SFI SYSTEM, Diagnostic DTC:P0171, P0172, P0174, P0175, P1170, P117B

DTC Code DTC Name
P0171 System Too Lean (Bank 1)
P0172 System Too Rich (Bank 1)
P0174 System Too Lean (Bank 2)
P0175 System Too Rich (Bank 2)
P1170 Port Injector Fuel Performance
P117B Direct Injector Fuel Performance

DESCRIPTION

The fuel trim is related to the feedback compensation value, not to the basic injection time. The fuel trim consists of both the short-term and the long-term fuel trim.

The short-term fuel trim is fuel compensation that is used to constantly maintain the air fuel ratio at stoichiometric levels. The signal from the air fuel ratio sensor indicates whether the air fuel ratio is rich or lean compared to the stoichiometric ratio. This triggers a reduction in the fuel injection volume if the air fuel ratio is rich and an increase in the fuel injection volume if it is lean.

Factors such as individual engine differences, wear over time and changes in operating environment cause short-term fuel trim to vary from the ideal theoretical value. The long-term fuel trim controls overall fuel compensation. The long-term fuel trim compensates for long term deviations of the fuel trim from the ideal theoretical value. These long term deviations result from the corrections made by the short-term fuel trim.

If both the short-term fuel and long-term fuel trim are lean or rich beyond predetermined values, it is interpreted as a malfunction, the ECM illuminates the MIL and sets a DTC.

DTC No. DTC Detection Condition Trouble Area

P0171

P0174

Fuel trim is too lean

(2 trip detection logic)

  • Air induction system

  • Fuel injector assembly for port injection

  • Fuel injector assembly for direct injection

  • Mass air flow meter (Bank 1, 2)

  • Engine coolant temperature sensor

  • Fuel pressure

  • Gas leaks from exhaust system

  • Open or short in air fuel ratio sensor (bank 1, 2 sensor 1) circuit

  • Air fuel ratio sensor (bank 1, 2 sensor 1)

  • Air fuel ratio sensor heater (bank 1, 2 sensor 1)

  • Air fuel ratio sensor (bank 1, 2 sensor 1) heater circuits

  • PCV valve and hose

  • Ventilation hose connections

  • ECM

  • Wire harness or connector

P0172

P0175

Fuel trim is too rich

(2 trip detection logic)

  • Mass air flow meter (Bank 1, 2)

  • Engine coolant temperature sensor

  • Fuel injector assembly for port injection

  • Fuel injector assembly for direct injection

  • Ignition system

  • Fuel pressure

  • Gas leaks from exhaust system

  • Open or short in air fuel ratio sensor (bank 1, 2 sensor 1) circuit

  • Air fuel ratio sensor (bank 1, 2 sensor 1)

  • Air fuel ratio sensor heater (bank 1, 2 sensor 1)

  • Air fuel ratio sensor heater (bank 1, 2 sensor 1) circuits

  • ECM

  • Wire harness or connector
P1170 With stable air fuel ratio feedback, a fuel injection system malfunction has been detected and fuel trim of the port injection is unusually rich or lean.

  • Fuel injector assembly for port injection

  • Fuel injector assembly for direct injection

  • Fuel pressure

  • ECM
P117B With stable air fuel ratio feedback, a fuel injection system malfunction has been detected and fuel trim of the direct injection is unusually rich or lean.

Tech Tips


  • When DTC P0171 or P0174 is set, the actual air-fuel ratio is on the lean side. When DTC P0172 or P0175 is set, the actual air-fuel ratio is on the rich side.

  • If the vehicle runs out of fuel, the air-fuel ratio is lean and DTC P0171 or P0174 may be set. The MIL is then illuminated.

  • When the total of the short-term and long-term fuel trim values is within the malfunction threshold (and the engine coolant temperature is more than 75°C [167°F]), the system is functioning normally.

  • When DTC P1170 or P117B is output, it may not be possible to precisely determine whether the port injection or the direct injection is malfunctioning, depending on the conditions. In this case, perform an Active Test (Control the Injection Way) to determine which injection system is malfunctioning.

MONITOR DESCRIPTION

Under closed loop fuel control, fuel injection volumes that deviate from those estimated by the ECM cause changes in the long-term fuel trim compensation value. The long-term fuel trim is adjusted when there are persistent deviations in the short-term fuel trim values. Deviations from the ECM's estimated fuel injection volumes also affect the average fuel trim learning value, which is a combination of the average short-term fuel trim (fuel feedback compensation value) and the average long-term fuel trim (learning value of the air fuel ratio). If the average fuel trim learning value exceeds the malfunction threshold, the ECM interprets this as a malfunction in the fuel system and sets a DTC.


A01GL14E63

CONFIRMATION DRIVING PATTERN

A01GLYGE02

  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG) and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) Click here.

  4. Turn the engine switch off.

    Tech Tips


    • Let the engine cool down.

    • Touch a radiator hose to check that the coolant temperature has dropped.

  5. Turn the engine switch on (IG) and turn the GTS on [A].

  6. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or more with all the accessories switched off [B].

  7. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

  8. Read the Pending DTCs [C].

    Tech Tips


    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  9. Drive the vehicle at a speed between 37 mph and 75 mph (60 km/h and 120 km/h) and at an engine speed of between 1400 rpm and 3200 rpm for 5 minutes or more [D].

  10. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

  11. Read the Pending DTCs [E].

    Tech Tips


    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  12. Enter the following menus: Powertrain / Engine / Utility / All Readiness.

  13. Input the DTC: P0171, P0172, P0174 or P0175, P1170 or P117B.

  14. Check the DTC judgment result.

    GTS Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU's memory limit

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

    Tech Tips


    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform steps [B] through [E] again.

WIRING DIAGRAM

Refer to DTC P2195 Click here.

INSPECTION PROCEDURE

Tech Tips


  • Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

  • A low air fuel ratio sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.

  • A high air fuel ratio sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

  • Bank 1 refers to the bank that includes the No. 1 cylinder*.

    *: The No. 1 cylinder is the cylinder which is farthest from the transmission.

  • Bank 2 refers to the bank that does not include the No. 1 cylinder.

  • Sensor 1 refers to the sensor closest to the engine assembly.

  • Sensor 2 refers to the sensor farthest away from the engine assembly.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

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

    4. Read the DTCs.

      Result
      Result Proceed to
      DTC P0171, P0172, P0174, P0175, P1170 and/or P117B are output A
      DTC P0171, P0172, P0174, P0175, P1170 and/or P117B and other DTCs are output B

      Tech Tips

      If any DTCs other than P0171, P0172, P0174, P0175, P1170 or P117B are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Start the engine and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Port.

    4. Read the value.


      1. Enter: Data List / Gas A/F Control / Short FT #1 and Long FT #1 and/or Short FT #2 and Long FT #2.

        OK
        Short FT #1, #2 + Long Ft #1, #2 = Between -19% and +19%

    5. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct.

    6. Read the value.


      1. Enter: Data List / Gas A/F Control / Short FT #1 and Long FT #1 and/or Short FT #2 and Long FT #2.

        OK
        Short FT #1, #2 + Long Ft #1, #2 = Between -19% and +19%
        Result
        Item Proceed to
        Port Direct
        OK OK A
        OK NG B
        NG OK C
        NG NG D

    B

    CHECK FUEL PRESSURE SENSOR Click here

    C

    CHECK FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION) Click here

    D

    CHECK VENTILATION HOSE Click here

    A

  3. CHECK IF VEHICLE HAS RUN OUT OF FUEL IN PAST


    1. Has the vehicle run out of fuel in the past?


    NO

    CHECK FOR INTERMITTENT PROBLEMS Click here

    YES

    DTC CAUSED BY RUNNING OUT OF FUEL

  4. CHECK VENTILATION HOSE

    OK
    Ventilation hose is connected correctly and is not damaged.

    NG

    REPAIR OR REPLACE VENTILATION HOSE Click here

    OK

  5. CHECK AIR INDUCTION SYSTEM


    1. Check the air induction system for vacuum leaks.

      OK
      No leaks from intake system.

    NG

    REPAIR OR REPLACE AIR INDUCTION SYSTEM

    OK

  6. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Start the engine and turn the GTS on.

    3. Warm up the engine at an engine speed of 2000 rpm for approximately 90 seconds.

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

    5. Perform the Active Test operation with the engine idling (press the RIGHT or LEFT button to change the fuel injection volume).

    6. Monitor the output voltages of the air fuel ratio sensors and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2) displayed on the GTS.

      Tech Tips


      • Change the fuel injection volume within the range of -12.5% to +12.5%.

      • If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.

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

      GTS Display (Sensor) Injection Volume Status Voltage

      AFS Voltage B1S1 or AFS Voltage B2S1

      (Air fuel ratio)

      		 +12.5% Rich Less than 3.1 V

      AFS Voltage B1S1 or AFS Voltage B2S1

      (Air fuel ratio)

      		 -12.5% Lean More than 3.4 V

      O2S B1S2 or O2S B2S2

      (Heated oxygen)

      		 +12.5% Rich More than 0.55 V

      O2S B1S2 or O2S B2S2

      (Heated oxygen)

      		 -12.5% Lean Less than 0.4 V
      Result

      Status

      AFS Voltage B1S1

      or

      AFS Voltage B2S1

      Status

      O2S B1S2

      or

      O2S B2S2

      Air Fuel Ratio Condition and

      Air Fuel Ratio Sensor Condition

      		 Suspected Trouble Area Proceed to
      Lean/Rich Lean/Rich Normal - A
      Lean Lean Actual air fuel ratio lean

      • PCV valve and hose

      • PCV hose connections

      • Injector assembly for port injection

      • Injector assembly for direct injection

      • Gas leaks from exhaust system

      • Air induction system

      • Fuel pressure

      • Mass air flow meter

      • Engine coolant temperature sensor

      		 A
      Rich Rich Actual air fuel ratio rich

      • Injector assembly for port injection

      • Injector assembly for direct injection

      • Gas leaks from exhaust system

      • Ignition system

      • Fuel pressure

      • Mass air flow meter

      • Engine coolant temperature sensor

      		 A
      Lean Lean/Rich Air fuel ratio sensor malfunction

      • Air fuel ratio sensor

      		 B
      Rich Lean/Rich Air fuel ratio sensor malfunction

      • Air fuel ratio sensor

      		 B

      • Lean:

        During Control the Injection Volume for A/F Sensor, the air fuel ratio sensor output voltage (AFS) is consistently more than 3.4 V, and the heated oxygen sensor output voltage (O2S) is consistently less than 0.4 V.


      • Rich:

        During Control the Injection Volume for A/F Sensor, the AFS is consistently less than 3.1 V, and the O2S is consistently more than 0.55 V.


    B

    INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) Click here

    A

  7. READ VALUE USING GTS (COOLANT TEMP)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.

    4. Read the Data List twice, when the engine is both cold and warmed up.

      Standard
      With cold engine
      Same as ambient air temperature.
      With warm engine
      Between 75 and 95°C (167 and 203°F)

    NG

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    OK

  8. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / Primary / Engine Speed, Coolant Temp, MAF Sensor 1 and MAF Sensor 2.

    5. Allow the engine to idle until the ECT reaches 75°C (167°F) or higher.

    6. Read MAF Sensor 1 and MAF Sensor 2 with the engine speed at 2000 rpm.

      Standard
      Between 2.4 to 12.8 g/s (shift lever is in N position and A/C is OFF)

    NG

    CHECK HARNESS AND CONNECTOR Click here

    OK

  9. CHECK FOR EXHAUST GAS LEAK


    1. Check for exhaust gas leaks.

      OK
      No gas leaks.

    OK

    PERFORM CONFIRMATION DRIVING PATTERN Click here

    NG

    REPAIR OR REPLACE EXHAUST SYSTEM

  10. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)


    1. A01GJX6E01

      Disconnect the E47*1 or E48*2 A/F sensor connector.

      Tech Tips

      *1: Bank 1 Sensor 1

      *2: Bank 2 Sensor 1

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

      Standard resistance (Bank 1 Sensor 1)
      Tester Connection Condition Specified Condition
      1 (HA1A) - 2 (+B) 20°C (68°F) 1.8 to 3.4 Ω
      1 (HA1A) - 4 (A1A-) Always 10 kΩ or higher
      Standard resistance (Bank 2 Sensor 1)
      Tester Connection Condition Specified Condition
      1 (HA2A) - 2 (+B) 20°C (68°F) 1.8 to 3.4 Ω
      1 (HA2A) - 4 (A2A-) Always 10 kΩ or higher
      Result
      Result Proceed to
      OK A
      NG (for 2WD) B
      NG (for AWD) C

    B

    REPLACE AIR FUEL RATIO SENSOR (FOR 2WD) Click here

    C

    REPLACE AIR FUEL RATIO SENSOR (FOR AWD) Click here

    A

  11. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)


    1. A01GLZME01

      Disconnect the E47 and E48 A/F sensor 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
      E47-2 (+B) - Body ground Engine switch on (IG) 11 to 14 V
      E48-2 (+B) - Body ground Engine switch on (IG) 11 to 14 V

    4. Turn the engine switch off.

    5. Disconnect the E3 and E4 ECM connectors.

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

      Standard resistance (Check for open)
      Tester Connection Condition Specified Condition
      E47-1 (HA1A) - E3-5 (HA1A) Always Below 1 Ω
      E47-3 (A1A+) - E4-23 (A1A+) Always Below 1 Ω
      E47-4 (A1A-) - E4-22 (A1A-) Always Below 1 Ω
      E48-1 (HA2A) - E3-6 (HA2A) Always Below 1 Ω
      E48-3 (A2A+) - E4-21 (A2A+) Always Below 1 Ω
      E48-4 (A2A-) - E4-20 (A2A-) Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      E47-1 (HA1A) or E3-5 (HA1A) - Body ground Always 10 kΩ or higher
      E47-3 (A1A+) or E4-23 (A1A+) - Body ground Always 10 kΩ or higher
      E47-4 (A1A-) or E4-22 (A1A-) - Body ground Always 10 kΩ or higher
      E48-1 (HA2A) or E3-6 (HA2A) - Body ground Always 10 kΩ or higher
      E48-3 (A2A+) or E4-21 (A2A+) - Body ground Always 10 kΩ or higher
      E48-4 (A2A-) or E4-20 (A2A-) - Body ground Always 10 kΩ or higher
      A01GIATE15

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. REPLACE AIR FUEL RATIO SENSOR


    1. Replace the air fuel ratio sensor.

      Tech Tips



    NEXT

  13. PERFORM CONFIRMATION DRIVING PATTERN


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

    3. Clear DTCs Click here.

    4. Turn the engine switch off and wait for 30 seconds.

    5. Turn the engine switch on (IG) and turn the GTS on.

    6. Drive the vehicle in accordance with the driving pattern described in the Confirmation Driving Pattern.


    NEXT

  14. CHECK WHETHER DTC OUTPUT RECURS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

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

    4. Read the DTCs.

      Result
      Result Proceed to
      DTC is not output A
      P0171, P0172, P0174, P0175, P1170 and/or P117B are output B

    B

    CHECK FUEL PRESSURE (LOW PRESSURE) Click here

    A

    END

  15. CHECK FUEL PRESSURE (LOW PRESSURE)


    1. Check the fuel pressure Click here.


    OK

    CHECK HARNESS AND CONNECTOR Click here

    NG

    CHECK FUEL PUMP OPERATION Click here

  16. CHECK FUEL PUMP OPERATION


    1. Check the fuel pump operation Click here.


    NG

    REPAIR OR REPLACE FUEL PUMP CONTROL CIRCUIT Click here

    OK

  17. CHECK FUEL LEAK (LOW PRESSURE SIDE)


    1. Check for fuel leaks (low pressure side).

      OK
      No leaks.

    NG

    REPAIR OR REPLACE FUEL SYSTEM

    OK

    CHECK AND REPLACE FUEL PUMP, PRESSURE REGULATOR, FUEL PIPE LINE AND FILTER

  18. CHECK FUEL PRESSURE SENSOR


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

    3. Start the engine.

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

    5. While revving the engine, check that the fuel pressure fluctuates.

      Standard
      Idling
      3000 to 5000 kPa
      2000 rpm (No load)
      7000 to 9000 kPa

      Tech Tips

      The A/C switch and all accessory switches should be off, the shift lever should be in N or P, and the engine should be fully warmed up.


    NG

    CHECK MISFIRE COUNT Click here

    OK

  19. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Start the engine and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct.

      Tech Tips

      The A/C switch and all accessory switches should be off, the shift lever should be in N or P, and the engine should be fully warmed up.

    4. Read the value.


      1. Enter: Data List / A/F Control System / Short FT #1, Long FT #1, Short FT #2, Long FT #2 and Fuel Pump Duty (D4).

        Result
        Item Proceed to
        Fuel Pump Duty (D4) Short FT #1 + Long FT #1 Short FT #2 + Long FT #2
        40% or more -20% or less -20% or less A
        10% or less +20% or more +20% or more A
        40% or more +20% or more +20% or more B
        10% or less -20% or less -20% or less C
        10% to 40% - - D

    A

    REPLACE FUEL PRESSURE SENSOR Click here

    B

    INSPECT FUEL RELIEF VALVE ASSEMBLY Click here

    C

    REPLACE ECM Click here

    D

  20. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Start the engine and turn the GTS on.

    3. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct.

      Tech Tips

      The A/C switch and all accessory switches should be OFF, the shift lever should be in N or P, and the engine should be fully warmed up.

    4. Read the value of the Data List:


      1. Enter: Data List / A/F Control System / Short FT #1, Long FT #1, Short FT #2, Long FT #2 and Fuel Pump Duty (D4).

        Result
        Item Proceed to
        Fuel Pump Duty (D4) Short FT #1 + Long FT #1 Short FT #2 + Long FT #2
        10% to 40% -25% or less -25% or less A
        10% to 40% -25% or less -25% to +25% B
        10% to 40% -25% to +25% -25% or less C
        10% to 40% +30% or more +30% or more A
        10% to 40% +25% or more -25% to +25% B
        10% to 40% -25% to +25% +25% or more C
        10% to 40% -25% to +25% -25% to +25% D

    B

    REPLACE FUEL INJECTOR ASSEMBLY FOR DIRECT INJECTION (BANK 1) Click here

    C

    REPLACE FUEL INJECTOR ASSEMBLY FOR DIRECT INJECTION (BANK 2) Click here

    D

    CHECK FOR INTERMITTENT PROBLEMS Click here

    A

    REPLACE FUEL INJECTOR ASSEMBLY FOR DIRECT INJECTION (ALL CYLINDERS) Click here

  21. CHECK MISFIRE COUNT


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

    3. Start the engine.

    4. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct.

    5. Allow the engine to idle.

    6. Monitor all of the misfire count values that are displayed on the GTS: Powertrain / Engine / Data List / Misfire / Cylinder #1 Misfire Count to Cylinder #8 Misfire Count.

      If no misfire counts occur for any of the cylinders, perform the following procedure:


      1. Move the shift lever to D.

      2. Monitor all of the misfire rate values that are displayed on the GTS.

        Result
        Misfire Count Proceed to
        No misfire counts, or misfire counts occur randomly in all cylinders A
        Misfire counts occur in particular cylinder B

    B

    REPLACE FUEL INJECTOR ASSEMBLY FOR DIRECT INJECTION Click here

    A

  22. INSPECT INJECTOR DRIVER (NO. 1 AND NO. 2)


    1. Turn the engine switch off.

    2. Replace the No. 1 and No. 2 injector drivers with known good ones from another vehicle.

      Note

      Do not disconnect and reconnect the connectors with the engine switch on (IG), as the injector driver (EDU) may be damaged.

    3. Connect the GTS to the DLC3.

    4. Start the engine.

    5. Clear DTCs Click here.

    6. Perform the driving test.

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

    8. Read the DTCs.

      Result
      Result Proceed to
      DTC P0171, P0172, P0174, P0175, P1170 and/or P117B are output A
      DTC is not output B

    B

    REPLACE INJECTOR DRIVER (NO. 1 AND NO. 2) Click here

    A

  23. INSPECT FUEL RELIEF VALVE ASSEMBLY


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG) and turn the GTS on.

    3. Start the engine.

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

    5. Record the Fuel Press value.

    6. Turn the engine switch off.

    7. Wait for 10 seconds.

    8. Turn the engine switch on (IG) and turn the GTS on.

    9. Enter the following menus: Powertrain / Engine / Data List / Fuel Press.

    10. Compare the Fuel Press value recorded with the engine running to the Fuel Press value currently shown on the GTS.

      Result
      Inspection Result Proceed to
      Fuel Press value drops A
      Fuel Press value is maintained B

    A

    REPLACE FUEL RELIEF VALVE ASSEMBLY Click here

    B

    REPLACE FUEL PUMP ASSEMBLY FOR HIGH PRESSURE Click here

  24. CHECK FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION)


    1. Check the injection volume (whether fuel volume is high or low, and whether injection pattern is poor) Click here.


    NG

    REPLACE FUEL INJECTOR ASSEMBLY FOR PORT INJECTION Click here

    OK

    REPLACE ECM Click here

  25. CHECK HARNESS AND CONNECTOR


    1. Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter and ECM Click here.

      Tech Tips

      Repair any problems.


    NEXT

  26. PERFORM CONFIRMATION DRIVING PATTERN


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs Click here.

    5. Turn the engine switch off.

    6. Turn the engine switch on (IG) and turn the GTS on.

    7. Start the engine and warm it up.

    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.


    NEXT

  27. CHECK WHETHER DTC OUTPUT RECURS (DTC P0171, P0172, P0174, P0175, P1170 OR P117B)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

    5. Read the pending DTCs.

      Result
      Display (DTC output) Proceed to
      P0171, P0172, P0174, P0175, P1170 or P117B A
      No output B

    B

    END

    A

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

    A01GNGXE01

    1. Disconnect the E13 or E22 MAF meter connector.

    2. Disconnect the E1 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
      E13-1 (VG) - E1-25 (VG) Always Below 1 Ω
      E13-2 (E2G) - E1-24 (E2G) Always Below 1 Ω
      E22-1 (VGR) - E1-23 (VG2) Always Below 1 Ω
      E22-2 (EVGR) - E1-32 (E2G2) Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      E13-1 (VG) or E1-25 (VG) - Body ground Always 10 kΩ or higher
      E22-1 (VGR) or E1-23 (VG2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  29. REPLACE MASS AIR FLOW METER (BANK 1 AND/OR BANK 2)


    1. Replace the mass air flow meter (bank 1 and/or bank 2) Click here.

      Tech Tips

      If the results of the inspections performed in steps 8 indicated no problem, proceed to the next step without replacing the mass air flow meter.


    NEXT

  30. PERFORM CONFIRMATION DRIVING PATTERN


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs Click here.

    5. Turn the engine switch off.

    6. Turn the engine switch on (IG) and turn the GTS on.

    7. Start the engine and warm it up.

    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.


    NEXT

  31. CHECK WHETHER DTC OUTPUT RECURS (DTC P0171, P0172, P0174, P0175, P1170 OR P117B)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

    5. Read the pending DTCs.

      Result
      Display (DTC output) Proceed to
      P0171, P0172, P0174, P0175, P1170 or P117B A
      No output B

    B

    END

    A

    REPLACE ECM Click here