intake Air 37 37 37 37 37 °C
    Battery Voltage 13.281 13.398 12.792 12.675 12.695 V
    Throttle Sensor Volt % 17.6 16.0 20.3 17.6 17.6 %
    Throttle Sensor #2 Volt % 49.8 47.4 52.9 49.4 49.4 %
    Throttle Sensor Position 0.0 0.0 1.1 0.0 0.0 %
    Throttle Motor DUTY 17.6 16.0 20.3 17.6 17.6 %
    Injector (Port) 2604 0 0 0 0 μs
    Injection Volume (Cylinder 1) 0.155 0.100 0.100 0.100 0.184 ml
    Fuel Pump/Speed Status ON ON ON ON ON
    Injection Time (D4) 943 1173 2492 2135 2135 μs
    EVAP (Purge) VSV 0.0 0.0 0.0 0.0 0.0 %
    Evap Purge Flow 0.0 0.0 0.0 0.0 0.0 %
    Purge Density Learn Value 0.000 0.000 0.000 -0.617 0.000
    EVAP System Vent Valve OFF OFF OFF OFF OFF
    EVAP purge VSV OFF OFF ON OFF ON
    Purge Cut VSV Duty 0.0 0.0 0.0 0.0 0.0 %
    Target Air-Fuel Ratio 0.940 0.992 0.992 0.992 0.874
    AF Lambda B1S1 1.002 0.990 1.232 1.026 1.232
    AF Lambda B2S1 0.993 0.993 1.232 1.014 1.232
    AFS Voltage B1S1 3.317 3.268 4.996 3.488 4.996 V
    AFS Voltage B2S1 3.288 3.278 4.996 3.454 4.996 V
    O2S B1S2 0.055 0.115 0.075 0.115 0.055 V
    O2S B2S2 0.055 0.115 0.075 0.115 0.055 V
    Short FT #1 0.000 8.593 19.531 9.375 0.000 %
    Long FT #1 0.000 0.000 0.000 0.000 -6.250 %
    Total FT #1 0.117 0.000 0.000 0.000 0.000
    Sort FT #2 0.000 7.812 19.531 10.937 0.000 %
    Long FT #2 0.000 0.000 0.000 0.000 -4.688 %
    Total FT #2 0.109 0.000 0.000 0.000 0.000
    Fuel System Status #1 CL CL CL CL CL
    Fuel System Status #2 CL CL CL CL CL
    IGN Advance 16.5 15.0 16.0 18.0 11.5 deg
    Knock Feedback Value -3.0 -3.0 -3.0 -3.0 -3.0 CA
    Knock Correct Learn Value 15.6 15.6 15.6 15.6 15.6 CA
    Starter Signal Close Close Close Close Close
    Ambient Temp for A/C 26 26 26 26 26 °C

INSPECTION PROCEDURE

Tech Tips


  • In contrast to normal malfunction diagnosis for components, circuits and systems, DTC P1604 is used to determine the malfunctioning area from the problem symptoms and freeze frame data when the user mentions problems such as starting difficulty.

    As these DTCs can be stored as a result of certain user actions, even if these DTCs are output, if the customer makes no mention of problems, clear these DTCs without performing any troubleshooting and return the vehicle to the customer.

  • If any other DTCs are output, perform troubleshooting for those DTCs first.

  • When the Data List item "Immobiliser Fuel Cut" is ON, the engine cannot be started.

  • Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. This information can be useful when troubleshooting.

  • When confirming the freeze frame data, be sure to check all 5 sets of freeze frame data Click here.

  • When confirming freeze frame data, if there are multiple items related to the cause of the malfunction, perform troubleshooting for all related items.

  • Try to start the vehicle under the conditions recorded in the freeze frame data which were present when the malfunction occurred. Confirm the data at this time and compare it with the freeze frame data.

  • If the malfunction does not reoccur, carefully check the vehicle conditions from when the malfunction occurred using freeze frame data.

  • When performing inspections, jiggle the relevant wire harnesses and connectors in an attempt to reproduce malfunctions that do not always occur.

  • If the same inspection or replacement procedure appears 2 times when performing an inspection procedure, it is not necessary to repeat the procedure the second time.


  1. Malfunction Recurrence and Inspection Areas


    1. Freeze frame data exists, but the malfunction (starting difficulty) has not reoccurred and the malfunction conditions are unknown.


      1. The engine speed recorded in the freeze frame data is 0 rpm (the engine does not crank).

        Tech Tips

        One of the following problems may be present: battery depletion, excess engine friction, a starter malfunction or a crankshaft position sensor malfunction.


        • If the battery voltage is less than 6 V during cranking, there is a high probability that engine friction is abnormal.

        • If the battery voltage drops to 5 V or less when starting the engine, the battery may be malfunctioning.

        • If the battery voltage fluctuates while cranking the engine, it can be concluded that cranking is being performed. When the engine speed is 0 rpm, the crankshaft position sensor and/or ECM may be malfunctioning.

          A01601EE03

      2. All engine speeds recorded in the freeze frame data are between 100 and 250 rpm (the engine cranks but there is no combustion).

        Tech Tips

        If the engine speed is between 100 and 250 rpm (no initial combustion), there may be a wiring problem or a complete failure of an ignition or fuel system part.


        • Due to an engine coolant temperature sensor malfunction, the fuel injection volume is extremely high or low and the engine may not be able to be started.

          A01608OE01

      3. The engine speed recorded in the freeze frame data is 250 rpm or higher (the initial combustion and starter turnoff timing is too late).

        Tech Tips

        If the engine speed is 250 rpm or higher (combustion occurs but the initial combustion and starter turnoff timing is too late), the fuel injection volume is often incorrect (too low or too high) and determining the cause of the malfunction is often difficult.


        • Due to an engine coolant temperature sensor malfunction, the fuel injection volume is extremely high or low and engine starting trouble may occur.

        • If Long FT is incorrect, there may be a fuel supply problem due to the injectors or fuel pump being clogged, etc.

        • If the engine cranking speed is too high, compression loss may have occurred due to carbon interfering with the valve operation.

          A01601EE04

    2. When the malfunction (starting difficulty) can be reproduced, or malfunction conditions are known, perform the following inspections ("Problem symptoms" and "Systems to inspect").


      1. Problem symptoms


        1. The engine does not crank.

          Tech Tips

          The starter is normal if a noise that indicates the starter pinion gear is extending is heard. The battery may be fully depleted or there may be excess engine friction.

        2. The engine cranking speed is abnormal.

          Tech Tips

          If the engine cranking speed is too high (for example, 300 rpm or higher with no combustion), compression loss may have occurred because carbon interfered with valve operation, etc.

        3. There is no initial combustion.

          Tech Tips

          If there is no initial combustion, there is probably a wiring problem or an ignition or fuel system part malfunction.

        4. The engine stalls after starter turnoff.

          Tech Tips

          If the engine stalls after starter turnoff, the air-fuel ratio may be incorrect or the VVT may have a problem returning.

        5. The initial combustion and starter turnoff occur late.

          Tech Tips

          If the initial combustion and starter turnoff occur late, the fuel injection volume is probably incorrect (too low or too high).

          Tech Tips

          Causes of fuel system malfunctions according to conditions present at the time of the malfunction.


          • When 2 to 3 minutes have elapsed after stopping the engine: Fuel pressure loss due to the pressure regulator failing to maintain the fuel pressure.

          • When 15 to 120 minutes have elapsed after stopping the engine: Problem with injector fuel seal.

          • When a long time has elapsed after stopping the engine: Pressure regulator is stuck open.

      2. Systems to inspect


        1. Intake system

        2. Ignition system

        3. Fuel system

  2. INSPECTION FLOW


    1. Freeze frame data exists, but the malfunction (starting difficulty) has not reoccurred and the malfunction conditions are unknown.

      Freeze Frame Data Item Result Suspected Area Procedure
      Engine Speed 0 rpm (no engine cranking at all)

      • Battery fully depleted

      • Engine assembly (excess friction)

      • Starter assembly

      • Immobiliser system

      • Crankshaft position sensor

      • ECM

      		 4 to 9
      100 to 250 rpm (engine cranks but no initial combustion*1)

      • Fuel pump (for low pressure) control system

      • Ignition system

      • Engine coolant temperature sensor

      • Fuel injection system

      		 10 to 14
      250 rpm or higher (combustion occurs but initial combustion and starter turnoff*2 occur late)

      • Engine assembly (compression loss)

      • Fuel injection system

      • Fuel pump (for low pressure) control system

      		 15 to 23

      Tech Tips


      • *1: First combustion after cranking begins.

      • *2: Condition when engine speed increases and the starter can be turned off.

    2. When the malfunction (starting difficulty) can be reproduced, or when malfunction conditions are known.


      1. Problem symptoms

        Problem Symptom Suspected Area Suspected Component Procedure
        The engine does not crank Battery malfunction Battery fully depleted 26 to 31
        Starting system

        • Starter (includes pinion gear wear or tooth damage)

        • Starting system
        Immobiliser system Immobiliser system
        Engine assembly

        • Engine assembly (excess friction)

        • Drive plate wear or tooth damage
        Cranking speed too low Battery malfunction Battery fully depleted 32 to 34
        Starting system Starter assembly
        Engine assembly Engine assembly (excess friction)
        Cranking speed too high Engine assembly Engine assembly (compression loss)
        There is no initial combustion Fuel supply problem

        • Maintenance of fuel pressure by pressure regulator

        • Fuel injector leak

        • Fuel leak from fuel line

        • Fuel pump (for low pressure) control system

        • Fuel pump (for low pressure)

        		 35 to 50
        Ignition system malfunction

        • Spark plug

        • Crankshaft position sensor

        • Ignition coil
        Engine stalls after starter turnoff Air suction Intake system connections 51 to 57
        Deposits in throttle body Throttle body
        VVT valve does not return properly

        • Camshaft timing oil control valve assembly

        • VVT-iE system
        Mass air flow meter malfunction Mass air flow meter
        The initial combustion and starter turnoff occur late Engine coolant temperature sensor malfunction Engine coolant temperature sensor 58 to 71
        Mass air flow meter malfunction Mass air flow meter
        Abnormal air fuel ratio learning value Air fuel ratio sensor
        Deviation from fuel injection characteristics Fuel injector for port injection
        Wet-fouled or dry-fouled spark plug Spark plug
        Lack of fuel pressure

        • Pressure regulator

        • Fuel pump (for low pressure)

        • Fuel pump (for low pressure) control system

      2. Systems to inspect

        Troubleshooting by System Suspected Area Suspected Component Procedure
        Fuel system troubleshooting A Abnormal air fuel ratio learning value Fuel injector for port injection

        92 to 99

        100 to 107
        Rough idling Crankshaft position sensor
        Abnormal fuel pressure

        • Fuel

        • Fuel leak from fuel line

        • Fuel pump (for low pressure)

        • Pressure regulator
        Fuel system troubleshooting B Abnormal concentration of HC in surge tank

        • Purge VSV system

        • Fuel injector for port injection

        		 108 to 110
        Fuel system troubleshooting C Injection signal system malfunction

        • Fuel injector for port injection

        • Crankshaft position sensor

        • Camshaft position sensor

        • VVT sensor

        • ECM

        		 73 to 78
        Intake system troubleshooting Difference between ISC target value and opening angle when idling

        • Engine assembly (compression loss)

        • Valve timing

        • Engine coolant temperature sensor

        • ECM

        89 to 91

        111 to 113
        Ignition system troubleshooting Camshaft and/or crankshaft position sensor signal malfunction

        • Crankshaft position sensor system (including sensor installation)

        • Camshaft position sensor system (including sensor installation)

        • VVT sensor system (including sensor installation)

        • ECM

        79 to 88

        114 to 123

    Note

    Inspect the fuses for circuit related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT AND RECORD FREEZE FRAME DATA (IN ADDITION TO DTC P1604)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine / DTC.

    5. A0162XPE46

      Read the DTCs and record the freeze frame data.

      Tech Tips


      • This freeze frame data shows the actual engine conditions when engine starting trouble occurred.

      • When confirming the freeze frame data, be sure to check all 5 data sets of freeze frame data.

      • The fourth set of freeze frame data is the data recorded when the DTC is stored.

      Result
      Result Proceed to
      Only DTC P1604 is output A
      DTCs other than P1604 are output B

    B

    GO TO DTC CHART Click here

    A

  2. CHECK ENGINE IMMOBILISER SYSTEM


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine / Data List / All Data / Immobiliser Fuel Cut.

    5. Read the value displayed on the tester.

      OK
      Immobiliser Fuel Cut is OFF.

      Tech Tips

      If the engine is cranked immediately after reconnecting the battery cable (key verification for immobiliser system not completed), the engine cannot be started. Key verification needs to wait for several seconds after turning the engine switch on (IG).


    NG

    REPAIR ENGINE IMMOBILISER SYSTEM Click here

    OK

  3. CHECK MALFUNCTION CONDITION


    1. Confirm the problem symptoms.

      Result
      Result Proceed to
      Freeze frame data exists, but the problem symptoms cannot be reproduced and the malfunction conditions are unknown A
      The problem symptoms can be reproduced, or the malfunction conditions are known B

    B

    CHECK MALFUNCTION CONDITION Click here

    A

  4. READ FREEZE FRAME DATA


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Using the tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

      Result
      Freeze Frame Data Item for DTC P1604 Suspected Area Proceed to
      Engine Speed Battery Voltage
      All 0 rpm (no engine cranking at all) Minimum voltage is less than 5 V Battery fully depleted A
      Minimum voltage is 5 V or higher

      • Starter malfunction

      • Crankshaft position sensor system

      • Excess engine friction

      • Immobiliser system

      • ECM

      		 B
      100 to 250 rpm (engine cranks but no initial combustion) -

      • Fuel pump (for low pressure) control system

      • Ignition system

      • Engine coolant temperature sensor

      • Immobiliser system

      • Fuel injection system

      		 C
      250 rpm or higher (combustion occurs but initial combustion and starter turnoff occur late) -

      • Engine assembly

      • Fuel injection system

      • Fuel pump (for low pressure) control system

      		 D

      Tech Tips

      When DTC P1604 is stored, either "Engine Start Hesitation"*1 or "Low Rev for Eng Start"*2 in the Freeze Frame Data will be ON. If "Low Rev for Eng Start" is ON, proceed to E.

      *1: "Engine Start Hesitation" turns ON when the engine speed does not reach a certain value for a certain period of time when starting the engine.

      *2: "Low Rev for Eng Start" turns ON when the engine stalls immediately after starting the engine. If "Low Rev for Eng Start" is ON, as there is a possibility that the low engine speed or engine stall was caused by the user, confirm the following freeze frame data items.


      • Immobiliser Fuel Cut

      • Engine Speed (Starter OFF)

      • Shift SW Status (R, D Range)


    B

    READ FREEZE FRAME DATA Click here

    C

    READ FREEZE FRAME DATA Click here

    D

    READ FREEZE FRAME DATA Click here

    E

    INSPECT MASS AIR FLOW METER Click here

    A

    CHARGE OR REPLACE BATTERY

  5. READ FREEZE FRAME DATA


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Using the tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

      Result
      Freeze Frame Data Item for DTC P1604 Result Suspected Area Proceed to
      Battery Voltage Minimum voltage is 6 V or higher and voltage does not fluctuate*1 Starter system A
      Minimum voltage is 6 V or higher and voltage fluctuates*2, *3

      • Crankshaft position sensor system

      • ECM

      		 B
      Minimum voltage is 5 to 6 V*4

      • Excess engine friction

      • Battery fully depleted

      		 C

      Tech Tips


      • A015ZCZE01

        *1: The 5 sets of freeze frame data show approximately the same battery voltage.

      • *2: The 5 sets of freeze frame data show different battery voltages.

      • *3: If the voltage fluctuates, it can be determined that cranking is being performed normally. When the engine speed is 0 rpm, the crankshaft position sensor system and/or the ECM may be malfunctioning.

      • *4: There may be excess engine friction. Make sure that the crankshaft rotates smoothly when turning it by hand. Excess engine friction may have occurred temporarily. Remove the cylinder head covers and oil pan, and check for foreign matter such as metal fragments. If there is a malfunction or signs of a malfunction present, perform a detailed inspection by disassembling all the parts.


    B

    CHECK CRANKSHAFT POSITION SENSOR INSTALLATION Click here

    C

    CHECK AND REPAIR ENGINE OR BATTERY

    A

    CHECK CRANKING HOLDING FUNCTION CIRCUIT Click here

  6. CHECK CRANKSHAFT POSITION SENSOR INSTALLATION


    1. Check the tightening and installation condition of the crankshaft position sensor bolt.

    2. Check the connection of the crankshaft position sensor connector.


    NG

    SECURELY REINSTALL CRANKSHAFT POSITION SENSOR Click here

    OK

  7. CHECK CRANKSHAFT POSITION SENSOR


    1. Disconnect the crankshaft position sensor connector.

    2. Check for oil on the connector terminals.

      OK
      No oil on the terminals.

    3. Reconnect the crankshaft position sensor connector.


    NG

    REPLACE CRANKSHAFT POSITION SENSOR Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)


    1. Disconnect the crankshaft position sensor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      z4-1 (NE) - E3-27 (NE+) Always Below 1 Ω
      z4-2 (NE-) - E3-34 (NE-) Always Below 1 Ω
      z4-3 (VC) - E3-18 (VC) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      z4-1 (NE) or E3-27 (NE+) - Body ground Always 10 kΩ or higher
      z4-2 (NE-) or E3-34 (NE-) - Body ground Always 10 kΩ or higher
      z4-3 (VC) or E3-18 (VC) - Body ground Always 10 kΩ or higher

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

    4. Reconnect the ECM connector.

    5. Reconnect the crankshaft position sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. REPLACE CRANKSHAFT POSITION SENSOR


    1. Replace the crankshaft position sensor Click here.

    2. Check the engine start operation.

      OK
      Malfunction has been repaired successfully.

    NG

    REPLACE ECM Click here

    OK

    END (CRANKSHAFT POSITION SENSOR WAS DEFECTIVE)

  10. READ FREEZE FRAME DATA


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Using the tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

      Result
      Freeze Frame Data Item for DTC P1604 Suspected Area Proceed to
      Coolant Temp, Ambient Temp for A/C, Intake Air Coolant Temp, Ambient Temp for A/C Fuel Pump/Speed Status
      Difference between Coolant Temp, Ambient Temp for A/C and Intake Air is 10°C (18°F) or more*1 Coolant Temp is 125°C (257°F) or more, or lower than Ambient Temp for A/C by 15°C (27°F) or more - Engine coolant temperature sensor A
      Other than above All 5 sets of freeze frame data are ON - B
      At least 1 of the 5 sets of freeze frame data is OFF Fuel pump (for low pressure) control system C
      Difference between Coolant Temp, Ambient Temp for A/C and Intake Air is less than 10°C (18°F)*2 - At least 1 of the 5 sets of freeze frame data is OFF Fuel pump (for low pressure) control system C
      All 5 sets of freeze frame data are ON - B

      Tech Tips


      • *1: A long time had not elapsed after stopping the engine.

      • *2: A long time had elapsed after stopping the engine.


    B

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE FUEL PUMP/SPEED) Click here

    C

    CHECK FUEL PUMP CONTROL CIRCUIT Click here

    A

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

  11. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE FUEL PUMP/SPEED)


    1. A015YTIE06

      Connect the intelligent tester to the DLC3.

    2. Disconnect the fuel pump (for low pressure) connector.

    3. Turn the engine switch on (IG).

    4. Turn the tester on.

    5. Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump/Speed.

    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      Q14-4 - Body ground Active Test is being performed 11 to 14 V

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

    7. Reconnect the fuel pump (for low pressure) connector.


    NG

    CHECK FUEL PUMP CONTROL CIRCUIT Click here

    OK

  12. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR FOR PORT INJECTION POWER SOURCE)


    1. Disconnect the fuel injector for port injection connectors.

    2. Turn the engine switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I9-2 - Ground Engine switch on (IG) 11 to 14 V
      I10-2 - Ground Engine switch on (IG) 11 to 14 V
      I11-2 - Ground Engine switch on (IG) 11 to 14 V
      I12-2 - Ground Engine switch on (IG) 11 to 14 V
      H9-2 - Ground Engine switch on (IG) 11 to 14 V
      H10-2 - Ground Engine switch on (IG) 11 to 14 V
      H11-2 - Ground Engine switch on (IG) 11 to 14 V
      H12-2 - Ground Engine switch on (IG) 11 to 14 V

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

    4. Reconnect the fuel injector for port injection connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR FOR PORT INJECTION - IG2 RELAY)

    OK

  13. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE FUEL PUMP/SPEED)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump/Speed.

    5. When performing the Active Test, check for fuel leakage from the fuel pipes.

      Result
      Result Proceed to
      Fuel leakage or signs of fuel leakage are present A
      No fuel leakage or signs of fuel leakage B

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • When performing the Active Test, if there is no operating noise from the fuel pump (for low pressure), the fuel pump (for low pressure) system may be malfunctioning.

      • Check if the vehicle ran out of fuel, as engine starting trouble due to running out of fuel is also detected.


    B

    CHECK FUEL SYSTEM Click here

    A

    REPAIR OR REPLACE FUEL LINE

  14. CHECK FUEL SYSTEM


    1. Check for foreign matter such as iron particles around the fuel pump (for low pressure) (fuel pump, fuel pump filter, and inside the fuel tank), and for signs that the fuel pump (for low pressure) was stuck.

      Result
      Result Proceed to
      There is foreign matter or signs that fuel pump (for low pressure) was stuck A
      There is no foreign matter and no signs that fuel pump (for low pressure) was stuck B

    B

    PERFORM SIMULATION TEST Click here

    A

    REPAIR OR REPLACE FUEL SYSTEM

  15. READ FREEZE FRAME DATA


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Using the tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

      Result
      Freeze Frame Data Item for DTC P1604 Suspected Area Proceed to
      Coolant Temp, Ambient Temp for A/C, Intake Air Coolant Temp, Ambient Temp for A/C Long FT Engine Speed
      Difference between Coolant Temp, Ambient Temp for A/C and Intake Air is 10°C (18°F) or more Coolant Temp is 125°C (257°F) or more, or lower than Ambient Temperature by 15°C (27°F) or more - - Engine coolant temperature sensor A
      Other than above -15% or less, or +15% or more -

      • Fuel pump (for low pressure) control system

      • Fuel injector for port injection

      		 B
      -15 to +15% Minimum speed is 300 rpm or more* Engine assembly C
      Minimum speed is below 300 rpm

      • Fuel system

      • Intake air system

      		 D
      Difference between Coolant Temp, Ambient Temp for A/C and Intake Air is less than 10°C (18°F) - -15% or less, or +15% or more -

      • Fuel pump (for low pressure) control system

      • Fuel injector for port injection

      		 B
      -15 to +15% Minimum speed is 300 rpm or more* Engine assembly C
      Minimum speed is below 300 rpm

      • Fuel system

      • Intake air system

      		 D

      Tech Tips

      *: Compression loss may have occurred in the engine assembly.


    B

    INSPECT FUEL INJECTOR FOR PORT INJECTION Click here

    C

    CHECK AND REPAIR ENGINE ASSEMBLY

    D

    READ FREEZE FRAME DATA Click here

    A

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

  16. INSPECT FUEL INJECTOR FOR PORT INJECTION


    1. Check that no carbon is stuck to the fuel injector for port injection.

      OK
      No carbon present.

    NG

    REPLACE FUEL INJECTOR FOR PORT INJECTION Click here

    OK

  17. CHECK FUEL SYSTEM


    1. Check for foreign matter such as iron particles around the fuel pump (for low pressure) (fuel pump, fuel pump filter, and inside the fuel tank), and for signs that the fuel pump (for low pressure) was stuck.

      Result
      Result Proceed to
      There is foreign matter or signs that fuel pump (for low pressure) was stuck A
      There is no foreign matter and no signs that fuel pump (for low pressure) was stuck B

    B

    PERFORM SIMULATION TEST Click here

    A

    REPAIR OR REPLACE FUEL SYSTEM

  18. READ FREEZE FRAME DATA


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Using the tester, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

      Result
      Freeze Frame Data Item for DTC P1604 Result Suspected Area Proceed to
      Coolant Temp Engine coolant temperature is 40°C (104°F) or less*1 Pressure regulator A
      Engine coolant temperature is 40 to 90°C (104 to 194°F)*2 Fuel injector for port injection B
      Engine coolant temperature is 90°C (194°F) or more*3 Pressure regulator A

      Tech Tips

      *1: If the engine coolant temperature is 40°C (104°F) or less (after stopping the engine and the vehicle is not driven for a long period of time), the pressure regulator may be stuck open. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine.

      *2: If the engine coolant temperature is 40 to 90°C (104 to 194°F) (15 to 120 minutes have passed after stopping the engine), there may be fuel leaking from a fuel injector.

      *3: If the engine coolant temperature is 90°C (194°F) or more (2 to 5 minutes have passed after stopping the engine), there may be a problem with the pressure regulator failing to maintain the fuel pressure. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine.


    B

    CHECK FUEL INJECTOR FOR PORT INJECTION Click here

    A

  19. CHECK FUEL PRESSURE (LOW PRESSURE SIDE)

    Tech Tips

    For the fuel pressure inspection, refer to the following procedures Click here.


    1. Attach a fuel pressure gauge and check the fuel pressure after stopping the engine.

      Standard
      147 kPa (1.5 kgf/cm2, 21 psi) or higher (5 minutes after stopping the engine)

      Tech Tips

      If the engine cannot be started, read the values after cranking the engine.

      Result
      Result Proceed to
      NG A
      OK B

    B

    PERFORM SIMULATION TEST Click here

    A

    REPLACE PRESSURE REGULATOR Click here

  20. CHECK FUEL INJECTOR FOR PORT INJECTION


    1. Clean the inside of the surge tank with compressed air.

    2. After stopping the engine, measure the HC concentration inside the surge tank for 15 minutes.

      Result
      Result Proceed to
      400 ppm or higher A
      Less than 400 ppm B

      Tech Tips

      If the concentration is 400 ppm or higher, a fuel injector may have a sealing problem.


    B

    CHECK THROTTLE BODY ASSEMBLY Click here

    A

  21. CHECK FUEL INJECTOR FOR PORT INJECTION


    1. Inspect the fuel injectors Click here.

      Result
      Result Proceed to
      NG A
      OK B

    B

    CHECK THROTTLE BODY ASSEMBLY Click here

    A

    REPLACE FUEL INJECTOR FOR PORT INJECTION Click here

  22. CHECK THROTTLE BODY ASSEMBLY


    1. Check if carbon is in the air flow passage.

      Result
      Result Proceed to
      Carbon in passage A
      No carbon present B

    B

    CHECK INTAKE SYSTEM Click here

    A

    CLEAN OR REPLACE THROTTLE BODY ASSEMBLY Click here

  23. CHECK INTAKE SYSTEM


    1. Check the intake system for vacuum leaks Click here.

      OK
      No leaks in intake system.

    NG

    REPAIR OR REPLACE INTAKE SYSTEM

    OK

  24. PERFORM SIMULATION TEST


    1. Check if the engine can be started.

      Result
      Result Proceed to
      Engine can be started A
      Engine cannot be started B

    B

    CHECK MALFUNCTION CONDITION Click here

    A

    END

  25. CHECK MALFUNCTION CONDITION


    1. Confirm the problem symptoms.

      Tech Tips

      The problem symptoms below can be determined by reading the freeze frame data.

      Result
      Problem Symptom Suspected Area Proceed to
      The engine does not crank

      • Battery fully depleted

      • Starter (includes pinion gear wear or teeth damage)

      • Starter system

      • Engine assembly (excess friction)

      • Drive plate wear or teeth damage

      		 A
      Abnormal cranking speed

      • Battery fully depleted

      • Starter

      • Engine assembly (excess friction, compression loss)

      		 B
      There is no initial combustion (combustion does not occur even once)*1

      • Fuel pressure of pressure regulator maintained

      • Fuel injector leak

      • Fuel leak from fuel line

      • Fuel pump (for low pressure) control system

      • Fuel pump (for low pressure)

      • Spark plug

      • Crankshaft position sensor system

      • Ignition coil system

      		 C
      The engine stalls after starter turnoff (engine stalls immediately after the first time the engine speed increases)*2

      • Intake system connections

      • Throttle body

      • Camshaft timing oil control valve

      • Mass air flow meter system

      		 D
      The initial combustion and starter turnoff occur late*3

      • Engine coolant temperature sensor

      • Mass air flow meter

      • Air fuel ratio sensor

      • Heated oxygen sensor

      • Fuel injector for port injection

      • Spark plug

      • Pressure regulator

      • Fuel pump (for low pressure)

      • Fuel pump (for low pressure) control system

      		 E

      Tech Tips


      • If there is hesitation (cranking speed is slow and combustion occurs before passing TDC) during the initial cranking period, the battery charge may be insufficient or the starter may be malfunctioning.

      • *1: If there is no initial combustion, a wire harness, or the ignition or fuel system may be malfunctioning.

      • *2: If the engine stalls after starter turnoff, the air-fuel ratio may be incorrect or the camshaft timing oil control valve may have a problem returning.

      • *3: If the initial combustion and starter turnoff occur late, the fuel injection volume may be incorrect (too low or too high).


    B

    PERFORM SIMULATION TEST Click here

    C

    CHECK FUEL INJECTOR FOR PORT INJECTION Click here

    D

    INSPECT MASS AIR FLOW METER Click here

    E

    INSPECT ENGINE COOLANT TEMPERATURE SENSOR Click here

    A

  26. PERFORM SIMULATION TEST


    1. When cranking the engine, check for a noise indicating that the starter pinion gear is extending, and check whether the starter pinion gear is spinning freely.

      Result
      Problem Symptom Suspected Area Proceed to
      A noise indicating that the starter pinion gear is extending is heard and the starter pinion gear is not spinning freely*

      • Battery

      • Excess engine friction

      • Starter

      		 A
      A noise indicating that the starter pinion gear is extending is heard but the starter pinion gear is spinning freely

      • Drive plate

      • Starter

      		 B
      A noise indicating that the starter pinion gear is extending is not heard

      • Battery

      • Starter

      • Starter system

      		 C

      Tech Tips

      *: The battery may be fully depleted or there may be excess engine friction.


    B

    CHECK STARTER ASSEMBLY Click here

    C

    INSPECT BATTERY Click here

    A

  27. INSPECT BATTERY


    1. A015ZNCE01

      Check the electrolyte quantity.

      Standard
      Electrolyte quantity is within the specified range.

    2. Inspect the specific gravity.


      1. Inspect the specific gravity of each cell.

        Standard specific gravity
        1.25 to 1.29 (electrolyte is at 20°C (68°F))

        Tech Tips


        • If the result is not as specified, recharge or replace the battery.

        • It is not necessary to inspect a maintenance-free battery.

    3. Inspect the battery voltage.


      1. Turn the engine switch off and turn on the headlights for 20 to 30 seconds. This will remove the surface charge from the battery.

      2. Measure the battery voltage.

        Standard voltage
        12.5 to 12.9 V (electrolyte is at 20°C (68°F))

        Tech Tips


        • If the result is not as specified, recharge or replace the battery.

        • When the battery is depleted, the horn becomes quieter.

      3. Measure the battery voltage when cranking the engine.

        Standard
        Approximately 6 V or higher (0°C (32°F) or higher)

    NG

    CHARGE OR REPLACE BATTERY

    OK

  28. CHECK ENGINE ASSEMBLY


    1. Check that the crankshaft rotates smoothly when rotating it by hand.

      OK
      Crankshaft rotates smoothly.

      Tech Tips

      Excess engine friction may have occurred temporarily. Remove the cylinder head covers and oil pan, and check for foreign matter such as metal fragments. If there is a malfunction or signs of a malfunction present, perform a detailed inspection by disassembling all the parts.


    NG

    REPAIR OR REPLACE ENGINE ASSEMBLY

    OK

    INSPECT STARTER ASSEMBLY Click here

  29. CHECK STARTER ASSEMBLY


    1. Remove the starter assembly Click here.

    2. Check for starter pinion gear wear and damage.

      Standard
      There is no wear or damage.

    3. Install the starter assembly Click here.


    NG

    REPLACE STARTER ASSEMBLY Click here

    OK

    REPLACE DRIVE PLATE AND RING GEAR Click here

  30. INSPECT BATTERY


    1. A015ZNCE01

      Check the electrolyte quantity.

      Standard
      Electrolyte quantity is within the specified range.

    2. Inspect the specific gravity.


      1. Inspect the specific gravity of each cell.

        Standard specific gravity
        1.25 to 1.29 (electrolyte is at 20°C (68°F))

        Tech Tips


        • If the result is not as specified, recharge or replace the battery.

        • It is not necessary to inspect a maintenance-free battery.

    3. Inspect the battery voltage.


      1. Turn the engine switch off and turn on the headlights for 20 to 30 seconds. This will remove the surface charge from the battery.

      2. Measure the battery voltage.

        Standard voltage
        12.5 to 12.9 V (electrolyte is at 20°C (68°F))

        Tech Tips


        • If the result is not as specified, recharge or replace the battery.

        • When the battery is depleted, the horn becomes quieter.

      3. Measure the battery voltage when cranking the engine.

        Standard
        Approximately 6 V or higher (0°C (32°F) or higher)

    NG

    CHARGE OR REPLACE BATTERY

    OK

  31. INSPECT STARTER ASSEMBLY


    1. Inspect the starter assembly Click here.


    NG

    REPLACE STARTER ASSEMBLY Click here

    OK

    CHECK CRANKING HOLDING FUNCTION CIRCUIT Click here

  32. PERFORM SIMULATION TEST


    1. Check the cranking speed.

      Result
      Problem Symptom Suspected Area Proceed to
      Cranking speed is slow (100 rpm or less)

      • Battery

      • Starter assembly

      • Excess engine friction

      		 A
      Cranking speed is fast (300 rpm or more)* Engine compression loss B

      Tech Tips

      *: If the cranking speed is fast, there may be compression loss.


    B

    CHECK AND REPAIR ENGINE ASSEMBLY

    A

  33. INSPECT BATTERY


    1. A015ZNCE01

      Check the electrolyte quantity.

      Standard
      Electrolyte quantity is within the specified range.

    2. Inspect the specific gravity.


      1. Inspect the specific gravity of each cell.

        Standard specific gravity
        1.25 to 1.29 (electrolyte is at 20°C (68°F))

        Tech Tips


        • If the result is not as specified, recharge or replace the battery.

        • It is not necessary to inspect a maintenance-free battery.

    3. Inspect the battery voltage.


      1. Turn the engine switch off and turn on the headlights for 20 to 30 seconds. This will remove the surface charge from the battery.

      2. Measure the battery voltage.

        Standard voltage
        12.5 to 12.9 V (electrolyte is at 20°C (68°F))

        Tech Tips


        • If the result is not as specified, recharge or replace the battery.

        • When the battery is depleted, the horn becomes quieter.

      3. Measure the battery voltage when cranking the engine.

        Standard
        Approximately 6 V or higher (0°C (32°F) or higher)

    NG

    CHARGE OR REPLACE BATTERY

    OK

  34. CHECK ENGINE ASSEMBLY


    1. Check that the crankshaft rotates smoothly when rotating it by hand.

      OK
      Crankshaft rotates smoothly.

      Tech Tips

      Excess engine friction may have occurred temporarily. Remove the cylinder head covers and oil pan, and check for foreign matter such as metal fragments. If there is a malfunction or signs of a malfunction present, perform a detailed inspection by disassembling all the parts.


    NG

    REPAIR OR REPLACE ENGINE ASSEMBLY

    OK

    INSPECT STARTER ASSEMBLY Click here

  35. CHECK FUEL INJECTOR FOR PORT INJECTION


    1. Using a sound scope or screwdriver, check for a fuel injector for port injection operating noise while cranking the engine.

      OK
      Fuel injector for port injection operating noise is heard.

    NG

    READ VALUE USING INTELLIGENT TESTER (ENGINE SPEED) Click here

    OK

  36. CHECK FUEL PRESSURE (LOW PRESSURE SIDE)


    1. Inspect the fuel pressure (low pressure side) Click here.


    NG

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE FUEL PUMP/SPEED) Click here

    OK

  37. CHECK SPARK PLUG AND SPARK


    1. Check for sparks Click here.


    NG

    CHECK SPARK PLUG Click here

    OK

  38. CONFIRM VEHICLE CONDITION


    1. Confirm the conditions present when the malfunction occurred based on the customer problem analysis.

      Result
      Problem Symptom Suspected Area Proceed to
      When the engine is stopped and a long time has passed, engine starting trouble occurs*1 Pressure regulator is stuck open A
      When the engine is stopped and approximately 15 to 120 minutes have passed, engine starting trouble occurs*2 Fuel injector leak B
      When the engine is stopped and approximately 2 to 3 minutes have passed, engine starting trouble occurs*3 Failure to maintain fuel pressure by pressure regulator A
      Condition other than above, or there is an inconsistency in the conditions present when engine starting trouble occurs - C*4

      Tech Tips

      *1: The pressure regulator may be stuck open. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine.

      *2: Fuel may be leaking from a fuel injector for port injection.

      *3: The pressure regulator may not be able to maintain the fuel pressure. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine.

      *4: From step 72, perform fuel system troubleshooting C (steps 73 to 78).


    B

    CHECK FUEL INJECTOR FOR PORT INJECTION Click here

    C

    CHECK MALFUNCTION CONDITION Click here

    A

  39. CHECK FUEL PRESSURE (LOW PRESSURE SIDE)

    Tech Tips

    For the fuel pressure inspection, refer to the following procedures Click here.


    1. Attach a fuel pressure gauge and check the fuel pressure after stopping the engine.

      Result
      Result Proceed to

      Less than 147 kPa (1.5 kgf/cm2) (5 minutes after stopping the engine)

      		 A

      147 kPa (1.5 kgf/cm2) or higher (5 minutes after stopping the engine)

      		 B*

      Tech Tips


      • If the engine cannot be started, check the fuel pressure after cranking the engine.

      • *: From step 72, perform fuel system troubleshooting C (steps 73 to 78).


    B

    CHECK MALFUNCTION CONDITION Click here

    A

    REPLACE PRESSURE REGULATOR Click here

  40. CHECK FUEL INJECTOR FOR PORT INJECTION


    1. After stopping the engine, measure the HC concentration inside the surge tank for 15 minutes.

      Result
      Result Proceed to
      400 ppm or higher A
      Less than 400 ppm B*

      Tech Tips


      • If the concentration is 400 ppm or higher, a fuel injector may have a sealing problem.

      • *: From step 72, perform fuel system troubleshooting C (steps 73 to 78).


    B

    CHECK MALFUNCTION CONDITION Click here

    A

    REPLACE FUEL INJECTOR FOR PORT INJECTION Click here

  41. CHECK SPARK PLUG


    1. Inspect the spark plugs Click here.

      Tech Tips

      Even if the spark plug of only one cylinder is malfunctioning, replace the spark plugs of all cylinders.


    NG

    REPLACE SPARK PLUG Click here

    OK

  42. READ VALUE USING INTELLIGENT TESTER (ENGINE SPEED)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine / Data List / Engine Speed.

    5. Start the engine.

    6. While running the engine, read the Engine Speed value.

      Standard
      A value that matches the actual engine speed is constantly output.

      Tech Tips


      • Check the engine speed using a line graph.

      • If the engine cannot be started, check the engine speed while cranking the engine.

      • If the engine speed is 0 rpm, the crankshaft position sensor may have an open or short circuit.


    NG

    CHECK CRANKSHAFT POSITION SENSOR CIRCUIT Click here

    OK

  43. CHECK HARNESS AND CONNECTOR (IGNITION COIL POWER SOURCE)


    1. Disconnect the ignition coil connector.

    2. Turn the engine switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E22-1 (+B) - E22-4 (GND) Engine switch on (IG) 11 to 14 V
      E32-1 (+B) - E32-4 (GND) Engine switch on (IG) 11 to 14 V
      E23-1 (+B) - E23-4 (GND) Engine switch on (IG) 11 to 14 V
      E33-1 (+B) - E33-4 (GND) Engine switch on (IG) 11 to 14 V
      E24-1 (+B) - E24-4 (GND) Engine switch on (IG) 11 to 14 V
      E35-1 (+B) - E35-4 (GND) Engine switch on (IG) 11 to 14 V
      E78-1 (+B) - E78-4 (GND) Engine switch on (IG) 11 to 14 V
      E72-1 (+B) - E72-4 (GND) Engine switch on (IG) 11 to 14 V

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

    4. Reconnect the ignition coil connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION COIL - IG2 RELAY)

    OK

  44. CHECK HARNESS AND CONNECTOR (IGNITION COIL - ECM)


    1. Disconnect the ignition coil connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      E22-2 (IGF1) - E5-32 (IGF1) Always Below 1 Ω
      E32-2 (IGF2) - E4-28 (IGF2) Always Below 1 Ω
      E23-2 (IGF2) - E4-28 (IGF2) Always Below 1 Ω
      E33-2 (IGF1) - E5-32 (IGF1) Always Below 1 Ω
      E24-2 (IGF2) - E4-28 (IGF2) Always Below 1 Ω
      E35-2 (IGF1) - E5-32 (IGF1) Always Below 1 Ω
      E78-2 (IGF1) - E5-32 (IGF1) Always Below 1 Ω
      E72-2 (IGF2) - E4-28 (IGF2) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E22-2 (IGF1) or E5-32 (IGF1) - Body ground Always 10 kΩ or higher
      E32-2 (IGF2) or E4-28 (IGF2) - Body ground Always 10 kΩ or higher
      E23-2 (IGF2) or E4-28 (IGF2) - Body ground Always 10 kΩ or higher
      E33-2 (IGF1) or E5-32 (IGF1) - Body ground Always 10 kΩ or higher
      E24-2 (IGF2) or E4-28 (IGF2) - Body ground Always 10 kΩ or higher
      E35-2 (IGF1) or E5-32 (IGF1) - Body ground Always 10 kΩ or higher
      E78-2 (IGF1) or E5-32 (IGF1) - Body ground Always 10 kΩ or higher
      E72-2 (IGF2) or E4-28 (IGF2) - Body ground Always 10 kΩ or higher

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

    4. Reconnect the ECM connector.

    5. Reconnect the ignition coil connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  45. CHECK HARNESS AND CONNECTOR (IGNITION COIL - ECM)


    1. Disconnect the ignition coil connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      E22-3 (IGT1) - E5-27 (IGT1) Always Below 1 Ω
      E32-3 (IGT2) - E4-23 (IGT2) Always Below 1 Ω
      E23-3 (IGT3) - E5-26 (IGT3) Always Below 1 Ω
      E33-3 (IGT4) - E4-22 (IGT4) Always Below 1 Ω
      E24-3 (IGT5) - E5-25 (IGT5) Always Below 1 Ω
      E35-3 (IGT6) - E4-21 (IGT6) Always Below 1 Ω
      E78-3 (IGT7) - E5-24 (IGT7) Always Below 1 Ω
      E72-3 (IGT8) - E4-20 (IGT8) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E22-3 (IGT1) or E5-27 (IGT1) - Body ground Always 10 kΩ or higher
      E32-3 (IGT2) or E4-23 (IGT2) - Body ground Always 10 kΩ or higher
      E23-3 (IGT3) or E5-26 (IGT3) - Body ground Always 10 kΩ or higher
      E33-3 (IGT4) or E4-22 (IGT4) - Body ground Always 10 kΩ or higher
      E24-3 (IGT5) or E5-25 (IGT5) - Body ground Always 10 kΩ or higher
      E35-3 (IGT6) or E4-21 (IGT6) - Body ground Always 10 kΩ or higher
      E78-3 (IGT7) or E5-24 (IGT7) - Body ground Always 10 kΩ or higher
      E72-3 (IGT8) or E4-20 (IGT8) - Body ground Always 10 kΩ or higher

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

      • If the wire harness is normal, after replacing the ignition coil, check if engine starting trouble occurs again. If engine starting trouble occurs again, proceed to step 72 and perform troubleshooting for the ignition system (steps 79 to 88).

    4. Reconnect the ECM connector.

    5. Reconnect the ignition coil connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE IGNITION COIL Click here

  46. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE FUEL PUMP/SPEED)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump/Speed.

    5. When performing the Active Test, check for an operating sound from the fuel pump (for low pressure).

      Standard
      Tester Operation Specified Condition
      ON Operating sound heard
      OFF Operating sound not heard

      Tech Tips

      Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.


    NG

    CHECK FUEL PUMP CONTROL CIRCUIT Click here

    OK

  47. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE FUEL PUMP/SPEED)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump/Speed.

    5. When performing the Active Test, check for fuel leakage from the fuel pipes.

      Result
      Result Proceed to
      Fuel leakage or signs of fuel leakage are present A
      No fuel leakage or signs of fuel leakage B

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • Check if the vehicle ran out of fuel, as engine starting trouble due to running out of fuel is also detected.

      • If there are no fuel leaks, after inspecting the fuel pump (for low pressure) control system, check if engine starting trouble occurs again. If engine starting trouble occurs again, proceed to step 72 and perform fuel system troubleshooting (steps 73 to 78).


    B

    CHECK FUEL PUMP CONTROL CIRCUIT Click here

    A

    REPAIR OR REPLACE FUEL LINE

  48. READ VALUE USING INTELLIGENT TESTER (ENGINE SPEED)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine / Data List / Engine Speed.

    5. Start the engine.

    6. While running the engine, read the Engine Speed value.

      Standard
      A value that matches the actual engine speed is constantly output.

      Tech Tips


      • Check the engine speed using a line graph.

      • If the engine cannot be started, check the engine speed while cranking the engine.

      • If the engine speed is 0 rpm, the crankshaft position sensor may have an open or short circuit.


    NG

    REPLACE CRANKSHAFT POSITION SENSOR Click here

    OK

  49. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR FOR PORT INJECTION POWER SOURCE)


    1. Disconnect the fuel injector for port injection connectors.

    2. Turn the engine switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I9-2 - Ground Engine switch on (IG) 11 to 14 V
      I10-2 - Ground Engine switch on (IG) 11 to 14 V
      I11-2 - Ground Engine switch on (IG) 11 to 14 V
      I12-2 - Ground Engine switch on (IG) 11 to 14 V
      H9-2 - Ground Engine switch on (IG) 11 to 14 V
      H10-2 - Ground Engine switch on (IG) 11 to 14 V
      H11-2 - Ground Engine switch on (IG) 11 to 14 V
      H12-2 - Ground Engine switch on (IG) 11 to 14 V

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

    4. Reconnect the fuel injector for port injection connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR FOR PORT INJECTION - IG2 RELAY)

    OK

  50. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR FOR PORT INJECTION - ECM)


    1. Disconnect the fuel injector for port injection connectors.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      I9-1 - E5-17 (#10) Always Below 1 Ω
      H9-1 - E4-11 (#20) Always Below 1 Ω
      I10-1 - E5-16 (#30) Always Below 1 Ω
      H10-1 - E4-10 (#40) Always Below 1 Ω
      I11-1 - E5-15 (#50) Always Below 1 Ω
      H11-1 - E4-9 (#60) Always Below 1 Ω
      I12-1 - E5-14 (#70) Always Below 1 Ω
      H12-1 - E4-8 (#80) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      I9-1 or E5-17 (#10) - Body ground Always 10 kΩ or higher
      H9-1 or E4-11 (#20) - Body ground Always 10 kΩ or higher
      I10-1 or E5-16 (#30) - Body ground Always 10 kΩ or higher
      H10-1 or E4-10 (#40) - Body ground Always 10 kΩ or higher
      I11-1 or E5-15 (#50) - Body ground Always 10 kΩ or higher
      H11-1 or E4-9 (#60) - Body ground Always 10 kΩ or higher
      I12-1 or E5-14 (#70) - Body ground Always 10 kΩ or higher
      H12-1 or E4-8 (#80) - Body ground Always 10 kΩ or higher

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

    4. Reconnect the ECM connector.

    5. Reconnect the fuel injector for port injection connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here

  51. INSPECT MASS AIR FLOW METER


    1. Inspect the mass air flow meter Click here.


    NG

    CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM) Click here

    OK

  52. CHECK INTAKE SYSTEM


    1. Check for air suction in the intake system [vacuum hose disconnection, cracks, damaged gaskets, etc.] Click here.

      Tech Tips


      • If the accelerator pedal is released after racing the engine, the inspection is easier to perform because the vacuum inside the intake manifold increases and the air suction noise becomes louder.

      • If Short FT and Long FT are largely different from the normal values when idling (intake air volume is small) and almost the same as the normal values when racing the engine (intake air volume is high), air leakage may be present.

      Standard
      There is no air suction.

    NG

    REPAIR OR REPLACE INTAKE SYSTEM

    OK

  53. CHECK THROTTLE BODY ASSEMBLY


    1. Disconnect the throttle body connector.

      Tech Tips

      When the connector is disconnected, the vehicle enters fail-safe mode and the throttle valve opening angle is 4 to 7°.

    2. Crank the engine and check that it starts.

      Result
      Result Proceed to
      Engine starts A
      Engine does not start B

    3. Connect the throttle body connector.

      Tech Tips

      When this inspection is performed, the MIL may illuminate. After finishing the inspection, check and clear DTCs Click here.


    B

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE VVT-IE LINEAR) Click here

    A

  54. CHECK THROTTLE BODY ASSEMBLY


    1. Check if carbon is in the air flow passage.

      Standard
      No carbon present.

    NG

    REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY ASSEMBLY

    OK

  55. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE VVT-IE LINEAR)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Start the engine and warm it up.

    5. Enter the following menus: Powertrain / Engine / Active Test / Control the VVT-iE Linear (Bank 1) or Control the VVT-iE Linear (Bank 2).

    6. Monitor VVT-iE Aim Angle #1 and VVT Change Angle #1 or VVT-iE Aim Angle #2 and VVT Change Angle #2.

    7. Perform the Active Test operation with the engine speed at 1500 rpm.

      OK
      Active Test Movement Order Difference between "VVT-iE Aim Angle" and "VVT Change Angle"
      0 deg → 10 deg → 40 deg → 10 deg → 0 deg → 10 deg → END Within 5 DegFR

      Tech Tips


      • When viewed from the rear of the engine assembly, bank 1 is on the left side and bank 2 is on the right side.

      • Juggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.


    NG

    CHECK VVT-IE SYSTEM

    OK

  56. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE VVT EXHAUST LINEAR)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Start the engine and warm it up.

    5. Enter the following menus: Powertrain / Engine / Active Test / Control the VVT Exhaust Linear (Bank 1) or Control the VVT Exhaust Linear (Bank 2).

    6. Check the engine speed while operating the oil control valve using the tester.

      OK*
      Tester Operation Specified Condition
      0% Normal engine speed
      100% Engine idles roughly or stalls
      Result
      Result Proceed to
      NG A
      OK B

      Tech Tips


      • *: From step 72, perform intake system troubleshooting (steps 89 to 91). If engine starting trouble still occurs, perform fuel system troubleshooting A (steps 92 to 99).

      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • When the results of the inspection using the Active Test are normal but the camshaft timing oil control valve operating noise is abnormal, check the camshaft timing oil control valve for any signs of problems.

      • If the camshaft timing oil control valve assembly is stuck on, the valve overlap increases and combustion worsens due to the internal EGR which may cause the engine to stall.


    B

    CHECK MALFUNCTION CONDITION Click here

    A

    REPLACE CAMSHAFT TIMING OIL CONTROL VALVE Click here

  57. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)


    1. Disconnect the mass air flow meter connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      E29-5 (VG) - E3-25 (VG) Always Below 1 Ω
      E29-4 (E2G) - E3-24 (E2G) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E29-5 (VG) or E3-25 (VG) - Body ground Always 10 kΩ or higher

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

      • If the wire harness is normal, after replacing the mass air flow meter, check if engine starting trouble occurs again. If engine starting trouble occurs again, proceed to step 72 and perform intake system troubleshooting (steps 89 to 91). If engine starting trouble still occurs, perform fuel system troubleshooting A (steps 92 to 99).

    4. Reconnect the ECM connector.

    5. Reconnect the mass air flow meter connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MASS AIR FLOW METER Click here

  58. INSPECT ENGINE COOLANT TEMPERATURE SENSOR


    1. Inspect the engine coolant temperature sensor Click here.

      Tech Tips

      If the engine coolant temperature sensor is malfunctioning, after replacing it, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 72 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order.


    NG

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    OK

  59. CHECK HARNESS AND CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - ECM)


    1. Disconnect the engine coolant temperature sensor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      E40-2 - E3-19 (THW) Always Below 1 Ω
      E40-1 - E3-28 (E2) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E40-2 or E3-19 (THW) - Body ground Always 10 kΩ or higher
      E40-1 or E3-28 (E2) - Body ground Always 10 kΩ or higher

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

      • If the wire harness or connector is malfunctioning, after replacing or repairing it, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 72 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order.

    4. Reconnect the ECM connector.

    5. Reconnect the engine coolant temperature sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  60. INSPECT MASS AIR FLOW METER


    1. Inspect the mass air flow meter Click here.

      Tech Tips

      If the mass air flow meter is malfunctioning, after replacing it, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 72 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order.


    NG

    REPLACE MASS AIR FLOW METER Click here

    OK

  61. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)


    1. Disconnect the mass air flow meter connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      E29-5 (VG) - E3-25 (VG) Always Below 1 Ω
      E29-4 (E2G) - E3-24 (E2G) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E29-5 (VG) or E3-25 (VG) - Body ground Always 10 kΩ or higher

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

      • If the wire harness or connector is malfunctioning, after replacing or repairing it, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 72 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order.

    4. Reconnect the ECM connector.

    5. Reconnect the mass air flow meter connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  62. READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine / Data List / Atmosphere Pressure and Long FT #1, #2.

    5. Read the value.

      Result
      Data List Item Result Suspected Area Proceed to
      Long FT #1, #2 +25% or more or less than -25%

      • Air fuel ratio sensor

      • Heated oxygen sensor

      • Mass air flow meter

      • Fuel injector for port injection

      • ECM

      		 A
      Atmosphere Pressure 80 kPa (600 mmHg) or less (when altitude is 0 m)
      Both Data List items listed above Values are other than above - B

    B

    CHECK FUEL PRESSURE (LOW PRESSURE SIDE) Click here

    A

  63. PERFORM SIMULATION TEST


    1. Remove the EFI and ETCS fuses from the engine room relay block.

    2. After 60 seconds or more have elapsed, install the EFI and ETCS fuses.

    3. Check if the engine can be started.

      Result
      Result Proceed to
      Engine can be started A
      Engine cannot be started B

    B

    CHECK FUEL PRESSURE (LOW PRESSURE SIDE) Click here

    A

  64. INSPECT AIR FUEL RATIO SENSOR

    A016091E02

    1. Connect the intelligent tester to the DLC3.

    2. Start the engine.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine / Data List / Fuel System Status #1 and Fuel System Status #2.

    5. Confirm that Fuel System Status #1 and Fuel System Status #2 are both CL.

    6. Enter the following menus: Powertrain / Engine / Data List / AF Lambda B1S1 and AF Lambda B2S1.

    7. Confirm that AF Lambda B1S1 and AF Lambda B2S1 are both within the range of 0.95 to 1.05 when idling.

    8. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor.

    9. Read the output voltage from the air fuel ratio sensor when increasing and decreasing the fuel injection volume.

      Standard
      Tester Display Injection Volume Specified Condition

      AFS Voltage B1S1

      AFS Voltage B2S1

      		 +25% Air fuel ratio sensor output voltage is below 3.1 V
      -12.5% Air fuel ratio sensor output voltage is higher than 3.4 V

      Tech Tips


      • The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.

      • If the air fuel ratio sensor is malfunctioning, after replacing it, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 72 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order.


    NG

    REPLACE AIR FUEL RATIO SENSOR Click here

    OK

  65. PERFORM SIMULATION TEST


    1. Check if the idle speed is stable after starting the engine.

      OK
      Idle speed is stable.

      Tech Tips

      After replacing the fuel injector for port injection or mass air flow meter, check if engine starting trouble occurs again. If engine starting trouble occurs, replace the ECM. If engine starting trouble still occurs, proceed to step 72 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order.


    NG

    REPLACE FUEL INJECTOR FOR PORT INJECTION Click here

    OK

    REPLACE MASS AIR FLOW METER Click here

  66. CHECK FUEL PRESSURE (LOW PRESSURE SIDE)


    1. Inspect the fuel pressure (low pressure side) Click here.


    NG

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE FUEL PUMP/SPEED) Click here

    OK

  67. CHECK SPARK PLUG


    1. Inspect the spark plugs Click here.

      Result
      Result Proceed to
      All cylinders are normal A
      One cylinder is abnormal*1 B
      All cylinders are abnormal*2, *3 C

      Tech Tips


      • *1: If one cylinder is abnormal, replace the spark plug of that cylinder and inspect the ignition and fuel system for that cylinder. After performing repairs, check if engine starting trouble occurs again. If engine starting trouble still occurs, proceed to step 72 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order.

      • *2: If all cylinders are abnormal, replace the spark plugs of all cylinders and check if engine starting trouble occurs again. If engine starting trouble still occurs, proceed to step 72 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order.

      • *3: Engine starting trouble may occur if the vehicle is driven extremely short distances repeatedly.


    B

    REPLACE SPARK PLUG (ABNORMAL CYLINDER) Click here

    C

    REPLACE SPARK PLUG (ALL CYLINDER) Click here

    A

  68. CONFIRM VEHICLE CONDITION


    1. Confirm the conditions present when the malfunction occurred based on the customer problem analysis.

      Result
      Problem Symptom Suspected Area Proceed to
      When the engine is stopped and a long time has passed, engine starting trouble occurs*1 Pressure regulator is stuck open A
      When the engine is stopped and approximately 15 to 120 minutes have passed, engine starting trouble occurs*2 Fuel injector leak B
      When the engine is stopped and approximately 2 to 3 minutes have passed, engine starting trouble occurs*3 Failure to maintain fuel pressure by pressure regulator A
      Condition other than above, or there is an inconsistency in the conditions present when engine starting trouble occurs - C*4

      Tech Tips

      *1: The pressure regulator may be stuck open. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine.

      *2: Fuel may be leaking from a fuel injector for port injection.

      *3: The pressure regulator may not be able to maintain the fuel pressure. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine.

      *4: From step 72, perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order.


    B

    CHECK FUEL INJECTOR FOR PORT INJECTION Click here

    C

    CHECK MALFUNCTION CONDITION Click here

    A

  69. CHECK FUEL PRESSURE (LOW PRESSURE SIDE)

    Tech Tips

    For the fuel pressure inspection, refer to the following procedures Click here.


    1. Attach a fuel pressure gauge and check the fuel pressure after stopping the engine.

      Result
      Result Proceed to

      Less than 147 kPa (1.5 kgf/cm2) (5 minutes after stopping the engine)

      		 A

      147 kPa (1.5 kgf/cm2) or higher (5 minutes after stopping the engine)

      		 B*

      Tech Tips


      • If the engine cannot be started, check the fuel pressure after cranking the engine.

      • *: From step 72, perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order.


    B

    CHECK MALFUNCTION CONDITION Click here

    A

    REPLACE PRESSURE REGULATOR Click here

  70. CHECK FUEL INJECTOR FOR PORT INJECTION


    1. Clean the inside of the surge tank with compressed air.

    2. After stopping the engine, measure the HC concentration inside the surge tank for 15 minutes.

      Result
      Result Proceed to
      400 ppm or higher A
      Less than 400 ppm B*

      Tech Tips


      • If the concentration is 400 ppm or higher, a fuel injector may have a sealing problem.

      • *: From step 72, perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order.


    B

    CHECK MALFUNCTION CONDITION Click here

    A

    REPLACE FUEL INJECTOR FOR PORT INJECTION Click here

  71. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE FUEL PUMP/SPEED)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump/Speed.

    5. When performing the Active Test, check for fuel leakage from the fuel pipes.

      Result
      Result Proceed to
      Fuel leakage or signs of fuel leakage are present A
      No fuel leakage or signs of fuel leakage B

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • Check if the vehicle ran out of fuel, as engine starting trouble due to running out of fuel is also detected.

      • If there are no fuel leaks, after inspecting the fuel pump control system, check if engine starting trouble occurs again. If engine starting trouble still occurs, proceed to step 72 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order.


    B

    CHECK FUEL PUMP CONTROL CIRCUIT Click here

    A

    REPAIR OR REPLACE FUEL LINE

  72. CHECK MALFUNCTION CONDITION


    1. If the malfunction could not be identified during the inspection in steps 38, 39, 40 and 47, perform fuel system troubleshooting C (steps 73 to 78).

      Result
      Performed Step Troubleshooting by System Procedure Proceed to
      Steps 38, 39, 40 and 47 Fuel system troubleshooting C 73 to 78 A

    2. If the malfunction could not be identified during the inspection in step 45, perform ignition system troubleshooting (steps 79 to 88).

      Result
      Performed Step Troubleshooting by System Procedure Proceed to
      Step 45 Ignition system troubleshooting 79 to 88 B

    3. If the malfunction could not be identified during the inspection in steps 55, 56 and 57, perform intake air system troubleshooting (steps 89 to 91). If engine starting trouble still occurs, perform fuel system troubleshooting A (steps 92 to 99).

      Result
      Performed Step Troubleshooting by System Procedure Proceed to
      Step 55, 56 and 57 Intake air system troubleshooting 89 to 91 C
      Fuel system troubleshooting A 92 to 99

    4. If the malfunction could not be identified during the inspection in steps 58, 59, 60, 61, 64, 65, 67, 68, 69, 70 and 71, perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake air system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order.

      Result
      Performed Step Troubleshooting by System Procedure Proceed to
      Steps 58, 59, 60, 61, 64, 65, 67, 68, 69, 70 and 71 Fuel system troubleshooting A 100 to 107 D
      Fuel system troubleshooting B 108 to 110
      Intake air system troubleshooting 111 to 113
      Ignition system troubleshooting 114 to 123

    B

    CHECK CRANKSHAFT POSITION SENSOR Click here

    C

    READ VALUE USING INTELLIGENT TESTER (ISC LEARNING VALUE) Click here

    D

    CHECK FUEL PRESSURE (LOW PRESSURE SIDE) Click here

    A

  73. INSPECT FUEL INJECTOR FOR PORT INJECTION


    1. Inspect the fuel injectors for port injection Click here.


    NG

    REPLACE FUEL INJECTOR FOR PORT INJECTION Click here

    OK

  74. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR FOR PORT INJECTION POWER SOURCE)


    1. Disconnect the fuel injector for port injection connectors.

    2. Turn the engine switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I9-2 - Ground Engine switch on (IG) 11 to 14 V
      I10-2 - Ground Engine switch on (IG) 11 to 14 V
      I11-2 - Ground Engine switch on (IG) 11 to 14 V
      I12-2 - Ground Engine switch on (IG) 11 to 14 V
      H9-2 - Ground Engine switch on (IG) 11 to 14 V
      H10-2 - Ground Engine switch on (IG) 11 to 14 V
      H11-2 - Ground Engine switch on (IG) 11 to 14 V
      H12-2 - Ground Engine switch on (IG) 11 to 14 V

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

    4. Reconnect the fuel injector for port injection connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR FOR PORT INJECTION - IG2 RELAY)

    OK

  75. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR FOR PORT INJECTION - ECM)


    1. Disconnect the fuel injector for port injection connectors.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      I9-1 - E5-17 (#10) Always Below 1 Ω
      H9-1 - E4-11 (#20) Always Below 1 Ω
      I10-1 - E5-16 (#30) Always Below 1 Ω
      H10-1 - E4-10 (#40) Always Below 1 Ω
      I11-1 - E5-15 (#50) Always Below 1 Ω
      H11-1 - E4-9 (#60) Always Below 1 Ω
      I12-1 - E5-14 (#70) Always Below 1 Ω
      H12-1 - E4-8 (#80) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      I9-1 or E5-17 (#10) - Body ground Always 10 kΩ or higher
      H9-1 or E4-11 (#20) - Body ground Always 10 kΩ or higher
      I10-1 or E5-16 (#30) - Body ground Always 10 kΩ or higher
      H10-1 or E4-10 (#40) - Body ground Always 10 kΩ or higher
      I11-1 or E5-15 (#50) - Body ground Always 10 kΩ or higher
      H11-1 or E4-9 (#60) - Body ground Always 10 kΩ or higher
      I12-1 or E5-14 (#70) - Body ground Always 10 kΩ or higher
      H12-1 or E4-8 (#80) - Body ground Always 10 kΩ or higher

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

    4. Reconnect the ECM connector.

    5. Reconnect the fuel injector for port injection connectors.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  76. REPLACE CRANKSHAFT POSITION SENSOR


    1. Replace the crankshaft position sensor Click here.

    2. Check the engine start operation.

      OK
      Malfunction has been repaired successfully.

    NG

    REPLACE CAMSHAFT POSITION SENSOR Click here

    OK

    END (CRANKSHAFT POSITION SENSOR WAS DEFECTIVE)

  77. REPLACE CAMSHAFT POSITION SENSOR


    1. Replace the camshaft position sensor Click here.

    2. Check the engine start operation.

      OK
      Malfunction has been repaired successfully.

    NG

    REPLACE VVT SENSOR Click here

    OK

    END (CAMSHAFT POSITION SENSOR WAS DEFECTIVE)

  78. REPLACE VVT SENSOR


    1. Replace the VVT sensor Click here.

    2. Check the engine start operation.

      OK
      Malfunction has been repaired successfully.

    NG

    REPLACE ECM Click here

    OK

    END (VVT SENSOR WAS DEFECTIVE)

  79. CHECK CRANKSHAFT POSITION SENSOR


    1. Check the tightening and installation condition of the crankshaft position sensor bolt.

    2. Check the connection of the crankshaft position sensor connector.

      OK
      Sensor is installed correctly.

    NG

    SECURELY REINSTALL CRANKSHAFT POSITION SENSOR Click here

    OK

  80. CHECK CAMSHAFT POSITION SENSOR


    1. Check the tightening and installation condition of the camshaft position sensor bolt.

    2. Check the connection of the camshaft position sensor connector.

      OK
      Sensor is installed correctly.

    NG

    SECURELY REINSTALL CAMSHAFT POSITION SENSOR Click here

    OK

  81. CHECK VVT SENSOR


    1. Check the tightening and installation condition of the VVT sensor bolt.

    2. Check the connection of the VVT sensor connector.

      OK
      Sensor is installed correctly.

    NG

    SECURELY REINSTALL VVT SENSOR Click here

    OK

  82. CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)


    1. Disconnect the crankshaft position sensor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      z4-1 (NE) - E3-27 (NE+) Always Below 1 Ω
      z4-2 (NE-) - E3-34 (NE-) Always Below 1 Ω
      z4-3 (VC) - E3-18 (VC) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      z4-1 (NE) or E3-27 (NE+) - Body ground Always 10 kΩ or higher
      z4-2 (NE-) or E3-34 (NE-) - Body ground Always 10 kΩ or higher
      z4-3 (VC) or E3-18 (VC) - Body ground Always 10 kΩ or higher

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

    4. Reconnect the ECM connector.

    5. Reconnect the crankshaft position sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  83. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)


    1. Disconnect the camshaft position sensor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      E66-1 (G22+) - E4-24 (G2+) Always Below 1 Ω
      E66-2 (G22-) - E4-32 (G2-) Always Below 1 Ω
      E66-3 (VC) - E3-18 (VC) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E66-1 (G22+) or E4-24 (G2+) - Body ground Always 10 kΩ or higher
      E66-2 (G22-) or E4-32 (G2-) - Body ground Always 10 kΩ or higher
      E66-3 (VC) or E3-18 (VC) - Body ground Always 10 kΩ or higher

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

    4. Reconnect the ECM connector.

    5. Reconnect the camshaft position sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  84. CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR INTAKE SIDE - ECM)


    1. Disconnect the VVT sensor for intake side connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      E30-1 (VVL+) - E4-25 (VV1+) Always Below 1 Ω
      E30-2 (VVL-) - E4-33 (VV1-) Always Below 1 Ω
      E30-3 (VC) - E3-18 (VC) Always Below 1 Ω
      E70-1 (VVR+) - E5-19 (VV2+) Always Below 1 Ω
      E70-2 (VVR-) - E5-29 (VV2-) Always Below 1 Ω
      E70-3 (VC) - E3-18 (VC) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E30-1 (VVL+) or E4-25 (VV1+) - Body ground Always 10 kΩ or higher
      E30-2 (VVL-) or E4-33 (VV1-) - Body ground Always 10 kΩ or higher
      E30-3 (VC) or E3-18 (VC) - Body ground Always 10 kΩ or higher
      E70-1 (VVR+) or E5-19 (VV2+) - Body ground Always 10 kΩ or higher
      E70-2 (VVR-) or E5-29 (VV2-) - Body ground Always 10 kΩ or higher
      E70-3 (VC) or E3-18 (VC) - Body ground Always 10 kΩ or higher

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

    4. Reconnect the ECM connector.

    5. Reconnect the VVT sensor for intake side connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  85. CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR EXHAUST SIDE - ECM)


    1. Disconnect the VVT sensor for exhaust side connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      E34-1 (EX+) - E3-26 (EV1+) Always Below 1 Ω
      E34-2 (EX-) - E3-33 (EV1-) Always Below 1 Ω
      E34-3 (VC2) - E3-18 (VC) Always Below 1 Ω
      E25-1 (EX+) - E6-22 (EV2+) Always Below 1 Ω
      E25-2 (EX-) - E6-29 (EV2-) Always Below 1 Ω
      E25-3 (VC2) - E3-18 (VC) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E34-1 (EX+) or E3-26 (EV1+) - Body ground Always 10 kΩ or higher
      E34-2 (EX-) or E3-33 (EV1-) - Body ground Always 10 kΩ or higher
      E34-3 (VC2) or E3-18 (VC) - Body ground Always 10 kΩ or higher
      E25-1 (EX+) or E6-22 (EV2+) - Body ground Always 10 kΩ or higher
      E25-2 (EX-) or E6-29 (EV2-) - Body ground Always 10 kΩ or higher
      E25-3 (VC2) or E3-18 (VC) - Body ground Always 10 kΩ or higher

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunction that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

    4. Reconnect the ECM connector.

    5. Reconnect the VVT sensor for exhaust side connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  86. REPLACE CRANKSHAFT POSITION SENSOR


    1. Replace the crankshaft position sensor Click here.

    2. Check the engine start operation.

      OK
      Malfunction has been repaired successfully.

    NG

    REPLACE CAMSHAFT POSITION SENSOR Click here

    OK

    END (CRANKSHAFT POSITION SENSOR WAS DEFECTIVE)

  87. REPLACE CAMSHAFT POSITION SENSOR


    1. Replace the camshaft position sensor Click here.

    2. Check the engine start operation.

      OK
      Malfunction has been repaired successfully.

    NG

    REPLACE VVT SENSOR Click here

    OK

    END (CAMSHAFT POSITION SENSOR WAS DEFECTIVE)

  88. REPLACE VVT SENSOR


    1. Replace the VVT sensor Click here.

    2. Check the engine start operation.

      OK
      Malfunction has been repaired successfully.

    NG

    REPLACE ECM Click here

    OK

    END (VVT SENSOR WAS DEFECTIVE)

  89. READ VALUE USING INTELLIGENT TESTER (ISC LEARNING VALUE)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine / Data List / ISC Learning Value.

    5. Start the engine and warm it up until the engine coolant temperature stabilizes with the A/C switch and all the accessory switches turned off.

      Result
      Data List Item Result Suspected Area Proceed to
      ISC Learning Value (Engine displacement (liters) x 0.9) or more

      • Valve timing

      • Compression

      		 A
      Less than (engine displacement (liters) x 0.9) - B

    B

    INSPECT ENGINE COOLANT TEMPERATURE SENSOR Click here

    A

  90. CHECK CYLINDER COMPRESSION PRESSURE


    1. Inspect the compression Click here.


    NG

    REPAIR OR REPLACE ENGINE ASSEMBLY

    OK

    CHECK VALVE TIMING Click here

  91. INSPECT ENGINE COOLANT TEMPERATURE SENSOR


    1. Inspect the engine coolant temperature sensor Click here.


    NG

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    OK

  92. CHECK FUEL PRESSURE (LOW PRESSURE SIDE)

    Tech Tips

    For the fuel pressure inspection, refer to the following procedures Click here.


    1. Attach a fuel pressure gauge and check the fuel pressure when cranking the engine and after stopping the engine.

      Result
      Vehicle State Specified Condition
      Cranking engine

      304 to 343 kPa (3.1 to 3.5 kgf/cm2)
      5 minutes after stopping engine

      147 kPa (1.5 kgf/cm2) or more

    NG

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE FUEL PUMP/SPEED) Click here

    OK

  93. READ VALUE USING INTELLIGENT TESTER (LONG FT #1 AND LONG FT #2)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine / Data List / Long FT #1 and Long FT #2.

      Result
      Data List Item Result Suspected Area Proceed to
      Long FT #1 and Long FT #2 -15 to +15%

      • Wire harness or connector

      • Fuel

      		 A
      +15% or more, or less than -15% Fuel injector for port injection B

    B

    REPLACE FUEL INJECTOR FOR PORT INJECTION Click here

    A

  94. PERFORM SIMULATION TEST


    1. Check if the idle speed after starting the engine is currently stable and has always been stable in the past.

      Result
      Problem Symptom Suspected Area Proceed to
      Current unstable idle speed or history of unstable idle speed Crankshaft position sensor system A
      All current and past idling speeds are stable Fuel B

      Tech Tips

      Through the customer problem analysis, confirm the fuel being used and the location at which the fuel was added to check if the malfunction is caused by the fuel in the vehicle.


    B

    REPLACE FUEL

    A

  95. CHECK CRANKSHAFT POSITION SENSOR


    1. Check the tightening and installation condition of the crankshaft position sensor bolt.

    2. Check the connection of the crankshaft position sensor connector.

      OK
      Sensor is installed correctly.

    NG

    SECURELY REINSTALL CRANKSHAFT POSITION SENSOR Click here

    OK

  96. CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)


    1. Disconnect the crankshaft position sensor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      z4-1 (NE) - E3-27 (NE+) Always Below 1 Ω
      z4-2 (NE-) - E3-34 (NE-) Always Below 1 Ω
      z4-3 (VC) - E3-18 (VC) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      z4-1 (NE) or E3-27 (NE+) - Body ground Always 10 kΩ or higher
      z4-2 (NE-) or E3-34 (NE-) - Body ground Always 10 kΩ or higher
      z4-3 (VC) or E3-18 (VC) - Body ground Always 10 kΩ or higher

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

    4. Reconnect the ECM connector.

    5. Reconnect the crankshaft position sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  97. REPLACE CRANKSHAFT POSITION SENSOR


    1. Replace the crankshaft position sensor Click here.

    2. Check the engine start operation.

      OK
      Malfunction has been repaired successfully.

    NG

    REPLACE ECM Click here

    OK

    END (CRANKSHAFT POSITION SENSOR WAS DEFECTIVE)

  98. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE FUEL PUMP/SPEED)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump/Speed.

    5. When performing the Active Test, check for fuel leakage from the fuel pipes.

      Result
      Result Proceed to
      Fuel leakage or signs of fuel leakage are present A
      No fuel leakage or signs of fuel leakage B

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • When performing the Active Test, if there is no operating noise from the fuel pump, the fuel pump system may be malfunctioning.

      • Check if the vehicle ran out of fuel, as engine starting trouble due to running out of fuel is also detected.


    B

    INSPECT FUEL PUMP (FOR LOW PRESSURE) Click here

    A

    REPAIR OR REPLACE FUEL LINE

  99. INSPECT FUEL PUMP (FOR LOW PRESSURE)


    1. Disconnect the fuel pump (for low pressure) connector.

    2. A016186E04

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      4 - 5 20°C (68°F) 0.2 to 3.0 Ω

      Tech Tips


      • Make sure there is no foreign matter such as iron particles on the fuel pump (for low pressure) and no signs that the fuel pump (for low pressure) was stuck.

      • Make sure the internal connector is securely connected.

      • Make sure the fuel pump filter is not clogged.

    3. Reconnect the fuel pump (for low pressure) connector.


    NG

    REPLACE FUEL PUMP (FOR LOW PRESSURE) Click here

    OK

    REPLACE PRESSURE REGULATOR Click here

  100. CHECK FUEL PRESSURE (LOW PRESSURE SIDE)

    Tech Tips

    For the fuel pressure inspection, refer to the following procedures Click here.


    1. Attach a fuel pressure gauge and check the fuel pressure after stopping the engine.

      Result
      Result Proceed to

      147 kPa (1.5 kgf/cm2) or higher (5 minutes after stopping the engine)

      		 A

      Less than 147 kPa (1.5 kgf/cm2) (5 minutes after stopping the engine)

      		 B

    B

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE FUEL PUMP/SPEED) Click here

    A

  101. READ VALUE USING INTELLIGENT TESTER (LONG FT #1 AND LONG FT #2)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine / Data List / Long FT #1 and Long FT #2.

      Result
      Data List Item Result Suspected Area Proceed to
      Long FT #1 and Long FT #2 -15 to +15%

      • Wire harness or connector

      • Fuel

      		 A
      +15% or more, or less than -15% Fuel injector for port injection B

    B

    REPLACE FUEL INJECTOR FOR PORT INJECTION Click here

    A

  102. PERFORM SIMULATION TEST


    1. Check if the idle speed after starting the engine is currently stable and has always been stable in the past.

      Result
      Problem Symptom Suspected Area Proceed to
      Current unstable idle speed or history of unstable idle speed Crankshaft position sensor system A
      All current and past idling speeds are stable Fuel B

      Tech Tips

      Through the customer problem analysis, confirm the fuel being used and the location at which the fuel was added to check if the malfunction is caused by the fuel in the vehicle.


    B

    REPLACE FUEL

    A

  103. CHECK CRANKSHAFT POSITION SENSOR


    1. Check the tightening and installation condition of the crankshaft position sensor bolt.

    2. Check the connection of the crankshaft position sensor connector.

      OK
      Sensor is installed correctly.

    NG

    SECURELY REINSTALL CRANKSHAFT POSITION SENSOR Click here

    OK

  104. CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)


    1. Disconnect the crankshaft position sensor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      z4-1 (NE) - E3-27 (NE+) Always Below 1 Ω
      z4-2 (NE-) - E3-34 (NE-) Always Below 1 Ω
      z4-3 (VC) - E3-18 (VC) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      z4-1 (NE) or E3-27 (NE+) - Body ground Always 10 kΩ or higher
      z4-2 (NE-) or E3-34 (NE-) - Body ground Always 10 kΩ or higher
      z4-3 (VC) or E3-18 (VC) - Body ground Always 10 kΩ or higher

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

    4. Reconnect the ECM connector.

    5. Reconnect the crankshaft position sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  105. REPLACE CRANKSHAFT POSITION SENSOR


    1. Replace the crankshaft position sensor Click here.

    2. Check the engine start operation.

      OK
      Malfunction has been repaired successfully.

    NG

    REPLACE ECM Click here

    OK

    END (CRANKSHAFT POSITION SENSOR WAS DEFECTIVE)

  106. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE FUEL PUMP/SPEED)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump/Speed.

    5. When performing the Active Test, check for fuel leakage from the fuel pipes.

      Result
      Result Proceed to
      Fuel leakage or signs of fuel leakage are present A
      No fuel leakage or signs of fuel leakage B

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • When performing the Active Test, if there is no operating noise from the fuel pump, the fuel pump system may be malfunctioning.

      • Check if the vehicle ran out of fuel, as engine starting trouble due to running out of fuel is also detected.


    B

    INSPECT FUEL PUMP (FOR LOW PRESSURE) Click here

    A

    REPAIR OR REPLACE FUEL LINE

  107. INSPECT FUEL PUMP (FOR LOW PRESSURE)


    1. Disconnect the fuel pump (for low pressure) connector.

    2. A016186E04

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      4 - 5 20°C (68°F) 0.2 to 3.0 Ω

      Tech Tips


      • Make sure there is no foreign matter such as iron particles on the fuel pump (for low pressure) and no signs that the fuel pump (for low pressure) was stuck.

      • Make sure the internal connector is securely connected.

      • Make sure the fuel pump filter is not clogged.

    3. Reconnect the fuel pump (for low pressure) connector.


    NG

    REPLACE FUEL PUMP (FOR LOW PRESSURE) Click here

    OK

  108. CHECK PURGE VSV


    1. A0162V3

      Disconnect the vacuum hose (on the canister side) of the purge VSV.

    2. Start the engine.

    3. Idle the engine.

    4. Disconnect the purge VSV connector.

    5. Check if air flows through the purge VSV.

      Standard
      Air does not flow.

    6. Reconnect the purge VSV connector.

    7. Reconnect the vacuum hose.

      Tech Tips

      When this inspection is performed, the MIL may illuminate. After finishing the inspection, check and clear DTCs Click here.


    NG

    INSPECT PURGE VSV Click here

    OK

  109. CHECK FUEL INJECTOR FOR PORT INJECTION


    1. Clean the inside of the surge tank with compressed air.

    2. After stopping the engine, measure the HC concentration inside the surge tank for 15 minutes.

      Result
      Result Proceed to
      400 ppm or higher A
      Less than 400 ppm B

      Tech Tips

      If the concentration is 400 ppm or higher, a fuel injector may have a sealing problem.


    B

    CHECK INTAKE VALVE Click here

    A

    REPLACE FUEL INJECTOR FOR PORT INJECTION Click here

  110. CHECK INTAKE VALVE


    1. Check if carbon is on the intake valves.

      Result
      Result Proceed to
      Carbon present A
      No carbon present B

    B

    READ VALUE USING INTELLIGENT TESTER (ISC LEARNING VALUE) Click here

    A

    CLEAN INTAKE VALVE

  111. READ VALUE USING INTELLIGENT TESTER (ISC LEARNING VALUE)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine / Data List / ISC Learning Value.

    5. Start the engine, turn off all accessory switches and warm up the engine until the engine coolant temperature stabilizes.

      Result
      Data List Item Result Suspected Area Proceed to
      ISC Learning Value (Engine displacement (liters) x 0.9) or more

      • Valve timing

      • Compression

      		 A
      Less than (engine displacement (liters) x 0.9) - B

    B

    INSPECT ENGINE COOLANT TEMPERATURE SENSOR Click here

    A

  112. CHECK CYLINDER COMPRESSION PRESSURE


    1. Inspect the compression Click here.


    NG

    REPAIR OR REPLACE ENGINE ASSEMBLY

    OK

    ADJUST VALVE TIMING Click here

  113. INSPECT ENGINE COOLANT TEMPERATURE SENSOR


    1. Inspect the engine coolant temperature sensor Click here.


    NG

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    OK

  114. CHECK CRANKSHAFT POSITION SENSOR


    1. Check the tightening and installation condition of the crankshaft position sensor bolt.

    2. Check the connection of the crankshaft position sensor connector.

      OK
      Sensor is installed correctly.

    NG

    SECURELY REINSTALL CRANKSHAFT POSITION SENSOR Click here

    OK

  115. CHECK CAMSHAFT POSITION SENSOR


    1. Check the tightening and installation condition of the camshaft position sensor bolt.

    2. Check the connection of the camshaft position sensor connector.

      OK
      Sensor is installed correctly.

    NG

    SECURELY REINSTALL CAMSHAFT POSITION SENSOR Click here

    OK

  116. CHECK VVT SENSOR


    1. Check the tightening and installation condition of the VVT sensor bolt.

    2. Check the connection of the VVT sensor connector.

      OK
      Sensor is installed correctly.

    NG

    SECURELY REINSTALL VVT SENSOR Click here

    OK

  117. CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)


    1. Disconnect the crankshaft position sensor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      z4-1 (NE) - E3-27 (NE+) Always Below 1 Ω
      z4-2 (NE-) - E3-34 (NE-) Always Below 1 Ω
      z4-3 (VC) - E3-18 (VC) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      z4-1 (NE) or E3-27 (NE+) - Body ground Always 10 kΩ or higher
      z4-2 (NE-) or E3-34 (NE-) - Body ground Always 10 kΩ or higher
      z4-3 (VC) or E3-18 (VC) - Body ground Always 10 kΩ or higher

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

    4. Reconnect the ECM connector.

    5. Reconnect the crankshaft position sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  118. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR - ECM)


    1. Disconnect the camshaft position sensor connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      E66-1 (G22+) - E4-24 (G2+) Always Below 1 Ω
      E66-2 (G22-) - E4-32 (G2-) Always Below 1 Ω
      E66-3 (VC) - E3-18 (VC) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E66-1 (G22+) or E4-24 (G2+) - Body ground Always 10 kΩ or higher
      E66-2 (G22-) or E4-32 (G2-) - Body ground Always 10 kΩ or higher
      E66-3 (VC) or E3-18 (VC) - Body ground Always 10 kΩ or higher

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

    4. Reconnect the ECM connector.

    5. Reconnect the camshaft position sensor connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  119. CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR INTAKE SIDE - ECM)


    1. Disconnect the VVT sensor for intake side connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      E30-1 (VVL+) - E4-25 (VV1+) Always Below 1 Ω
      E30-2 (VVL-) - E4-33 (VV1-) Always Below 1 Ω
      E30-3 (VC) - E3-18 (VC) Always Below 1 Ω
      E70-1 (VVR+) - E5-19 (VV2+) Always Below 1 Ω
      E70-2 (VVR-) - E5-29 (VV2-) Always Below 1 Ω
      E70-3 (VC) - E3-18 (VC) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E30-1 (VVL+) or E4-25 (VV1+) - Body ground Always 10 kΩ or higher
      E30-2 (VVL-) or E4-33 (VV1-) - Body ground Always 10 kΩ or higher
      E30-3 (VC) or E3-18 (VC) - Body ground Always 10 kΩ or higher
      E70-1 (VVR+) or E5-19 (VV2+) - Body ground Always 10 kΩ or higher
      E70-2 (VVR-) or E5-29 (VV2-) - Body ground Always 10 kΩ or higher
      E70-3 (VC) or E3-18 (VC) - Body ground Always 10 kΩ or higher

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunction that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

    4. Reconnect the ECM connector.

    5. Reconnect the VVT sensor for intake side connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  120. CHECK HARNESS AND CONNECTOR (VVT SENSOR FOR EXHAUST SIDE - ECM)


    1. Disconnect the VVT sensor for exhaust side connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      E34-1 (EX+) - E3-26 (EV1+) Always Below 1 Ω
      E34-2 (EX-) - E3-33 (EV1-) Always Below 1 Ω
      E34-3 (VC2) - E3-18 (VC) Always Below 1 Ω
      E25-1 (EX+) - E6-22 (EV2+) Always Below 1 Ω
      E25-2 (EX-) - E6-29 (EV2-) Always Below 1 Ω
      E25-3 (VC2) - E3-18 (VC) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E34-1 (EX+) or E3-26 (EV1+) - Body ground Always 10 kΩ or higher
      E34-2 (EX-) or E3-33 (EV1-) - Body ground Always 10 kΩ or higher
      E34-3 (VC2) or E3-18 (VC) - Body ground Always 10 kΩ or higher
      E25-1 (EX+) or E6-22 (EV2+) - Body ground Always 10 kΩ or higher
      E25-2 (EX-) or E6-29 (EV2-) - Body ground Always 10 kΩ or higher
      E25-3 (VC2) or E3-18 (VC) - Body ground Always 10 kΩ or higher

      Tech Tips


      • Jiggle the wire harness and connector to increase the likelihood of detecting malfunction that do not always occur.

      • Make sure there is not an excessive amount of force applied to the wire harness.

    4. Reconnect the ECM connector.

    5. Reconnect the VVT sensor for exhaust side connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  121. REPLACE CRANKSHAFT POSITION SENSOR


    1. Replace the crankshaft position sensor Click here.

    2. Check the engine start operation.

      OK
      Malfunction has been repaired successfully.

    NG

    REPLACE CAMSHAFT POSITION SENSOR Click here

    OK

    END (CRANKSHAFT POSITION SENSOR WAS DEFECTIVE)

  122. REPLACE CAMSHAFT POSITION SENSOR


    1. Replace the camshaft position sensor Click here.

    2. Check the engine start operation.

      OK
      Malfunction has been repaired successfully.

    NG

    REPLACE VVT SENSOR Click here

    OK

    END (CAMSHAFT POSITION SENSOR WAS DEFECTIVE)

  123. REPLACE VVT SENSOR


    1. Replace the VVT sensor Click here.

    2. Check the engine start operation.

      OK
      Malfunction has been repaired successfully.

    NG

    REPLACE ECM Click here

    OK

    END (VVT SENSOR WAS DEFECTIVE)