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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 Injector >> 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 INJECTOR POWER SUPPLY

    1. Turn ignition switch OFF.
    2. Disconnect fuel injector harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between fuel injector harness connector and ground.
      Fuel injector Ground Voltage
      Cylinder Connector Terminal
      1 F30 1 Ground Battery voltage
      2 F18 1
      3 F41 1
      4 F20 1
      5 F42 1
      6 F22 1

    Is the inspection result normal?

    YES 

    GO TO STEP 3. 

    NO 

    GO TO STEP 2. 

  2. CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R harness connector.
    3. Check the continuity between fuel injector harness connector and IPDM E/R harness connector.
    Fuel injector IPDM E/R Continuity
    Cylinder Connector Terminal Connector Terminal
    1 F30 1 F19 54 Existed
    2 F18 1 60
    3 F41 1 54
    4 F20 1 60
    5 F42 1 54
    6 F22 1 60

    Is the inspection result normal?

    YES 

    Perform the trouble diagnosis for power supply circuit.

    NO 

    Repair or replace error-detected parts.

  3. CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between fuel injector harness connector and ECM harness connector.
      Fuel injector ECM Continuity
      Cylinder Connector Terminal Connector Terminal
      1 F30 2 F78 17 Existed
      2 F18 2 16
      3 F41 2 22
      4 F20 2 12
      5 F42 2 11
      6 F22 2 21
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

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

  4. CHECK FUEL INJECTOR

    Check fuel injector. Refer to COMPONENT INSPECTION .

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    Replace malfunctioning fuel injector. Refer to REMOVAL AND INSTALLATION .

  5. 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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