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Home >> Infiniti >> 2024 >> Q50 Luxe, RWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (2 Of 2) >> Component Parts/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. Disconnect 15A fuse (No. 49) from IPDM E/R.
    3. Check that 15A fuse is not blowing.

    Is the fuse blown (open)?

    YES>>

    Replace the fuse. [Check the power supply if fuse is blown (open) again.]

    NO>>

    GO TO 2.

  2. CHECK FUSIBLE LINK 
    1. Turn ignition switch OFF.
    2. Check that the following fusible link is not blowing.
      Location Fuse No. Capacity
      Fuse and fusible link holder-1 #V 50A
      #W 50A

    Is the fusible link blown (open)?

    YES>>

    Replace the fuse. [Check the power supply if fusible link is blown (open) again.]

    NO>>

    GO TO 3.

  3. CHECK GROUND CONNECTION 

    Check ground connection E191. Refer to Ground Inspection in 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.
      + - Continuity
      Electric intake valve timing control module
      Connector Terminal
      E154 41 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
      E154 39 41 Battery voltage
      40

    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 Connector Terminal
    E153 28 E154 41 Ignition switch: ON Battery voltage
    Ignition switch: OFF 0 V

    Is the inspection result normal?

    YES>>

    Check intermittent incident. Refer to Inspection .

    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.
      + - Continuity
      IPDM E/R Electric intake valve timing control module
      Connector Terminal Connector Terminal
      E123 55 E153 28 Existed
    5. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES>>

    Perform trouble diagnosis for power supply circuit.

    NO>>

    Repair or replace error-detected parts.

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