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Home >> Infiniti >> 2015 >> QX60 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 116 (Engine Control System (DTC/Circuit Diagnosis) (VQ35DE) (Except Hybrid) (3 Of 3)) >> DTC/Circuit Diagnosis >> Fuel Pump >> Diagnosis Procedure >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

  1. CHECK FUEL PUMP RELAY POWER SUPPLY-I

    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between ECM harness connector terminals.
      ECM Voltage
      + -
      Connector Terminal Connector Terminal
      F78 19 E32 152 Battery voltage

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    GO TO STEP 2  .

  2. CHECK FUEL PUMP RELAY POWER SUPPLY-II

    Check the voltage between IPDM E/R harness connector and ground.

    IPDM E/R Ground Voltage
    Connector Terminal
    F24 69 Ground Battery voltage

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    GO TO STEP   11  .

  3. CHECK FUEL PUMP RELAY POWER SUPPLY CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R harness connector.
    3. Check the continuity between ECM harness connector and IPDM E/R harness connector.
    ECM IPDM E/R Continuity
    Connector Terminal Connector Terminal
    F78 19 F24 69 Existed

    Is the inspection result normal?

    YES 

    Perform the trouble diagnosis for power supply circuit.

    NO 

    Repair or replace error-detected parts.

  4. CHECK CONDENSER-2 POWER SUPPLY

    1. Turn ignition switch OFF.
    2. Reconnect all harness connectors disconnected.
    3. Disconnect condenser-2 harness connector.
    4. Turn ignition switch ON.
    5. Check the voltage between condenser-2 harness connector and ground.
      Condenser-2 Ground Voltage
      Connector Terminal
      B52 1 Ground Battery voltage should exist for 1 second after ignition switch is turned ON.

    Is the inspection result normal?

    YES 

    GO TO STEP 6  .

    NO 

    GO TO STEP 5  .

  5. CHECK CONDENSER-2 POWER SUPPLY CIRCUIT

    1. Disconnect IPDM E/R harness connector.
    2. Check the continuity between IPDM E/R harness connector and condenser-2 harness connector.
      IPDM E/R Condenser-2 Continuity
      Connector Terminal Connector Terminal
      E121 15 B52 1 Existed
    3. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP   11  .

    NO 

    Perform the trouble diagnosis for power supply circuit.

  6. CHECK CONDENSER-2 GROUND CIRCUIT

    1. Turn ignition switch OFF.
    2. Check the continuity between condenser-2 harness connector and ground.
      Condenser-2 Ground Continuity
      Connector Terminal
      B52 2 Ground Existed
    3. Also check harness for short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 7  .

    NO 

    Repair open circuit or short to power in harness or connectors.

  7. CHECK CONDENSER-2

    Check condenser-2. Refer to COMPONENT INSPECTION (CONDENSER-2) .

    Is the inspection result normal?

    YES 

    GO TO STEP 8  .

    NO 

    Replace condenser-2.

  8. CHECK FUEL PUMP POWER SUPPLY CIRCUIT

    1. Disconnect "fuel level sensor unit and fuel pump" harness connector.
    2. Check harness continuity between IPDM E/R harness connector and "fuel level sensor unit and fuel pump" harness connector.
      IPDM E/R Fuel level sensor unit and fuel pump Continuity
      Connector Terminal Connector Terminal
      E121 15 B72 6 Existed

    Is the inspection result normal?

    YES 

    GO TO STEP 9  .

    NO 

    Repair open circuit or short to power in harness or connectors.

  9. CHECK FUEL PUMP GROUND CIRCUIT

    1. Disconnect "fuel level sensor unit and fuel pump" harness connector.
    2. Check the continuity between "fuel level sensor unit and fuel pump" harness connector and ground.
      Fuel level sensor unit and fuel pump Ground Continuity
      Connector Terminal
      B72 4 Ground Existed

    Is the inspection result normal?

    YES 

    GO TO STEP 10  .

    NO 

    Repair open circuit or short to power in harness or connectors.

  10. CHECK FUEL PUMP

    Check fuel pump. Refer to COMPONENT INSPECTION (FUEL PUMP) .

    Is the inspection result normal?

    YES 

    GO TO STEP 11  .

    NO 

    Replace fuel pump. Refer to REMOVAL AND INSTALLATION .

  11. CHECK INTERMITTENT INCIDENT

    Check intermittent incident. Refer to INTERMITTENT INCIDENT .

    Is the inspection result normal?

    YES 

    Replace IPDM E/R. Refer to REMOVAL AND INSTALLATION .

    NO 

    Repair or replace error-detected parts.

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