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Home >> Infiniti >> 2004 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System >> DTC P0340: Camshaft Position (CMP) Sensor (Phase) >> Diagnostic Procedure
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Diagnostic Procedure

  1. CHECK STARTING SYSTEM 

    Turn ignition switch to START position.

    Does the engine turn over?

    Does the starter motor operate?

    Yes or No

    Yes: GO TO 2.

    No: Check starting system. (Refer to STARTING SYSTEM .

  2. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten ground three screws on the body.
      Fig 1: Locating Body Ground
      G02691395Courtesy of NISSAN MOTOR CO., U.S.A.

      Refer to GROUND INSPECTION .

    OK or NG

    OK: GO TO 3.

    NG: Repair or replace ground connections.

  3. CHECK CAMSHAFT POSITION (CMP) SENSOR (PHASE) POWER SUPPLY CIRCUIT 
    1. Disconnect camshaft position (CMP) sensor (PHASE) harness connector.
    2. Turn ignition switch ON.
    3. Check voltage between CMP sensor (PHASE) terminal 3 and ground with CONSULT-II or tester.

      Voltage: Battery voltage

    4. Also check harness for short to ground and short to power.

    OK or NG

    OK: GO TO  5.

    NG: GO TO 4.

    Fig 2: Locating Camshaft Position (CMP) Sensor (PHASE)
    G02691396Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 3: Checking Voltage Between CMP Sensor (PHASE) Terminal 3 & Ground
    G02691397Courtesy of NISSAN MOTOR CO., U.S.A.
  4. DETECT MALFUNCTIONING PART 
    • Check the following.
    • Harness connectors F33, E19
    • Harness for open or short between camshaft position sensor (PHASE) and ECM
    • Harness for open or short between camshaft position sensor (PHASE) and IPDM E/R

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

  5. CHECK CMP SENSOR (PHASE) GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Check harness continuity between CMP sensor (PHASE) terminal 1 and body ground.

      Continuity should exist.

    3. Also check harness for short to power.

    OK or NG

    OK: GO TO  7.

    NG: GO TO 6.

  6. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F32, E2
    • Harness for open or short between CMP sensor (PHASE) and body ground

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

  7. CHECK CMP SENSOR (PHASE) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminal 14 and CMP sensor (PHASE) terminal 2. Refer to Wiring Diagram.

      Continuity should exist.

    3. Also check harness for short to ground or short to power.

    OK or NG

    OK: GO TO 8.

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

  8. CHECK CAMSHAFT POSITION SENSOR (PHASE) 

    Refer to COMPONENT INSPECTION .

    OK or NG

    OK: GO TO 9.

    NG: Replace camshaft position sensor (PHASE).

  9. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    : INSPECTION END

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