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Home >> Infiniti >> 2024 >> QX55 Essential >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTC/Circuit Diagnosis) (1 Of 4) >> 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)?

    >>

    Replace the fuse after repairing the applicable circuit.

    >>

    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)?

    >>

    Replace the fusible link after repairing the applicable circuit.

    >>

    GO TO 3.

  3. CHECK GROUND CONNECTION 

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

    Is the inspection result normal?

    >>

    GO TO 4.

    >>

    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?

    >>

    GO TO 5.

    >>

    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?

    >>

    GO TO 6.

    >>

    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?

    >>

    Check intermittent incident. Refer to Intermittent Incident .

    >>

    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?

    >>

    Perform trouble diagnosis for power supply circuit.

    >>

    Repair or replace error-detected parts.

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