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Home >> Infiniti >> 2024 >> Q50 Luxe, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (3 Of 7) >> Engine (ECM) >> P0340 CMP Sensor >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

  1. CHECK DTC PRIORITY 

    If DTC P0340 is displayed with DTC P0643, first perform the confirmation procedure (trouble diagnosis) for DTC P0643.

    Is applicable DTC detected?

    YES>>

    Perform diagnosis of applicable. Refer to DTC Description .

    NO>>

    GO TO 2.

  2. CHECK STARTING SYSTEM 

    Turn ignition switch to START position.

    Does the engine turn over? Does the starter motor operate?

    YES>>

    GO TO 3.

    NO>>

    Check starting system. (Refer to Work Flow . For details, Refer to STARTING SYSTEM : Preparation .)

  3. CHECK GROUND CONNECTION 
    1. Turn ignition switch OFF.
    2. Check ground connection E191. Refer to Ground Inspection in Inspection .

    Is the inspection result normal?

    YES>>

    GO TO 4.

    NO>>

    Repair or replace ground connection.

  4. CHECK INTAKE CAMSHAFT POSITION SENSOR POWER SUPPLY 
    1. Disconnect intake camshaft position sensor harness connector.
    2. Turn ignition switch ON.
    3. Check the voltage between intake camshaft position sensor harness connector and ground.
      Intake camshaft position sensor Ground Voltage (V)
      Bank Connector Terminal
      1 F135 1 Ground Approx. 5

    Is the inspection result normal?

    YES>>

    GO TO 5.

    NO>>

    P0340: Repair open circuit, short to ground or short to power in harness or connectors.

  5. CHECK INTAKE CAMSHAFT POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between intake camshaft position sensor harness connector and ECM harness connector.
      Intake camshaft position sensor ECM Continuity
      Bank Connector Terminal Connector Terminal
      1 F135 2 F143 27 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES>>

    GO TO 6.

    NO>>

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

  6. CHECK INTAKE CAMSHAFT POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Check the continuity between intake camshaft position sensor harness connector and ECM harness connector.
      Intake camshaft position sensor ECM Continuity
      Bank Connector Terminal Connector Terminal
      1 F135 3 F143 36 Existed
    2. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES>>

    GO TO 7.

    NO>>

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

  7. CHECK CAMSHAFT POSITION SENSOR 

    Refer to Component Inspection . Is the inspection result normal?

    YES>>

    GO TO 8.

    NO>>

    Replace malfunctioning camshaft position sensor. Refer to CAMSHAFT : Exploded View .

  8. CHECK CAMSHAFT (INTAKE) 

    Check the following.

    BANK 1

    • Accumulation of debris to the signal plate of camshaft rear end
    • Chipping signal plate of camshaft rear end
      GNSDB148781Courtesy of NISSAN NORTH AMERICA, INC.

    BANK 2

    • Accumulation of debris to the signal plate of camshaft rear end
    • Chipping signal plate of camshaft rear end
      GNSDB108792Courtesy of NISSAN NORTH AMERICA, INC.

    Is the inspection result normal?

    YES>>

    INSPECTION END

    NO>>

    Remove debris and clean the signal plate of camshaft rear end or replace camshaft. Refer to CAMSHAFT : Exploded View .

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