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Home >> Infiniti >> 2023 >> QX55 Essential >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (DTC/Circuit Diagnosis) (1 Of 5) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> Electric Intake Valve Timing Control Module >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK FUSE 
    1. Turn ignition switch OFF.
    2. Pull out 15A fuse (No. 61) from IPDM E/R.
    3. Check that 15A fuse is not blowing.

    Is the fuse blown (open)?

    YES

    Replace the fuse after repairing the applicable circuit.

    NO

    GO TO 2.

  2. CHECK FUSIBLE LINK 
    1. Turn ignition switch OFF.
    2. Check that the following fusible link is not blowing.

      Fusible link No.

      Capacity

      #X

      40A

    Is the fusible link blown (open)?

    YES

    Replace the fusible link after repairing the applicable circuit.

    NO

    GO TO 3.

  3. CHECK GROUND CONNECTION 

    Check ground connection E15. Refer to Ground Inspection in Circuit Inspection .

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Repair or replace error-detected parts.

  4. CHECK ELECTRIC INTAKE VALVE TIMING CONTROL MODULE GROUND CIRCUIT 
    1. Disconnect electric intake valve timing control module harness connectors.
    2. Check the continuity between electric intake valve timing control module harness connector and ground.

      Electric intake valve timing control module

      --

      Continuity

      Connector

      Terminal

      F91

      42

      Ground

      Existed
    3. Also check harness for short to power.

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Repair or replace error-detected parts.

  5. CHECK ELECTRIC INTAKE VALVE TIMING CONTROL MODULE POWER SUPPLY 
    1. Reconnect electric intake valve timing control module harness connectors.
    2. Check the voltage between electric intake valve timing control module harness connector terminals as follows.

      Electric intake valve timing control module

      Voltage

      Connector

      +

      -

      Terminal

      F91

      48

      42

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 6.

    NO

    Perform trouble diagnosis for power supply circuit.

  6. CHECK IGNITION SWITCH SIGNAL 

    Check the voltage between electric intake valve timing control module harness connectors as follows.

    Electric intake valve timing control module

    Condition

    Voltage

    +

    -

    Connector

    Terminal

    Terminal

    F91

    40

    42

    Ignition switch: ON

    Battery voltage

    Ignition switch: OFF

    0 V

    Is the inspection result normal?

    YES

    Check intermittent incident. Refer to Intermittent Incident .

    NO

    GO TO 7.

  7. CHECK IGNITION SWITCH SIGNAL 
    1. Turn ignition switch OFF.
    2. Disconnect electric intake valve timing control module harness connectors.
    3. Disconnect IPDM E/R harness connector.
    4. Check the continuity between IPDM E/R harness connector and electric intake valve timing control module harness connector.

      IPDM E/R

      Electric intake valve timing control module

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E121

      43

      F91

      40

      Existed
    5. Also check harness for short to power and short to ground.

    Is the inspection result normal?

    YES

    Perform trouble diagnosis for power supply circuit.

    NO

    Repair or replace error-detected parts.

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