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

DTC Code DTC Name
P0171 System Too Lean (Bank 1)
P0172 System Too Rich (Bank 1)
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

  • Fuel injector assembly (for port injection)

  • Fuel injector set (for direct injection)

  • Mass air flow meter sub-assembly

  • Engine coolant temperature sensor

  • Fuel pressure

  • Fuel pressure sensor

  • Injector driver (EDU)

  • Gas leak from exhaust system

  • Open or short in air fuel ratio sensor circuit

  • Air fuel ratio sensor

  • PCV valve and hose

  • PCV hose connections

  • EGR valve assembly

  • Wire harness or connector

  • ECM

 Comes on DTC stored
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).

  • Fuel injector assembly (for port injection)

  • Fuel injector set (for direct injection)

  • Mass air flow meter sub-assembly

  • Engine coolant temperature sensor

  • Ignition system

  • Fuel pressure

  • Fuel pressure sensor

  • Injector driver (EDU)

  • Gas leak from exhaust system

  • Open or short in air fuel ratio sensor circuit

  • Air fuel ratio sensor

  • EGR valve assembly

  • Wire harness or connector

  • ECM

 Comes on DTC stored
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 (2 trip detection logic)

  • Fuel injector assembly (for port injection)

  • Fuel injector set (for direct injection)

  • Fuel pressure

  • ECM

 Does not come on DTC stored
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 (2 trip detection logic)

  • Fuel injector assembly (for port injection)

  • Fuel injector set (for direct injection)

  • Fuel pressure

  • ECM

 Does not come on DTC stored

Tech Tips


  • When DTC P0171 is stored, the actual air fuel ratio is on the lean side. When DTC P0172 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 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.

A01WY8CE01

MONITOR STRATEGY

Required Sensors/Components

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
Auxiliary 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 higher

TYPICAL MALFUNCTION THRESHOLDS

P0171, P0172: Fuel Trim
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 higher (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
Injection mode Direct
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
Injection mode Port
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

A01WX77E02

  1. Connect the GTS to the DLC3.

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

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

  4. Turn the power switch off and wait for at least 30 seconds.

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

  6. Put the engine in inspection mode (maintenance mode).

    Click here

  7. 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].

  8. With the engine warmed up, idle the engine for 5 minutes or more [C].

  9. With the engine warmed up, drive the vehicle at a speed between 75 and 100 km/h (47 and 62 mph) for 5 minutes or more [D].

    CAUTION:

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

    Tech Tips

    If the engine stops, further depress the accelerator pedal to restart the engine.

  10. Idle the engine for 5 minutes or more [E].

  11. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [F].

  12. Read the pending DTCs.

    Tech Tips

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

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


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

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

  • 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.

  • 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.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0171, P0172, P1170 OR P117B)


    1. Connect the GTS to the DLC3

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

    5. Read the DTCs.


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Result Proceed to
      DTC P0171, P0172, P1170 or P117B is output A
      DTC P0171, P0172, P1170 and/or P117B and other DTCs are output B

      Tech Tips

      If any DTCs other than P0171, P0172, 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 power switch on (IG).

    3. Turn the GTS on.

    4. Put the engine in inspection mode (maintenance mode).

      Click here


      Powertrain > Hybrid Control > Utility
      Tester Display
      Inspection Mode

    5. Start the engine and warm it up.

    6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Way / Port / Data List / Injection Way, Short FT #1 and Long FT #1.


      Powertrain > Engine and ECT > Active Test
      Active Test Display
      Control the Injection Way
      Data List Display
      Injection Way
      Short FT #1
      Long FT #1

    7. Read the values displayed on the GTS.

      OK
      Short FT #1 + Long FT #1 = Between -19% and +19%.

    8. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Way / Direct / Data List / Injection Way, Short FT #1 and Long FT #1.


      Powertrain > Engine and ECT > Active Test
      Active Test Display
      Control the Injection Way
      Data List Display
      Injection Way
      Short FT #1
      Long FT #1

    9. Read the values displayed on the GTS.

      OK
      Short FT #1 + Long FT #1 = Between -19% and +19%.
      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 FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION) 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. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Put the engine in inspection mode (maintenance mode).

      Click here


      Powertrain > Hybrid Control > Utility
      Tester Display
      Inspection Mode

    5. Start the engine and warm it up.

    6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Way / Direct / Data List / Fuel Press.


      Powertrain > Engine and ECT > Active Test
      Active Test Display
      Control the Injection Way
      Data List Display
      Fuel Press

    7. Read the values.

      Standard
      2000 to 4000 kPag (Idling, direct injection control).
      Result
      Proceed to
      OK
      NG

    NG

    CHECK MISFIRE COUNT OF DIRECT INJECTION Click here

    OK

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


    1. Connect the GTS to the DLC3.

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

    3. Put the engine in inspection mode (maintenance mode).

      Click here


      Powertrain > Hybrid Control > Utility
      Tester Display
      Inspection Mode

    4. Start the engine and warm it up.

    5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Way / Direct / Data List / Injection Way, Short FT #1, Long FT #1 and Fuel Pump Duty (D4).


      Powertrain > Engine and ECT > Active Test
      Active Test Display
      Control the Injection Way
      Data List Display
      Fuel Pump Duty (D4)
      Injection Way
      Short FT #1
      Long FT #1

    6. Read the values displayed on the GTS.

      Tech Tips

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

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

      Tech Tips

      Perform "Inspection After Repair" after replacing the fuel pump (for high pressure).

      Click here


    B

    REPLACE FUEL DELIVERY PIPE SUB-ASSEMBLY (FUEL PRESSURE SENSOR) Click here

    C

    REPLACE FUEL PUMP (FOR HIGH PRESSURE) Click here

    D

    REPLACE ECM Click here

    A

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


    1. Connect the GTS to the DLC3.

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

    3. Put the engine in inspection mode (maintenance mode).

      Click here


      Powertrain > Hybrid Control > Utility
      Tester Display
      Inspection Mode

    4. Start the engine and warm it up.

    5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Way / Direct / Data List / Injection Way, Short FT #1, Long FT #1 and Fuel Pump Duty (D4).


      Powertrain > Engine and ECT > Active Test
      Active Test Display
      Control the Injection Way
      Data List Display
      Fuel Pump Duty (D4)
      Injection Way
      Short FT #1
      Long FT #1

    6. Read the values displayed on the GTS.

      Tech Tips

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

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

      Tech Tips

      Perform "Inspection After Repair" after replacing the fuel injector set (for direct injection).

      Click here


    A

    REPLACE FUEL INJECTOR SET (FOR DIRECT INJECTION) Click here

    B

    CHECK FOR INTERMITTENT PROBLEMS Click here

  7. CHECK MISFIRE COUNT OF DIRECT INJECTION


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Put the engine in inspection mode (maintenance mode).

      Click here


      Powertrain > Hybrid Control > Utility
      Tester Display
      Inspection Mode

    5. Start the engine and warm it up.

    6. Enter the following menus: Powertrain / Engine and ECT / Active test / Control the Injection Way / Direct / Data List / Injection Way and Cylinder #1 Misfire Count to Cylinder #4 Misfire Count.


      Powertrain > Engine and ECT > 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

    7. Allow the engine to idle.

    8. Read the values 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 fuel injector set (for direct injection).

      Click here


    B

    REPLACE FUEL INJECTOR SET (FOR DIRECT INJECTION) Click here

    A

  8. INSPECT INJECTOR DRIVER (EDU)


    1. Replace the injector driver (EDU) with known good ones from another vehicle.

      Note

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

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

    5. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

    6. Turn the power switch off and wait for at least 30 seconds.

    7. Turn the power switch on (IG) and turn the GTS on.

    8. Put the engine in inspection mode (maintenance mode).

      Click here


      Powertrain > Hybrid Control > Utility
      Tester Display
      Inspection Mode

    9. Start the engine and warm it up.

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

    11. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    12. Read the pending DTCs.


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

      Tech Tips

      Perform "Inspection After Repair" after replacing the fuel pump (for high pressure).

      Click here


    A

    REPLACE FUEL PUMP (HIGH PRESSURE) Click here

    B

    END (INJECTOR DRIVER WAS DEFECTIVE)

  9. INSPECT 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

      Tech Tips

      Perform "Inspection After Repair" after replacing the fuel injector assembly (for port injection).

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPLACE FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION) 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. Turn the power switch on (IG) and turn the GTS on.

    3. Put the engine in inspection mode (maintenance mode).

      Click here


      Powertrain > Hybrid Control > Utility
      Tester Display
      Inspection Mode

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

    5. Idle the engine for 5 minutes or more with the shift lever in P.

    6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / Data List / AFS Voltage B1S1 and O2S B1S2.


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

    7. 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).

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

      Tech Tips


      • 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%.

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

      • If the 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

      (Air fuel ratio)

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

      O2S B1S2

      (Heated oxygen)

      		 +12.5% Rich Higher than 0.55 V
      -12.5% Lean Below 0.4 V
      Result
      Status of AFS Voltage B1S1 Status of O2S B1S2 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

      • Gas leak from exhaust system

      • Intake system

      • Fuel pressure

      • Mass air flow meter sub-assembly

      • Engine coolant temperature sensor

      • EGR valve assembly
      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

      • EGR valve assembly
      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: While performing Control the Injection Volume for A/F Sensor, the air fuel ratio sensor output voltage (AFS Voltage B1S1) is consistently higher than 3.4 V, and the heated oxygen sensor output voltage (O2S B1S2) is consistently below 0.4 V.

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

      • Lean/Rich: While performing Control the Injection Volume for A/F Sensor, the output voltages of the air fuel ratio sensor or the heated oxygen sensor alternates correctly.

      Tech Tips

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

      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 power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.


      Powertrain > Engine and ECT > 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)


    1. Connect the GTS to the DLC3.

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

    3. Put the engine in inspection mode (maintenance mode).

      Click here


      Powertrain > Hybrid Control > Utility
      Tester Display
      Inspection Mode

    4. Start the engine.

    5. Enter the following menus: Powertrain / Engine and ECT / Data List / MAF, Coolant Temp and Engine Speed.


      Powertrain > Engine and ECT > Data List
      Tester Display
      Engine Speed
      MAF
      Coolant Temp

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

    7. Read MAF with the engine speed at 2500 rpm.

      Tech Tips

      During charging control, the engine speed is set at idle. Therefore, the engine speed does not increase when depressing the accelerator pedal. In this case, read the Data List after charging control has completed.

      Standard
      GTS Display Condition Specified Condition
      MAF

      Shift lever position: P

      A/C: Off

      Engine Speed: 2500 rpm

      		 Between 6.0 gm/sec and 11.0 gm/sec
      Result
      Proceed to
      OK
      NG

    NG

    GO TO STEP 25 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 (LOW PRESSURE)


    1. Check the fuel pressure (low pressure).

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 23 Click here

    NG

  17. CHECK FUEL PUMP OPERATION (LOW PRESSURE)


    1. Check the fuel pump operation.

      Click here

      Tech Tips

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

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FUEL PUMP (LOW PRESSURE) Click here

    OK

  18. CHECK FUEL LEAK (LOW PRESSURE SIDE)


    1. Check for fuel leaks (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 (LOW PRESSURE SIDE)

  19. INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)


    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)


    1. Disconnect the air fuel ratio sensor 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
      F52-1 (HA1A) - F6-23 (HA1A) Always Below 1 Ω
      F52-3 (A1A+) - F6-133 (A1A+) Always Below 1 Ω
      F52-4 (A1A-) - F6-134 (A1A-) Always Below 1 Ω
      F52-1 (HA1A) or F6-23 (HA1A) - Body ground and other terminals Always 10 kΩ or higher
      F52-3 (A1A+) or F6-133 (A1A+) - Body ground and other terminals Always 10 kΩ or higher
      F52-4 (A1A-) or F6-134 (A1A-) - 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. CHECK WHETHER DTC OUTPUT RECURS (DTC P0171, P0172, P1170 OR P117B)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

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

    6. Turn the power switch on (IG).

    7. Turn the GTS on.

    8. Put the engine in inspection mode (maintenance mode).

      Click here


      Powertrain > Hybrid Control > Utility
      Tester Display
      Inspection Mode

    9. Start the engine and warm it up.

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

    11. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    12. Read the DTCs.


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

    B

    END

    A

  23. PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Put the engine in inspection mode (maintenance mode).

      Click here


      Powertrain > Hybrid Control > Utility
      Tester Display
      Inspection Mode

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

      Tech Tips

      The A/C switch and all accessory switches should be off.

    6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position / Data List / MAP and Throttle Idle Position.


      Powertrain > Engine and ECT > Active Test
      Active Test Display
      Control the EGR Step Position
      Data List Display
      MAP
      Throttle Idle Position

    7. Confirm that the Throttle Idle Position is ON and check the MAP values in the Data List while performing the Active Test.

      Note


      • Do not leave the EGR valve open for 10 seconds or more during the Active Test.

      • Be sure to return the EGR valve to step 0 when the Active Test is completed.

      • Do not open the EGR valve 26 steps or more during the Active Test.

      OK
      MAP change in response to EGR step position when Throttle Idle Position is ON in Data List.
      Standard
      - EGR Step Position (Active Test)
      0 Steps 0 to 26 Steps

      MAP

      (Data List)

      		 (EGR valve is fully closed) MAP value is at least +10 kPa (75 mmHg) higher than when EGR valve is fully closed

      Tech Tips


      • While performing the Active Test, if the increase in the value of MAP is small, the EGR valve assembly may be malfunctioning.

      • Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of MAP may occur while performing the Active Test. However, the amount that the value of MAP increases will be smaller than normal.

      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 25 Click here

    NG

  24. INSPECT EGR VALVE ASSEMBLY


    1. Remove the EGR valve assembly.

      Click here

    2. Check if the EGR valve is stuck open.

      OK
      EGR valve is tightly closed.

      Tech Tips

      Perform "Inspection After Repair" after replacing the EGR valve assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE EGR VALVE ASSEMBLY Click here

    OK

  25. CHECK 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

  26. CHECK WHETHER DTC OUTPUT RECURS (DTC P0171, P0172, P1170 OR P117B)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

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

    6. Turn the power switch on (IG).

    7. Turn the GTS on.

    8. Put the engine in inspection mode (maintenance mode).

      Click here


      Powertrain > Hybrid Control > Utility
      Tester Display
      Inspection Mode

    9. Start the engine and warm it up.

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

    11. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    12. Read the DTCs.


      Powertrain > Engine and ECT > Trouble Codes
      Result
      Result Proceed to
      DTC P0171, P0172, P1170 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)


    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
      F38-5 (VG) - F6-91 (VG) Always Below 1 Ω
      F38-4 (E2G) - F6-92 (E2G) Always Below 1 Ω
      F38-5 (VG) or F6-91 (VG) - 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 result of the inspection 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. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Powertrain > Engine and ECT > Clear DTCs

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

    6. Turn the power switch on (IG).

    7. Turn the GTS on.

    8. Put the engine in inspection mode (maintenance mode).

      Click here


      Powertrain > Hybrid Control > Utility
      Tester Display
      Inspection Mode

    9. Start the engine and warm it up.

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

    11. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    12. Read the DTCs.


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

    A

    END

    B

    REPLACE ECM Click here