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HOMESERVICE MANUALSNISSAN-DATSUN2004ALTIMA S, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROL SYSTEM - 2.5LDTC P0340: CMP SENSOR (PHASE)DIAGNOSTIC PROCEDURE
2004 Nissan-Datsun Altima S, Automatic

Diagnostic Procedure

2004 Nissan-Datsun Altima S, AutomaticSECTION 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

    1. Yes : GO TO 2.
    2. No : Check starting system. (Refer to STARTERS .)
  2. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten three ground screws on the body. Refer to "GROUND INSPECTION ".
      Fig 1: Checking CMP Sensor Ground Connections
      G02884421Courtesy 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.
    2. Turn ignition switch ON.
      Fig 2: Disconnecting Camshaft Position Sensor (PHASE) Harness Connector
      G02884422Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between CMP sensor (PHASE) terminal 1 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

    1. OK : GO TO  5.
    2. NG : GO TO 4.
      Fig 3: Checking Voltage Between CMP Sensor (PHASE) Terminal 1 & Ground
      G02884423Courtesy of NISSAN MOTOR CO., U.S.A.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E20, F32
    • 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 3 and 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 connector F58, M70
    • Harness for open or short between CMP sensor (PHASE) and engine 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 13 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

    1. OK : GO TO 8.
    2. 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

    1. OK : GO TO 9.
    2. NG : Replace camshaft position sensor (PHASE).
  9. 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 10.
    2. NG : Remove debris and clean the signal plate of camshaft rear end or replace camshaft.
      Fig 4: Identifying Camshaft (Intake)
      G02884424Courtesy of NISSAN MOTOR CO., U.S.A.
  10. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    1. >> INSPECTION END 
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.