SFI SYSTEM Engine Stalls

DTC Code DTC Name
Engine Stalls

DESCRIPTION

Problem Symptom

Suspected Area

Trouble Area

  • Engine speed fluctuation due to abnormal combustion

  • Idle speed too low or high

Strong engine vibration due to above symptoms

  • Ignition malfunction

  • Deviation in air fuel ratio (Excessive or insufficient intake air volume or fuel supply)

  • Insufficient compression

  • Changes in load from another system

Ignition system

  • Spark plug

  • Ignition coil assembly

Fuel system

  • Fuel injector assembly

  • Fuel pump (for high pressure side)

  • Fuel pump (for low pressure side)

  • Fuel pump control circuit

  • Fuel line

  • Purge VSV system

  • Fuel quality (existence of foreign matter, degradation)

Intake and exhaust systems

  • Mass air flow meter sub-assembly

  • Intake system

    (Air leaks or deposit accumulation)

  • Throttle body with motor assembly

  • Air fuel ratio sensor

  • Heated oxygen sensor

  • Cam timing oil control solenoid assembly

  • Variable Valve Timing system (VVT-iW system)

Other control systems

  • ECM

  • Wire harness or connector

  • Knock control sensor

  • Engine coolant temperature sensor

Engine

  • Thermostat

  • Engine assembly

  • Engine mount

High load from another system

  • Air conditioning system

  • Power steering system

  • Electrical load signal system

  • CVT system
Tip:

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

  • Make sure to reproduce the conditions present when the malfunction occurred.

  • Using the GTS, read the Data List to confirm the engine operating conditions. This information can be useful when troubleshooting.

  • If the problem symptoms do not recur, attempt to reproduce the symptoms and conditions when the malfunction occurred based on the result of the customer problem analysis. Place the priority on confirming the symptoms.

  1. SYMPTOM AND CAUSE OF SYSTEM MALFUNCTION

    Tip:

    The following are descriptions of the characteristics of each system malfunction. After understanding the link between the causes and symptoms, perform the inspection of each component. Even if the problem symptom does not recur, signs of the malfunction may be found in the Data List.

    1. Ignition system

      Table 1. Spark plug

      Main cause of malfunction

      Performance degradation (wear, existence of foreign matter, etc.)

      Symptom

      Engine speed fluctuation due to abnormal combustion

      Data List

      Misfire Count Cylinder #1 to #4
      Tip:

      If the spark plug of the malfunctioning cylinder is abnormally wet with fuel, a leaking fuel injector assembly is suspected.
      Table 2. Ignition coil assembly

      Main cause of malfunction

      Internal malfunction

      Problem symptom

      Engine speed fluctuation due to abnormal combustion

      Data List

      Misfire Count Cylinder #1 to #4

    2. Fuel system

      Table 3. Fuel injector assembly

      Main cause of malfunction

      Blockage

      Problem symptom

      • Engine speed fluctuation due to abnormal combustion

      • Idle speed too low or high

      Data List

      • Short FT Bank 1

      • Long FT Bank 1

      • Fuel System Status Bank 1

      • Target Air-Fuel Ratio

      • A/F (O2) Lambda Sensor B1S1

      • A/F Learn Value Idle Bank 1

      • A/F Learn Value Low Bank 1

      • A/F Learn Value Mid No.1 Bank 1

      • A/F Learn Value Mid No.2 Bank 1

      • A/F Learn Value High Bank 1

      • Total FT Bank 1
      Tip:

      If the engine malfunction disappears when the fuel injection volume is increased or decreased using the Control the Injection Volume or Control the Injection Volume for A/F Sensor, the respective cylinder may be malfunctioning.
      Table 4. Purge VSV

      Main cause of malfunction

      Purge VSV stuck open

      Symptom

      Engine speed fluctuation due to abnormal combustion

      Data List

      • EVAP (Purge) VSV

      • Evap Purge Flow

      • EVAP Purge Density Learn Value

      • EVAP Purge VSV

      • Purge Cut VSV Duty
      Table 5. Fuel system
      Tip:

      If the air fuel ratio becomes lean only when the engine is running under a high load and at a high engine speed, clogging of the fuel pump or fuel filter is suspected.
      Table 6. Fuel quality

      Main cause of malfunction

      • Fuel degradation due to age or water contamination

      • Low fuel quality

      • Addition of fuel additive

      Problem symptom

      • Engine speed fluctuation due to abnormal combustion

      • Idle speed too low or high

      • Engine is difficult to start

    3. Intake and exhaust systems

      Table 7. Mass air flow meter sub-assembly

      Main cause of malfunction

      Performance degradation (existence of foreign matter, etc.)

      Problem symptom

      Lack of power

      Data List

      Mass Air Flow Sensor
      Tip:

      If the value of the Data List item "Mass Air Flow Sensor" is abnormal, a malfunction of the mass air flow meter sub-assembly is suspected.
      Table 8. Throttle system

      Main cause of malfunction

      Inappropriate trim volume adjustment due to accumulation of deposits

      Problem symptom

      • Engine speed fluctuation due to abnormal combustion

      • Idle speed too low or high

      Data List

      • ISC F/B Learn Torque

      • ISC Total AUXS Torque

      • ISC F/B Torque

      • Sum of ISC F/B Torque (Recent)

      • ISC AUXS Torque (Alternator)

      • ISC AUXS Torque (Air Conditioner)

      • Throttle Air Flow F/B Value
      Table 9. Air fuel ratio sensor, Heated oxygen sensor

      Main cause of malfunction

      Deviation in sensor characteristics

      Problem symptom

      Abnormal combustion due to deviation of actual air fuel ratio from calculated ratio

      Data List

      • A/F (O2) Sensor Voltage B1S1

      • O2 Sensor Voltage B1S2

      • Fuel System Status Bank 1

    4. Engine

      Table 10. Engine assembly

      Main cause of malfunction

      • Compression loss

      • Accumulation of deposits

        (Combustion chamber, intake valve or intake manifold)

      Problem symptom

      • Engine speed fluctuation due to abnormal combustion

      • Idle speed too low or high

      • Hesitation during acceleration or stalling
      Tip:

      • If deposits have accumulated in the combustion chamber or on an intake valve, the engine may stall when deposits are caught on an intake valve.

      • When performing the Active Test "Check the Cylinder Compression", if the speed of one cylinder is higher than the others, the cylinder may have a compression loss.

      • If deposits accumulate on the intake valves, the supply of fuel may be delayed due to adherence of the fuel to the deposits, causing a rough idle.
      Table 11. VVT

      Main cause of malfunction

      Camshaft timing oil control valve assembly stuck open

      Symptom

      Abnormal combustion due to excessive valve overlap

      Data List

      • VVT Advance Fail

      • Intake VVT Hold Correct Learn Value Bank 1 (Area 1)

      • Intake VVT Hold Correct Learn Value Bank 1 (Area 2)

      • Intake VVT Change Angle Bank 1

      • Intake VVT OCV Control Duty Ratio Bank 1

      • Exhaust VVT Hold Learn Value Bank 1

      • Exhaust VVT Change Angle Bank 1

      • Exhaust VVT OCV Control Duty Ratio Bank 1

      • Intake VVT Target Angle Bank 1

      • Exhaust VVT Target Angle Bank 1

    5. CVT system

      Table 12. CVT

      Main cause of malfunction

      Shift solenoid valve SLU stuck on

      Symptom

      Engine speed drops or rough idle occurs due to delay in lock-up OFF operation

      Data List

      • Shift SW Status (D Range)

      • Engine Speed

      • NT Sensor Speed

      • Neutral Control
      Tip:

      If the rough idling occurs during neutral control under idling, CVT system is suspected.

  2. Data List Items Related to Engine Stalls

    Tip:

    Depending on the vehicle model, the applicable Data List items may vary. Data List items other than the ones used in the diagnostic procedure are for reference only.

    • ISC F/B Learn Torque

    • ISC Total AUXS Torque

    • ISC F/B Torque

    • Sum of ISC F/B Torque (Recent)

    • ISC AUXS Torque (Alternator)

    • ISC AUXS Torque (Air Conditioner)

    • Throttle Air Flow F/B Value

    • Short FT Bank 1

    • Long FT Bank 1

    • Fuel System Status Bank 1

    • Target Air-Fuel Ratio

    • A/F (O2) Lambda Sensor B1S1

    • A/F Learn Value Idle Bank 1

    • A/F Learn Value Low Bank 1

    • A/F Learn Value Mid No.1 Bank 1

    • A/F Learn Value Mid No.2 Bank 1

    • A/F Learn Value High Bank 1

    • Total FT Bank 1

    • Fuel Pressure (High)

    • High Pressure Fuel Pump Duty Ratio (D4)

    • Target Fuel Pressure (High)

    • High Pressure Fuel Pump Discharge Rate

    • Mass Air Flow Sensor

    • Misfire Count Cylinder #1 to #4

    • A/F (O2) Sensor Voltage B1S1

    • O2 Sensor Voltage B1S2

    • VVT Advance Fail

    • Intake VVT Hold Correct Learn Value Bank 1 (Area 1)

    • Intake VVT Hold Correct Learn Value Bank 1 (Area 2)

    • Intake VVT Change Angle Bank 1

    • Intake VVT OCV Control Duty Ratio Bank 1

    • Exhaust VVT Hold Learn Value Bank 1

    • Exhaust VVT Change Angle Bank 1

    • Exhaust VVT OCV Control Duty Ratio Bank 1

    • Intake VVT Target Angle Bank 1

    • Exhaust VVT Target Angle Bank 1

PROCEDURE

  1. INTERVIEW THE CUSTOMER

    1. Interview the customer for details about the conditions when the engine stalled.

      Tip:

      • Use any information from the customer problem analysis about the conditions of the vehicle when the malfunction occurred (how the engine stalled, conditions when the engine was restarted, etc.)

      • Depending on the conditions when the engine stalled, a malfunction in one of the following areas is suspected.

        Symptom

        Suspected Area

        Engine vibration occurs and engine stalls

        • Abnormal mass air flow meter sub-assembly output due to existence of foreign matter

        • Abnormal air fuel ratio due to malfunction of air fuel ratio sensor or heated oxygen sensor, air leaks in intake system or insufficient fuel supply

        Engine stalls without vibration

        Ignition stoppage, fuel injection stoppage or high load from another system

        Engine can be started with accelerator pedal depressed

        Insufficient air volume

        Engine stalls or is difficult to start immediately after engine stalled, regardless of whether engine is cold or warm

        Deposits in intake system or combustion chamber caught temporarily on intake or exhaust valve

    Result

    Proceed to

    NEXT
    NEXT

  2. CHECK DTC OUTPUT

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Perform a road test.

    5. Enter the following menus: Powertrain / Engine / Trouble Codes.

    6. Read the DTCs.

      Powertrain > Engine > Trouble Codes

    Result

    Result

    Proceed to

    DTCs are not output

    A

    DTC is output

    (DTCs other than P160300, P160400 or P160500 are output)

    B
    B

    GO TO DTC CHART

    Click hereClick here

    A

  3. SYMPTOM CONFIRMATION

    1. Check if the problem symptoms reported in the customer problem analysis recur.

      Tip:

      If the problem symptoms do not recur, attempt to reproduce the conditions when the malfunction occurred based on the result of the customer problem analysis.

    Result

    Result

    Proceed to

    The problem symptom recurs

    A

    The problem symptom does not recur (occurred in the past)

    B
    B

    CHECK FOR INTERMITTENT PROBLEMS

    Click here

    A

  4. READ VALUE USING GTS (ISC F/B LEARN TORQUE)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / ISC F/B Learn Torque.

      Powertrain > Engine > Data List

      Tester Display

      Throttle Air Flow F/B Value

    5. Read the value displayed on the GTS.

    Result

    Result

    Proceed to

    Less than 15 Nm

    A

    Other than above

    B
    B

    REMOVE FOREIGN OBJECT (CLEAN THROTTLE BODY WITH MOTOR ASSEMBLY)Click here

    A

  5. READ VALUE USING GTS (SHORT FT BANK 1 AND LONG FT BANK 1)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

      Powertrain > Engine > Data List

      Tester Display

      Short FT Bank 1

      Long FT Bank 1

    5. Read the value displayed on the GTS.

      Result

      Data List

      Result

      Proceed to

      Short FT Bank 1 + Long FT Bank 1

      -15% or higher, or less than 15%

      A

      Other than above

      B
      Tip:

      • "Total FT Bank 1" is used to detect an abnormal air fuel ratio. As the value of "Total FT Bank 1" is corrected by the ECM before it is displayed in the Data List, the displayed value may not be equal to the sum of the measured "Short FT Bank 1" and "Long FT Bank 1".

      • An abnormally lean or rich tendency can be checked by reading the following Data List items: A/F Learn Value Idle Bank 1, A/F Learn Value Low Bank 1, A/F Learn Value Mid No.1 Bank 1, A/F Learn Value Mid No.2 Bank 1 and A/F Learn Value High Bank 1.

      • The following may cause a lean air fuel ratio (an operating range in which the air fuel ratio learned value correction is +15% or more):

        1. Decrease in fuel injector assembly injection volume

        2. Decrease in mass air flow meter sub-assembly output (due to existence of foreign matter)

        3. Air leaks in intake system after mass air flow meter sub-assembly

        4. Decrease in fuel pressure (at fuel filter, fuel pump or fuel pressure regulator)

      • On vehicles which the learning value for each operating range can be checked, if the value of "A/F Learn Value Idle Bank 1" or "A/F Learn Value Low Bank 1" only is corrected to the positive side, an air leak after the mass air flow meter sub-assembly is suspected.

      • The following may cause a rich air fuel ratio (an operating range in which the air fuel ratio learned value correction is -15% or less):

        1. Increase in the fuel injector assembly injection volume

        2. Purge VSV system

    B

    READ VALUE USING GTS (MASS AIR FLOW SENSOR)Click here

    A

  6. PERFORM ACTIVE TEST USING GTS (CONTROL THE SELECT CYLINDER FUEL CUT)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Start the engine.

      Tip:

      Reproduce the vehicle conditions when the malfunction occurred. (such as after the engine is warmed up or after a cold start).

    5. Enter the following menus: Powertrain / Engine / Active Test / Control the Select Cylinder Fuel Cut / Data List / Engine Speed.

      Powertrain > Engine > Active Test

      Active Test Display

      Control the Select Cylinder Fuel Cut

      Data List Display

      Engine Speed

    6. According to the display on the GTS, perform the Active Test and check for a malfunctioning cylinder.

      Tip:

      • Perform fuel-cut for each cylinder and check the change in the engine speed.

      • If the engine speed of a cylinder does not change while performing the Active Test, it can be determined that the cylinder is malfunctioning.

      • If the engine speed of all cylinders change while performing the Active Test, it can be determined that multiple cylinders are malfunctioning.

      • A cylinder for which the Data List item "Cylinder Misfire Count" increases may be malfunctioning.

      • If "Compression Leakage Count" in the Data List increases, misfiring due to insufficient compression may be occurring.

    Result

    Result

    Proceed to

    One cylinder is malfunctioning

    A

    Multiple or all cylinders are malfunctioning, or the malfunctioning cylinder cannot be determined.

    B
    B

    READ VALUE USING GTS (MASS AIR FLOW SENSOR)Click here

    A

  7. PERFORM ACTIVE TEST USING GTS (CHECK THE CYLINDER COMPRESSION)

    Tip:

    If the vehicle does not support the Active Test "Check the Cylinder Compression", measure the compression pressure. If the compression pressure is normal, go to step 8.

    1. Warm up the engine.

    2. Turn the ignition switch off.

    3. Connect the GTS to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the GTS on.

    6. Enter the following menus: Powertrain / Engine / Active Test / Check the Cylinder Compression / Data List / Compression / Engine Speed Cylinder #1 to #4 and Average Engine Speed of All Cylinder.

      Powertrain > Engine > Active Test

      Active Test Display

      Check the Cylinder Compression

      Data List Display

      Engine Speed Cylinder #1

      Engine Speed Cylinder #2

      Engine Speed Cylinder #3

      Engine Speed Cylinder #4

      Average Engine Speed of All Cylinder
      Tip:

      To display the entire Data List, press the pull down menu button next to Primary. Then select Compression.

    7. While the engine is not running, press the Active button to change Check the Cylinder Compression to "Start".

      Tip:

      After performing the above procedure, Check the Cylinder Compression will start. Fuel injection for all cylinders is prohibited and each cylinder engine speed measurement enters standby mode.

    8. Crank the engine for about 10 seconds.

    9. Monitor the engine speed (Engine Speed Cylinder #1 to #4 and Average Engine Speed of All Cylinder) displayed on the GTS.

      Note:

      • Do not crank the engine continuously for 20 seconds or more.

      • If it is necessary to crank the engine again after Check the Cylinder Compression has been changed to "Start" and the engine has been cranked once, press Exit to return to the Active Test menu screen. Then change Check the Cylinder Compression to "Start" and crank the engine.

      • Use a fully-charged battery.

      Tip:

      • At first, the GTS displays extremely high cylinder engine speed values. After approximately 10 seconds of engine cranking, each cylinder engine speed measurement will change to the actual engine speed.

      • If the cylinder engine speed values (Engine Speed Cylinder #1 to #4) displayed in the Data List do not change from an extremely high value, return to the Active Test menu screen, change "Check the Cylinder Compression" to "Start" and crank the engine again within 1 second.

    10. Stop cranking the engine, and then change "Check the Cylinder Compression" to "Stop" after the engine stops.

      Note:

      • If the Active Test is changed to "Stop" while the engine is being cranked, the engine will start.

      • When performing the Active Test, DTC P160400 (Startability Malfunction) may be stored.

      • After performing the Active Test, make sure to check and clear DTCs.

    11. Read the value.

      Tip:

      • If the value of Data List item "Engine Speed Cylinder" of a cylinder is higher than other cylinders, the cylinder may be malfunctioning.

      • If the value of Data List item "Engine Speed Cylinder" is high for only one cylinder, compression loss is suspected.

    Result

    Result

    Proceed to

    There is no variation in "Engine Speed Cylinder"

    (All cylinders display approximately the same value for "Engine Speed Cylinder")

    A

    There is variation in "Engine Speed Cylinder"

    (Only one cylinder displays a value for "Engine Speed Cylinder" that differs considerably)

    B
    B

    CHECK CYLINDER COMPRESSION PRESSUREClick here

    A

  8. PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Start the engine and warm it up until the engine coolant temperature 75°C (167°F) or higher with all the accessories switched off.

    5. Idle the engine.

    6. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume.

      Powertrain > Engine > Active Test

      Tester Display

      Control the Injection Volume

    7. According to the display on the GTS, perform the Active Test and check the vehicle conditions when increasing and decreasing the fuel injection volume.

      Tip:

      Change the fuel injection volume between the minimum and maximum range of correction (e.g. -12.5% to 12.5%).

    Result

    Result

    Proceed to

    Malfunction is still present even if the fuel injection volume is changed

    A

    Malfunction disappears when the fuel injection volume is changed

    B
    B

    REPLACE FUEL INJECTOR ASSEMBLYClick here

    A

  9. CHECK IGNITION SYSTEM

    1. Check the ignition system.

      Click here

      Tip:

      • Interchange the ignition coil assembly and spark plug of the malfunctioning cylinder with those of a known good cylinder and check if the malfunctioning cylinder returns to normal.

      • If the spark plug of the malfunctioning cylinder is abnormally wet with fuel even after the ignition coil assembly and spark plug are replaced, a leaking fuel injector assembly is suspected.

    Result

    Result

    Proceed to

    The malfunctioning cylinder does not return to normal

    A

    The malfunctioning cylinder returned to normal

    B
    B

    REPAIR OR REPLACE MALFUNCTIONING PARTSClick here

    A

  10. INSPECT OTHER RELATED COMPONENTS

    1. Check the power source circuit, wire harness and connectors.

    Result

    Proceed to

    NEXT
    NEXT

    REPAIR OR REPLACE MALFUNCTIONING PARTSClick here

  11. REMOVE FOREIGN OBJECT (CLEAN THROTTLE BODY WITH MOTOR ASSEMBLY)

    1. Clean off any deposits from the inside of the throttle body with motor assembly.

    2. Push open the throttle valve and wipe off any carbon from the valve and bore using a piece of cloth soaked in non-residue solvent.

      A213929C01

      *1

      Throttle Body with Motor Assembly

      *2

      Bore

      *3

      Valve

      -

      -

      *a

      Reference

      *b

      Throttle Body with Motor Assembly Cross-section Diagram

      *c

      When valve fully opened

      *d

      Do not directly apply cleaner

      *e

      Deposits

      -

      -
    Note:

    • Make sure that the cloth or your fingers do not get caught in the valve.

    • Make sure that foreign matter does not enter the throttle valve.

    • Do not directly apply non-residue solvent to the throttle body with motor assembly or wash the throttle body with motor assembly. Cleaning solvent may leak into the motor from the shaft and cause problems such as rust or valve movement problems.

    • If there is coating material on the edge of the valve, be careful not to remove it.

    Tip:

    The illustrations are for reference only. Actual parts may differ.

    Result

    Proceed to

    NEXT
    NEXT

  12. PERFORM CONFIRMATION DRIVING PATTERN

    1. Perform "Inspection After Repair" after cleaning the throttle body with motor assembly.

      Click here

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

    5. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

    6. Allow the engine to idle for 3 minutes or more and confirm that the engine speed is within the specified range.

      Tip:

      If the engine is operated without performing learning value reset and idle learning after cleaning the deposits from the throttle body with motor assembly, the idle speed may increase.

    Result

    Proceed to

    NEXT
    NEXT

    CONDUCT CONFIRMATION TESTClick here

  13. CHECK CYLINDER COMPRESSION PRESSURE

    1. Measure the cylinder compression pressure. If the compression pressure of a cylinder is low, inspect the engine assembly and repair or replace parts as necessary.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    REPAIR OR REPLACE MALFUNCTIONING PARTSClick here

  14. REPLACE FUEL INJECTOR ASSEMBLY

    1. Replace the abnormal fuel injector assembly.

      Click here

      Tip:

      • If the air fuel ratio learned value is corrected to the positive side for all operating ranges due to low fuel injector assembly injection volume, replace the fuel injector assemblies of all cylinders.

      • Perform "Inspection After Repair" after replacing the fuel injector assembly.

        Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONDUCT CONFIRMATION TESTClick here

  15. READ VALUE USING GTS (MASS AIR FLOW SENSOR)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Start the engine and warm it up until the engine coolant temperature 75°C (167°F) or higher with all the accessories switched off.

    5. Enter the following menus: Powertrain / Engine / Data List / Mass Air Flow Sensor.

      Powertrain > Engine > Data List

      Tester Display

      Mass Air Flow Sensor

    6. According to the display on the GTS, read the Data List when the ignition switch is turned to ON and while maintaining an engine speed of 3000 rpm.

    Result

    Result

    Proceed to

    Other than below

    A

    Ignition switch ON (engine stopped): 0.57 gm/sec or higher

    Engine speed 3000 rpm (without load): Less than 5.7 gm/sec

    B
    B

    CHECK INTAKE SYSTEMClick here

    A

  16. PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Start the engine and warm it up until the engine coolant temperature 75°C (167°F) or higher with all the accessories switched off.

    5. Warm up the air fuel ratio sensor at an engine speed of 2500 rpm for 90 seconds.

    6. Idle the engine.

    7. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / Data List / A/F (O2) Sensor Voltage B1S1 and O2 Sensor Voltage B1S2.

      Powertrain > Engine > Active Test

      Active Test Display

      Control the Injection Volume for A/F Sensor

      Data List Display

      A/F (O2) Sensor Voltage B1S1

      O2 Sensor Voltage B1S2

    8. According to the display on the GTS, perform the Active Test and check the vehicle conditions when increasing and decreasing the fuel injection volume.

      Note:

      • 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.

      • Read the output voltage immediately after warming up the air fuel ratio sensor and heated oxygen sensor to avoid an inaccurate reading due to a sensor cooling.

      Tip:

      The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 12.5%.

      Standard

      GTS Display

      (Sensor)

      Injection Volume

      Voltage

      A/F (O2) Sensor Voltage B1S1

      (Air fuel ratio)

      12.5%

      Below 3.1 V

      -12.5%

      Higher than 3.4 V

      O2 Sensor Voltage B1S2

      (Heated oxygen)

      12.5%

      Higher than 0.55 V

      -12.5%

      Below 0.4 V

    Result

    Result

    Proceed to

    Output voltage values are abnormal

    A

    Malfunction disappears when fuel injection volume is increased

    B

    Malfunction is still present when fuel injection volume is increased, even if output voltage values are normal

    C
    B

    REPLACE FUEL INJECTOR ASSEMBLYClick here

    C

    PERFORM ACTIVE TEST USING GTS (ACTIVATE THE CIRCUIT RELAY)Click here

    A

  17. REPLACE AIR FUEL RATIO SENSOR AND HEATED OXYGEN SENSOR

    1. Replace the air fuel ratio sensor.

      Click here

      Tip:

      Perform "Inspection After Repair" after replacing the air fuel ratio sensor.

      Click here

    2. Replace the heated oxygen sensor.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONDUCT CONFIRMATION TESTClick here

  18. REPLACE FUEL INJECTOR ASSEMBLY

    1. Replace the fuel injector assemblies of all cylinders.

      Click here

      Tip:

      Perform "Inspection After Repair" after replacing the fuel injector assembly.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

    CONDUCT CONFIRMATION TESTClick here

  19. CHECK INTAKE SYSTEM

    1. Check for air leaks or blockage in the intake system components. If a connection problem or foreign matter is found, repair the connection or remove the foreign matter.

      Tip:

      • If there is foreign matter in the intake system components, remove it before proceeding to the next step.

      • If there is no foreign matter in the intake system components, check for foreign matter in the mass air flow meter sub-assembly. If there is foreign matter in the mass air flow meter sub-assembly, remove it.

    Result

    Proceed to

    NEXT
    NEXT

    REPAIR OR REPLACE MALFUNCTIONING PARTSClick here

  20. PERFORM ACTIVE TEST USING GTS (ACTIVATE THE CIRCUIT RELAY)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Active Test / Activate the Circuit Relay.

      Powertrain > Engine > Active Test

      Tester Display

      Activate the Circuit Relay

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

      OK

      Activate the Circuit Relay

      Specified Condition

      ON

      Operating sound heard

      OFF

      Operating sound not heard

    Result

    Proceed to

    OK

    NG
    NG

    INSPECT FUEL PUMP CONTROL SYSTEMClick here

    OK

  21. INSPECT FUEL PUMP (LOW PRESSURE SIDE)

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

      Click here

      Standard

      Vehicle State

      Specified Condition

      Cranking engine

      196 to 588 kPa (2.0 to 6.0 kgf/cm2, 28 to 85 psi)

      5 minutes after stopping engine

      147 kPa (1.5 kgf/cm2, 21 psi) or higher
      Tip:

      • If there is foreign matter such as iron particles on the fuel pump, remove it.

      • Make sure that there are no leaks from the fuel lines, signs of fuel leakage or fuel odors.

    Result

    Result

    Proceed to

    Abnormal

    A

    Normal

    B
    B

    READ VALUE USING GTS (FUEL PRESSURE (HIGH))Click here

    A

  22. INSPECT RELATED PARTS

    1. Inspect the following fuel pump related parts:

      • Fuel pump

      • Fuel pressure regulator

      • Fuel lines and connecting parts

      • Fuel filter

    Result

    Proceed to

    NEXT
    NEXT

    REPAIR OR REPLACE MALFUNCTIONING PARTSClick here

  23. READ VALUE USING GTS (FUEL PRESSURE (HIGH))

    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / Fuel Pressure (High).

      Powertrain > Engine > Data List

      Tester Display

      Fuel Pressure (High)

    5. Read the values.

      Standard

      GTS Display

      Condition

      Specified Condition

      Fuel Pressure (High)

      Shift lever position: P or neutral

      A/C: Off

      Engine idling

      4000 to 18000 kPag

      Shift lever position: P or neutral

      A/C: Off

      Engine speed: 3000 rpm

      8000 to 18000 kPag

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE MALFUNCTIONING PARTSClick here

    OK

  24. INSPECT OTHER RELATED COMPONENTS

    1. Inspect other related components.

      Tip:

      If the malfunctioning part could not be determined by performing the preceding inspections, one of the following malfunctions is suspected.

      • Engine mount deterioration

      • Deposits in the intake manifold or on an intake valve

      • Delay in fuel supply due to adherence of the fuel to the deposits

    Result

    Proceed to

    NEXT
    NEXT

    REPAIR OR REPLACE MALFUNCTIONING PARTSClick here

  25. INSPECT FUEL PUMP CONTROL SYSTEM

    1. Inspect the fuel pump control system.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  26. REPAIR OR REPLACE MALFUNCTIONING PARTS

    1. Repair or replace the malfunctioning part.

    2. Perform "Inspection After Repair" after repairing or replacing the malfunctioning part.

      Click here

    Result

    Proceed to

    NEXT
    NEXT

  27. CONDUCT CONFIRMATION TEST

    1. Check that the engine has returned to normal.

    Result

    Proceed to

    NEXT
    NEXT

    END