FixVault
Home › Nissan-Datsun › 2004 › Frontier Desert Runner SE › Repair and Diagnosis › Engine Performance › Engine Control System - VG33E › DTC P0340: CMP Sensor › Diagnostic Procedure

Diagnostic Procedure

  1. RETIGHTEN GROUND SCREWS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten engine ground screws.

    : GO TO 2.

    Fig 1: Locating Engine Ground Screws
    G00741837Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK CMP SENSOR POWER SUPPLY CIRCUIT 
    1. Disconnect camshaft position (CMP) sensor harness connector.
    2. Turn ignition switch ON.
      Fig 2: Locating Camshaft Position (CMP) Sensor Harness Connector
      G00741838Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between CMP sensor terminal 5 and engine ground with CONSULT-II or tester.

    Voltage: Battery voltage 

    OK or NG 

    1. OK: GO TO  4.
    2. NG: GO TO 3.
    Fig 3: Checking Voltage Between CMP Sensor Terminal 5 And Engine Ground
    G00741839Courtesy of NISSAN MOTOR CO., U.S.A.
  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness for open or short between camshaft position sensor and ECM relay
    • Harness for open or short between camshaft position sensor and ECM

    : Repair harness or connectors.

  4. CHECK CMP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between CMP sensor terminal 4 and ECM terminal 49, CMPS terminal 3 and ECM terminals 44, 48. Refer to WIRING DIAGRAM .

      Continuity should exist. 

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

    OK or NG 

    1. OK: GO TO 5
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
  5. CHECK CMP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Check harness continuity between CMPS terminal 6 and engine ground.

      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 for open between camshaft position sensor and engine ground

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

  7. CHECK CAMSHAFT POSITION SENSOR 
    1. Install any parts removed.
    2. Start engine.
    3. Check voltage between ECM terminals 44, 48 and engine ground, ECM terminal 49 and engine ground with DC range.
    Fig 4: Checking Voltage Between Terminal 44 Or 48, And 49 And Engine Ground
    G00741841Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 5: Terminal 44 Or 48 Voltage Condition Graph
    G00741840Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 6: Terminal 49 Voltage Condition Graph
    G00741842Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 8.
    2. NG: Replace distributor assembly with camshaft position sensor.
  8. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    1. : INSPECTION END 
About FixVault