SFI SYSTEM(w/o Canister Pump Module), 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 Fuel Performance / Port Injector
P117B Fuel Performance / Direct Injector

DESCRIPTION

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

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 lean.

Factors such as individual engine differences, wear over time and changes in operating environment cause short-term fuel trim to vary from the central value. The long-term fuel trim, which controls overall fuel compensation, compensates for long-term deviations in the fuel trim from the central value caused by the short-term fuel trim compensation.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0171 System Too Lean (Bank 1) With a warm engine and stable air fuel ratio feedback, the fuel trim is considerably in error to the lean side (2 trip detection logic).

  • Intake system

  • Port fuel injector assembly

  • Direct fuel injector assembly

  • Mass air flow meter sub-assembly

  • Engine coolant temperature sensor

  • Fuel pressure

  • Fuel delivery pipe LH (fuel pressure sensor)

  • Injector driver

  • Gas leak from exhaust system

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

  • Air fuel ratio sensor (bank 1 sensor 1)

  • PCV valve and hose

  • PCV hose connections

  • Wire harness or connector

  • ECM

 Comes on (Euro-OBD) / - (Except Euro-OBD) DTC stored (Euro-OBD) / - (Except Euro-OBD)
P0172 System Too Rich (Bank 1) With a warm engine and stable air fuel ratio feedback, the fuel trim is considerably in error to the rich side (2 trip detection logic).

  • Intake system

  • Port fuel injector assembly

  • Direct fuel injector assembly

  • Mass air flow meter sub-assembly

  • Engine coolant temperature sensor

  • Ignition system

  • Fuel pressure

  • Fuel delivery pipe LH (fuel pressure sensor)

  • Injector driver

  • Gas leak from exhaust system

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

  • Air fuel ratio sensor (bank 1 sensor 1)

  • Wire harness or connector

  • ECM

 Comes on (Euro-OBD) / - (Except Euro-OBD) DTC stored (Euro-OBD) / - (Except Euro-OBD)
P0174 System Too Lean (Bank 2) With a warm engine and stable air fuel ratio feedback, the fuel trim is considerably in error to the lean side (2 trip detection logic).

  • Intake system

  • Port fuel injector assembly

  • Direct fuel injector assembly

  • Mass air flow meter sub-assembly

  • Engine coolant temperature sensor

  • Fuel pressure

  • Fuel delivery pipe LH (fuel pressure sensor)

  • Injector driver

  • Gas leak from exhaust system

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

  • Air fuel ratio sensor (bank 2 sensor 1)

  • PCV valve and hose

  • PCV hose connections

  • Wire harness or connector

  • ECM

 Comes on (Euro-OBD) / - (Except Euro-OBD) DTC stored (Euro-OBD) / - (Except Euro-OBD)
P0175 System Too Rich (Bank 2) With a warm engine and stable air fuel ratio feedback, the fuel trim is considerably in error to the rich side (2 trip detection logic).

  • Intake system

  • Port fuel injector assembly

  • Direct fuel injector assembly

  • Mass air flow meter sub-assembly

  • Engine coolant temperature sensor

  • Ignition system

  • Fuel pressure

  • Fuel delivery pipe LH (fuel pressure sensor)

  • Injector driver

  • Gas leak from exhaust system

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

  • Air fuel ratio sensor (bank 2 sensor 1)

  • Wire harness or connector

  • ECM

 Comes on (Euro-OBD) / - (Except Euro-OBD) DTC stored (Euro-OBD) / - (Except Euro-OBD)
P1170 Fuel Performance / Port Injector Although a DTC is stored for a rich or lean condition, the amount of fuel trim during direct injection is normal (1 trip detection logic).

  • Port fuel injector assembly

  • Fuel pressure

  • ECM

 Does not come on (Euro-OBD) / - (Except Euro-OBD) DTC stored (Euro-OBD) / - (Except Euro-OBD)
P117B Fuel Performance / Direct Injector Although a DTC is stored for a rich or lean condition, the amount of fuel trim during port injection is normal (1 trip detection logic).

  • Direct fuel injector assembly

  • Fuel pressure

  • ECM

 Does not come on (Euro-OBD) / - (Except Euro-OBD) DTC stored (Euro-OBD) / - (Except Euro-OBD)

Tech Tips


  • When DTC P0171 or P0174 is stored, the actual air fuel ratio is on the lean side. When DTC P0172 or P0175 is stored, 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 stored. The MIL is then illuminated.

  • 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 fuel injection volumes estimated by the ECM also affect the average fuel trim learned value, which is a combination of the average short-term fuel trim (fuel feedback compensation value) and the average long-term fuel trim (learned value of the air fuel ratio). If the average fuel trim learned value exceeds the malfunction thresholds, the ECM interprets this as a fault in the fuel system and stores a DTC.

Example:

The average fuel trim learned value is +35% or higher, or -35% or less, the ECM interprets this as a fuel system malfunction.

B000Z4AE01

MONITOR STRATEGY

Required Sensors/Components (Main) Fuel system
Required Sensors/Components (Related)

Air fuel ratio sensor

Mass air flow meter sub-assembly

Crankshaft position sensor
Frequency of Operation Continuous

TYPICAL ENABLING CONDITIONS

Fuel system status Closed loop
Battery voltage 11 V or higher
Either of the following conditions is met 1 or 2
1. Engine speed Less than 1100 rpm
2. Engine load 10% or more

TYPICAL MALFUNCTION THRESHOLDS

P0171, P0172, P0174 and P0175: Fuel-Trim Lean/Rich
EVAP purge-cut Executing
Either of the following conditions is met 1 or 2
1. Average between short-term fuel trim and long-term fuel trim 35% or more (varies with engine coolant temperature)
2. Average between short-term fuel trim and long-term fuel trim -35% or less (varies with engine coolant temperature)
P1170: Fuel Trim (Port Injection Fail)
DTCs of fuel system have already been set -
EVAP purge-cut Executing
Direct injection 100%
Both of the following conditions are met 1 and 2
1. Average between short-term fuel trim and long-term fuel trim Less than 35% (varies with engine coolant temperature)
2. Average between short-term fuel trim and long-term fuel trim More than -35% (varies with engine coolant temperature)
P117B: Fuel Trim (Direct Injection Fail)
DTCs of fuel system have already been set -
EVAP purge-cut Executing
Port injection 100%
Both of the following conditions are met 1 and 2
1. Average between short-term fuel trim and long-term fuel trim Less than 35% (varies with engine coolant temperature)
2. Average between short-term fuel trim and long-term fuel trim More than -35% (varies with engine coolant temperature)

CONFIRMATION DRIVING PATTERN

B000V05E11

  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG).

  3. Turn the GTS on.

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

  5. Turn the engine switch off.

    Tech Tips


    • Let the engine cool down.

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

  6. Turn the engine switch on (IG).

  7. Turn the GTS on [A].

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

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

  10. Read the pending DTCs [C].

    Tech Tips


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

    • If no pending DTC is output, perform the following procedure.

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

    CAUTION:

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

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

  13. Read the pending DTCs [E].

    Tech Tips


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

    • If no pending DTC is output, the system is normal.

WIRING DIAGRAM

Refer to DTC P0102 for the mass air flow meter sub-assembly circuit.

Click here

Refer to DTC P2195 for the air fuel ratio sensor circuit.

Click here

CAUTION / NOTICE / HINT

Note

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

Tech Tips


  • 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.

  • 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.

  • 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 help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0171, P0172, P0174, P0175, P1170 AND 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.


      Powertrain > Engine > Trouble Codes

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC P0171, P0172, P0174, P0175, P1170 and/or P117B is 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. PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION WAY)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Start the engine and warm it up.

    5. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Port / Injection Way, Short FT B1S1 and Long FT B1S1 and/or Short FT B2S1 and Long FT B2S1.


      Powertrain > Engine > Active Test
      Active Test Display
      Control the Injection Way
      Data List Display
      Short FT B1S1
      Long FT B1S1
      Short FT B2S1
      Long FT B2S1

    6. Read the values displayed on the GTS.

      OK
      Short FT B1S1 + Long FT B1S1 or Short FT B2S1 + Long FT B2S1 = Between -19% and +19% (Port injection)

    7. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct / Injection Way, Short FT B1S1 and Long FT B1S1 and/or Short FT B2S1 and Long FT B2S1.


      Powertrain > Engine > Active Test
      Active Test Display
      Control the Injection Way
      Data List Display
      Short FT B1S1
      Long FT B1S1
      Short FT B2S1
      Long FT B2S1

    8. Read the values displayed on the GTS.

      OK
      Short FT B1S1 + Long FT B1S1 or Short FT B2S1 + Long FT B2S1 = Between -19% and +19% (Direct injection)
      Result
      Item Proceed to
      Port Direct
      OK OK A
      OK NG B
      NG OK C
      NG NG D

    B

    READ VALUE USING GTS (FUEL PRESS) Click here

    C

    INSPECT PORT FUEL INJECTOR ASSEMBLY Click here

    D

    CHECK PCV HOSE CONNECTIONS 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?

      Result
      Proceed to
      YES
      NO

    YES

    DTC CAUSED BY RUNNING OUT OF FUEL

    NO

    CHECK FOR INTERMITTENT PROBLEMS Click here

  4. READ VALUE USING GTS (FUEL PRESS)


    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 / Ptrl General / Fuel Press.


      Powertrain > Engine > Data List
      Tester Display
      Fuel Press

    5. Read the values.

      Standard
      Idling
      3500 to 4500 kPag.
      2000 rpm (No load)
      2500 to 4500 kPag.

      Tech Tips

      The A/C switch and all accessory switches should be off, and the shift state should be Park (P), and the engine should be fully warmed up.

      Result
      Proceed to
      OK
      NG

    NG

    PERFORM GTS (CONTROL THE INJECTION WAY (DIRECT)) Click here

    OK

  5. PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION WAY (DIRECT))


    1. Connect the GTS to the DLC3.

    2. Start the engine and warm it up.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct / Injection Way, Short FT B1S1, Long FT B1S1, Short FT B2S1, Long FT B2S1, Fuel Pump Duty (D4) and Fuel Pump2 Duty (D4).


      Powertrain > Engine > Active Test
      Active Test Display
      Control the Injection Way
      Data List Display
      Fuel Pump Duty (D4)
      Fuel Pump2 Duty (D4)
      Injection Way
      Short FT B1S1
      Long FT B1S1
      Short FT B2S1
      Long FT B2S1

    5. Read the values displayed on the GTS.

      Tech Tips

      The A/C switch and all accessory switches should be off and park (P) should be selected and the engine should be fully warmed up.

      Result
      Item Proceed to
      Fuel Pump Duty (D4) Fuel Pump2 Duty (D4) Short FT B1S1 + Long FT B1S1 Short FT B2S1 + Long FT B2S1
      40% or more 40% or more -20% or less -20% or less A
      10% or less 10% or less +20% or more +20% or more
      40% or more 40% or more +20% or more +20% or more B
      10% or less 10% or less -20% or less -20% or less C
      10% to 40% 10% to 40% - - D

      Tech Tips

      Perform "Inspection After Repair" after replacing the fuel pump with seal sub-assembly (for high pressure side).

      Click here


    A

    REPLACE FUEL DELIVERY PIPE LH (FUEL PRESSURE SENSOR) Click here

    B

    REPLACE FUEL PUMP WITH SEAL SUB-ASSEMBLY (FOR HIGH PRESSURE SIDE) Click here

    C

    REPLACE ECM Click here

    D

  6. PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION WAY (DIRECT))


    1. Connect the GTS to the DLC3.

    2. Start the engine and warm it up.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct / Injection Way, Short FT B1S1, Long FT B1S1, Short FT B2S1, Long FT B2S1, Fuel Pump Duty (D4) and Fuel Pump2 Duty (D4).


      Powertrain > Engine > Active Test
      Active Test Display
      Control the Injection Way
      Data List Display
      Fuel Pump Duty (D4)
      Fuel Pump2 Duty (D4)
      Injection Way
      Short FT B1S1
      Long FT B1S1
      Short FT B2S1
      Long FT B2S1

    5. Read the values displayed on the GTS.

      Tech Tips

      The A/C switch and all accessory switches should be off and park (P) should be selected and the engine should be fully warmed up.

      Result
      Item Proceed to
      Fuel Pump Duty (D4) Fuel Pump2 Duty (D4) Short FT B1S1 + Long FT B1S1 Short FT B2S1 + Long FT B2S1
      10% to 40% 10% to 40% -25% or less -25% or less A
      10% to 40% 10% to 40% +30% or more +30% or more
      10% to 40% 10% to 40% -25% or less -25% to +25% B
      10% to 40% 10% to 40% +25% or more -25% to +25%
      10% to 40% 10% to 40% -25% to +25% -25% or less C
      10% to 40% 10% to 40% -25% to +25% +25% or more
      10% to 40% 10% to 40% -25% to +25% -25% to +25% D

      Tech Tips

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

      Click here


    A

    REPLACE DIRECT FUEL INJECTOR ASSEMBLY (ALL CYLINDERS) Click here

    B

    REPLACE DIRECT FUEL INJECTOR ASSEMBLY (BANK 1) Click here

    C

    REPLACE DIRECT FUEL INJECTOR ASSEMBLY (BANK 2) Click here

    D

    CHECK FOR INTERMITTENT PROBLEMS Click here

  7. PERFORM GTS (CONTROL THE INJECTION WAY (DIRECT))


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Start the engine and warm it up.

    5. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Way / Direct / Injection Way and Cylinder #1 Misfire Count to Cylinder #8 Misfire Count.


      Powertrain > Engine > Active Test
      Active Test Display
      Control the Injection Way
      Data List Display
      Injection Way
      Cylinder #1 Misfire Count
      Cylinder #2 Misfire Count
      Cylinder #3 Misfire Count
      Cylinder #4 Misfire Count
      Cylinder #5 Misfire Count
      Cylinder #6 Misfire Count
      Cylinder #7 Misfire Count
      Cylinder #8 Misfire Count

    6. Allow the engine to idle.

    7. Monitor all of the misfire count values that are displayed on the GTS.

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

      Tech Tips

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

      Click here


    B

    REPLACE DIRECT FUEL INJECTOR ASSEMBLY Click here

    A

  8. CHECK INJECTOR DRIVER (NO. 1 AND NO. 2)


    1. Turn the engine switch off.

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

      Note

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

    3. Connect the GTS to the DLC3.

    4. Turn the engine switch on (IG).

    5. Turn the GTS on.

    6. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    7. Turn the engine switch off and wait for at least 30 seconds.

    8. Start the engine and warm it up.

    9. Turn the GTS on.

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

    11. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTC P0171, P0172, P0174, P0175, P1170 and/or P117B are output A
      DTCs are not output B

      Tech Tips

      Perform "Inspection After Repair" after replacing the fuel pump with seal sub-assembly (for high pressure side).

      Click here


    A

    REPLACE FUEL PUMP WITH SEAL SUB-ASSEMBLY (FOR HIGH PRESSURE SIDE) Click here

    B

    END (INJECTOR DRIVER WAS DEFECTIVE)

  9. INSPECT PORT FUEL INJECTOR ASSEMBLY


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

      Click here

      Tech Tips

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

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPLACE PORT FUEL INJECTOR ASSEMBLY Click here

  10. CHECK PCV HOSE CONNECTIONS


    1. Check the PCV hose connections.

      Click here

      OK
      PCV valve and hose are connected correctly and are not damaged.
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE PCV HOSE

    OK

  11. CHECK INTAKE SYSTEM


    1. Check the intake system for vacuum leaks.

      Click here

      OK
      No leaks in intake system.

      Tech Tips

      Perform "Inspection After Repair" after repairing or replacing the intake system.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE INTAKE SYSTEM

    OK

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


    1. Connect the GTS to the DLC3.

    2. Start the engine.

    3. Turn the GTS on.

    4. Warm up the engine and run the engine at an engine speed of 2500 rpm for approximately 90 seconds.

    5. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / Ptrl AF Control / AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2.


      Powertrain > Engine > Active Test
      Active Test Display
      Control the Injection Volume for A/F Sensor
      Data List Display
      AFS Voltage B1S1
      AFS Voltage B2S1
      O2S B1S2
      O2S B2S2

    6. Perform the Control the Injection Volume for A/F Sensor operation with the engine idling (press the RIGHT or LEFT button to change the fuel injection volume).

    7. Monitor the voltage outputs of the air fuel ratio sensor and the heated oxygen sensor (AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2) displayed on the GTS.

      Tech Tips


      • Change the injection volume operation lowers the fuel injection volume by 12.5% or increases the injection volume by 12.5%.

      • 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.

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

      Standard
      GTS Display (Sensor) Injection Volume Status Voltage

      AFS Voltage B1S1

      AFS Voltage B2S1

      (Air fuel ratio)

      		 12.5% Rich Below 3.1 V
      -12.5% Lean Higher than 3.4 V

      O2S B1S2

      O2S B2S2

      (Heated oxygen)

      		 12.5% Rich Higher than 0.55 V
      -12.5% Lean Below 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

      • Intake system

      • Fuel pressure

      • Mass air flow meter sub-assembly

      • Engine coolant temperature sensor
      Rich Rich Actual air fuel ratio rich

      • Gas leak from exhaust system

      • Ignition system

      • Fuel pressure

      • Mass air flow meter sub-assembly

      • Engine coolant temperature sensor
      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

      • Lean: During Control the Injection Volume for A/F Sensor, the air fuel ratio sensor output voltage (AFS Voltage B1S1 or AFS Voltage B2S1) is consistently higher than 3.4 V, and the heated oxygen sensor output voltage (O2S B1S2 or O2S B2S2) is consistently below 0.4 V.

      • Rich: During Control the Injection Volume for A/F Sensor, the AFS Voltage B1S1 or AFS Voltage B2S1 is consistently below 3.1 V, and the O2S B1S2 or O2S B2S2 is consistently higher than 0.55 V.

      • Lean/Rich: During Control the Injection Volume for A/F Sensor of the Active Test, the output voltage of the heated oxygen sensor alternates correctly.

      Tech Tips

      Refer to "Data List / Active Test" [AFS Voltage B1S1, AFS Voltage B2S1, O2S B1S2 and O2S B2S2].

      Click here


    B

    INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE) Click here

    A

  13. READ VALUE USING GTS (COOLANT TEMP)


    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 / All Data / Coolant Temp.


      Powertrain > Engine > Data List
      Tester Display
      Coolant Temp

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

      Standard
      GTS Display Condition Specified Condition
      Coolant Temp Cold engine Same as ambient air temperature
      Warm engine Between 75 and 100°C (167 and 212°F)

      Tech Tips

      Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    OK

  14. READ VALUE USING GTS (MAF SENSOR)


    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 / All Data / MAF Sensor 1, MAF Sensor 2, Coolant Temp and Engine Speed.


      Powertrain > Engine > Data List
      Tester Display
      Engine Speed
      MAF Sensor 1
      MAF Sensor 2
      Coolant Temp

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

    6. Read MAF Sensor with the engine speed at 3000 rpm.

      Standard
      GTS Display Condition Specified Condition
      MAF Sensor 1

      Shift position: P

      A/C: Off

      Engine Speed: 3000 rpm

      		 Between 8.5 gm/sec and 11.5 gm/sec
      MAF Sensor 2 Between 8.5 gm/sec and 11.5 gm/sec
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 24 Click here

    OK

  15. CHECK FOR EXHAUST GAS LEAK


    1. Check for exhaust gas leaks.

      OK
      No gas leaks.

      Tech Tips

      Perform "Inspection After Repair" after repairing or replacing the exhaust system.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE EXHAUST SYSTEM

    OK

  16. CHECK FUEL PRESSURE (FOR LOW PRESSURE SIDE)


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

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 22 Click here

    NG

  17. CHECK FUEL PUMP OPERATION (FOR LOW PRESSURE SIDE)


    1. Check the fuel pump operation (for low pressure side).

      Click here

      Tech Tips

      Perform "Inspection After Repair" after replacing the fuel pump assembly (for low pressure side).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FUEL PUMP ASSEMBLY (FOR LOW PRESSURE SIDE) Click here

    OK

  18. CHECK FUEL LEAK (FOR LOW PRESSURE SIDE)


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

      OK
      No leaks.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPAIR OR REPLACE FUEL SYSTEM (FOR LOW PRESSURE SIDE)

  19. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

    Result
    Proceed to
    OK
    NG

    1. Inspect the air fuel ratio sensor.

      Click here

      Tech Tips

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

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIR FUEL RATIO SENSOR Click here

    OK

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

    Result
    Proceed to
    OK
    NG

    1. Disconnect the air fuel ratio sensor connector.

    2. Disconnect the ECM connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G62-1 (HA1A) - G42-19 (HA1A) Always Below 1 Ω
      G62-3 (A1A+) - G42-125 (A1A+) Always Below 1 Ω
      G62-4 (A1A-) - G42-126 (A1A-) Always Below 1 Ω
      G63-1 (HA2A) - G42-18 (HA2A) Always Below 1 Ω
      G63-3 (A2A+) - G42-123 (A2A+) Always Below 1 Ω
      G63-4 (A2A-) - G42-124 (A2A-) Always Below 1 Ω
      G62-1 (HA1A) or G42-19 (HA1A) - Body ground and other terminals Always 10 kΩ or higher
      G62-3 (A1A+) or G42-125 (A1A+) - Body ground and other terminals Always 10 kΩ or higher
      G62-4 (A1A-) or G42-126 (A1A-) - Body ground and other terminals Always 10 kΩ or higher
      G63-1 (HA2A) or G42-18 (HA2A) - Body ground and other terminals Always 10 kΩ or higher
      G63-3 (A2A+) or G42-123 (A2A+) - Body ground and other terminals Always 10 kΩ or higher
      G63-4 (A2A-) or G42-124 (A2A-) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  21. REPLACE AIR FUEL RATIO SENSOR


    1. Replace the air fuel ratio sensor.

      Click here

      Tech Tips

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

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  22. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the engine switch off and wait for at least 30 seconds.

      Result
      Proceed to
      NEXT

    NEXT

  23. CHECK WHETHER DTC OUTPUT RECURS (DTC P0171, P0172, P0174, P0175, P1170 AND P117B)


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

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


      Powertrain > Engine > Trouble Codes

    3. Read the DTCs.

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

    B

    END

    A

  24. CHECK FOR HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)


    1. Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM.

      Click here

      Tech Tips

      Repair any problems.

      Result
      Proceed to
      NEXT

    NEXT

  25. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the engine switch off and wait for at least 30 seconds.

      Result
      Proceed to
      NEXT

    NEXT

  26. CHECK WHETHER DTC OUTPUT RECURS (DTC P0171, P0172, P0174, P0175, P1170 AND P117B)


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

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


      Powertrain > Engine > Trouble Codes

    3. Read the DTCs.

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

    B

    END

    A

  27. CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)

    Result
    Proceed to
    OK
    NG

    1. Disconnect the mass air flow meter sub-assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A61-3 (VCC) - A58-39 (VCVG) Always Below 1 Ω
      A61-1 (FG) - A58-37 (VG) Always Below 1 Ω
      A61-2 (E2G) - A58-38 (E2G) Always Below 1 Ω
      A60-3 (VCCR) - A58-56 (VCCR) Always Below 1 Ω
      A60-1 (FGR) - A58-55 (VG2) Always Below 1 Ω
      A60-2 (E2GR) - A58-41 (E2G2) Always Below 1 Ω
      A61-3 (VCC) or A58-39 (VCVG) - Body ground and other terminals Always 10 kΩ or higher
      A61-1 (FG) or A58-37 (VG) - Body ground and other terminals Always 10 kΩ or higher
      A61-2 (E2G) or A58-38 (E2G) - Body ground and other terminals Always 10 kΩ or higher
      A60-3 (VCCR) or A58-56 (VCCR) - Body ground and other terminals Always 10 kΩ or higher
      A60-1 (FGR) or A58-55 (VG2) - Body ground and other terminals Always 10 kΩ or higher
      A60-2 (E2GR) or A58-41 (E2G2) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  28. REPLACE MASS AIR FLOW METER SUB-ASSEMBLY


    1. Replace the mass air flow meter sub-assembly.

      Click here

      Tech Tips


      • If the results of the inspections performed in step 14 indicated no problem, proceed to the next step without replacing the mass air flow meter sub-assembly.

      • Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

        Click here

      Result
      Proceed to
      NEXT

    NEXT

  29. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine > Clear DTCs

    5. Turn the engine switch off and wait for at least 30 seconds.

      Result
      Proceed to
      NEXT

    NEXT

  30. CHECK WHETHER DTC OUTPUT RECURS (DTC P0171, P0172, P0174, P0175, P1170 AND P117B)


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

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


      Powertrain > Engine > Trouble Codes

    3. Read the DTCs.

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

    A

    REPLACE ECM Click here

    B

    END