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Home >> Infiniti >> 2017 >> QX30 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (2 Of 5) >> DTC/Circuit Diagnosis >> DTC P0089: Quantity Control Valve >> Diagnosis Procedure >> Diagnostic Test

Diagnostic Test

  1. START ENGINE

    Start the engine and let it idle.

    Is it difficult to keep at idle?

    YES 

    GO TO STEP 4  .

    NO 

    GO TO STEP 2  .

  2. CHECK FUEL PRESSURE AND TEMPERATURE SENSOR SIGNAL

    G-20 With CONSULT

    1. Warm the engine up to engine coolant temperature reaches 75°C (167°F).
    2. On CONSULT screen, select "ENGINE" >> "ACTIVE TEST" >> "CHECK FUEL PRESS AND TEMP SENSOR".
    3. Keep the engine speed between 500 - 1, 000 RPM.
    4. Perform the Active Test.
      NOTE:

      When start the test, fuel pump is activated and quantity control valve is not activated.

    5. Check that the displayed value of "RAIL PRES (ACTUAL VALUE)" is between 300 kPa (3 bar, 3.06 kg/cm2 , 43.5 psi) and 1200 kPa (12 bar, 12.24 kg - cm2 , 174 psi).

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    GO TO STEP 6  .

  3. ERASE DTC

    1. Erase the DTC.
    2. Turn ignition switch OFF and wait at least 30 seconds.
    3. Start the engine and let it idle for 60 seconds.
    4. Turn ignition switch OFF.
    5. Turn ignition switch ON.
    6. Check DTC.

    Is the DTC detected again?

    YES 

    Check intermittent incident. Refer to INTERMITTENT INCIDENT .

    NO 

    INSPECTION END

  4. PRECONDITIONING FOR CHECKING FUEL PRESSURE AND TEMPERATURE SENSOR OUTPUT SIGNAL

    CAUTION:

    Refer to PRECAUTION FOR RISK OF EXPLOSION AND INJURY for work in safety.

    G-20 With CONSULT

    1. On CONSULT screen, select "ENGINE" >> "DATA MONITOR" >> "RAIL PRES (ACTUAL VALUE)".
    2. Turn ignition switch OFF and wait at least 30 seconds.
    3. Slightly loosen the threaded connection of the fuel line to the fuel rail to reduce the fuel pressure.
      CAUTION:

      Collect escaping fuel with several rags.

    4. Wait at least 60 seconds.
    5. Retighten the threaded connection of fuel line.
    6. Check that the displayed value of "RAIL PRES (ACTUAL VALUE)" is between 0 kPa (0 bar, 0 kg/cm2 , 0 psi) and 300 kPa (3 bar, 3.06 kg/cm2 , 43.5 psi).

    GO TO STEP 5  .

  5. CHECK FUEL PRESSURE AND TEMPERATURE SENSOR SIGNAL

    G-20 With CONSULT

    1. Turn ignition switch ON.
    2. On CONSULT screen, select "ENGINE" >> "ACTIVE TEST" >> "CHECK FUEL PRESS AND TEMP SENSOR".
      NOTE:

      When start the test, fuel pump is activated and quantity control valve is not activated.

    3. Check that the displayed value of "RAIL PRES (ACTUAL VALUE)" is between 300 kPa (3 bar, 3.06 kg/cm2 , 43.5 psi) and 1200 kPa (12 bar, 12.24 kg/cm2 , 174 psi).

    Is the inspection result normal?

    YES 

    GO TO STEP   9  .

    NO 

    GO TO STEP 6  .

  6. CHECK POWER SUPPLY OF FUEL PRESSURE AND TEMPERATURE SENSOR

    1. Turn ignition switch OFF.
    2. Disconnect fuel pressure and temperature sensor harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between fuel pressure and temperature sensor harness connector and ground.
      Fuel pressure and temperature sensor Voltage
      Connector + -
      Terminal
      F139 4 1 4.75 - 5.25 V

    Is the measured value OK?

    YES 

    GO TO STEP 8  .

    NO 

    GO TO STEP 7  .

  7. CHECK FUEL PRESSURE AND TEMPERATURE SENSOR POWER SUPPLY AND GROUND CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between ECM harness connector and fuel pressure and temperature sensor harness connector.
      + - Continuity
      ECM Fuel pressure and temperature sensor
      Connector Terminal Connector Terminal
      F149 12 F139 1 Existed
      18 4
    4. Also check harness for short to power and short to ground.

    Is the inspection result normal?

    YES 

    Check ECM power supply circuit. Refer to DIAGNOSIS PROCEDURE .

    NO 

    Repair or replace error-detected parts.

  8. CHECK FUEL PRESSURE AND TEMPERATURE SENSOR SIGNAL CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between ECM harness connector and fuel pressure and temperature sensor harness connector.
      + - Continuity
      ECM Fuel pressure and temperature sensor
      Connector Terminal Connector Terminal
      F149 65 F139 3 Existed
      67 2
    4. Also check harness for short to power and short to ground.

    Is the inspection result normal?

    YES 

    Replace fuel pressure and temperature sensor. Refer to REMOVAL AND INSTALLATION .

    NO 

    Repair or replace error-detected parts.

  9. CHECK HIGH PRESSURE FUEL SYSTEM LEAK

    G-20 With CONSULT

    1. Start the engine and warm it up to engine coolant temperature reaches 75°C (167°F).
    2. Turn ignition switch OFF.
    3. Turn ignition switch ON.
    4. On CONSULT screen, select "ENGINE" >> "ACTIVE TEST" >> "CHECK FUEL HI PRESS CIRC FOR LEAKTIGHTNESS".
    5. Connect charger to battery.
    6. Set the vehicle to the following conditions.
      Item Condition
      Engine coolant temperature 75 - 105°C (167 - 221°F)
      Fuel temperature 40 - 80°C (104 - 176°F)
      Engine speed 550 - 800 RPM
      Electrical load OFF
    7. Check that the displayed value of "RAIL PRES (ACTUAL VALUE)" is between 19 MPa (190 bar, 193.8 kg/cm2 , 2755 psi) and 21 MPa (210 bar, 214.2 kg/cm2 , 3045 psi).
    8. Perform the Active Test.
      CAUTION:

      Never turn ignition switch OFF.

      NOTE:

      When the result is normal, the fuel rail pressure value must not drop below 10 MPa (100 bar, 102 kg/cm2 , 1450 psi) within 3 minutes.

    Is the inspection result normal?

    YES 

    GO TO STEP 10  .

    NO 

    Check high pressure fuel line for fuel leak.

  10. CHECK QUANTITY CONTROL VALVE FUNCTION

    G-20 With CONSULT

    1. Check that low fuel pressure system is normal.
    2. Set the vehicle to the following conditions.
      Item Condition
      Engine coolant temperature 75 - 105°C (167 - 221°F)
      Fuel temperature 40 - 80°C (104 - 176°F)
      Engine speed 50 RPM or more
      A/C OFF
    3. On CONSULT screen, select "ENGINE" >> "ACTIVE TEST" >> "CHECK QUANTITY CONTROL VALVE".
    4. Perform the Active Test.
      NOTE:

      When the result is normal, the fuel rail pressure value is increased to approximately 20 MPa (200 bar, 204 kg/cm2 , 2900 psi).

    Is the inspection result normal?

    YES 

    GO TO STEP 13  .

    NO 

    GO TO STEP 11  .

  11. CHECK QUANTITY CONTROL VALVE

    Check quantity control valve. Refer to COMPONENT INSPECTION (QUANTITY CONTROL VALVE) .

    Is the inspection result normal?

    YES 

    GO TO STEP 12  .

    NO 

    Replace high pressure fuel pump. Refer to REMOVAL AND INSTALLATION .

  12. CHECK QUANTITY CONTROL VALVE CONTROL CIRCUIT

    1. Disconnect ECM harness connector and quantity control valve harness connector.
    2. Check the continuity between ECM harness connector and quantity control valve harness connector.
      + - Continuity
      ECM Quantity control valve
      Connector Terminal Connector Terminal
      F149 75 F169 1 Existed
      76 2
    3. Also check harness for short to ground.

    Is the inspection result normal?

    YES 

    Check intermittent incident. Refer to INTERMITTENT INCIDENT .

    NO 

    Repair or replace error-detected parts.

  13. ERASE DTC

    1. Check the following.
      • If the actuation angle of the quantity control valve matches the specified value exactly, synchronization between the camshaft and crankshaft must be checked. (Substitute value in emergency mode)
      • If DTC related to camshaft is detected, perform trouble diagnosis for the detected DTC.
      • If DTC related to crankshaft is detected, perform trouble diagnosis for the detected DTC.
    2. Erase the DTC.
    3. Turn ignition switch OFF and wait at least 30 seconds.
    4. Start the engine and let it idle for 60 seconds.
    5. Check DTC.

    Is the DTC detected again?

    YES 

    Check intermittent incident. Refer to INTERMITTENT INCIDENT .

    NO 

    INSPECTION END

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