LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Nissan-Datsun >> 2004 >> Quest S >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System >> DTC P0340, P0345: CMP Sensor (Phase) >> Diagnostic Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Procedure

  1. CHECK STARTING SYSTEM 
    1. Turn ignition switch to START position.
      1. Does the engine turn over? 
      2. Does the starter motor operate? 

    Yes or No 

    1. Yes: GO TO 2.
    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. Refer to GROUND INSPECTION  .
      Fig 1: Checking Ground Connections
      G00775707Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 3.
    2. 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.
      Fig 2: Disconnecting Camshaft Position (CMP) Sensor (Phase) Harness Connector
      G00775708Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Turn ignition switch ON.
    3. Check voltage between CMP sensor (PHASE) terminal 3 and ground with CONSULT-II or tester.
      Fig 3: Checking Voltage Between CMP Sensor (Phase) Terminal 3 And Ground
      G00775709Courtesy of NISSAN MOTOR CO., U.S.A.
      1. Voltage: Battery voltage 
    4. Also check harness for short to ground and short to power.

    OK or NG 

    1. OK: GO TO  5 .
    2. NG: GO TO 4.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E5, F14
    • Harness connectors F26, F301
    • 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
      1. 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 ground.
      1. Continuity should exist. 
    3. Also check harness for short to power.

    OK or NG 

    1. OK: GO TO  7 .
    2. NG: GO TO 6.
  6. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E5, F14
    • Harness connectors F26, F301
    • Harness for open or short between CMP sensor (PHASE) and ground
      1. 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 33 or 14 and CMP sensor (PHASE) terminal 2.

      Refer to WIRING DIAGRAM  .

      1. Continuity should exist. 
    3. Also check harness for short to ground or short to power.

    OK or NG 

    1. OK: GO TO  9 .
    2. NG: GO TO 8.
  8. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F26, F301
    • Harness for open or short between camshaft position sensor (PHASE) and ECM
      1. Repair open circuit or short to ground or short to power in harness or connectors.
  9. CHECK CAMSHAFT POSITION SENSOR (PHASE) 

    Refer to COMPONENT INSPECTION  .

    OK or NG 

    1. OK: GO TO 10.
    2. NG: Replace camshaft position sensor (PHASE).
  10. CHECK CAMSHAFT (INTAKE) 

    Check the following.

    • Accumulation of debris to the signal plate of camshaft rear end
    • Chipping signal plate of camshaft rear end

    OK or NG 

    1. OK: GO TO 11.
    2. NG: Remove debris and clean the signal plate of camshaft rear end or replace camshaft.
      Fig 4: Checking Camshaft (Intake)
      G00775710Courtesy of NISSAN MOTOR CO., U.S.A.
  11. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

    1. INSPECTION END 
scientia non olet · About LEMON Manuals