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Home >> Infiniti >> 2005 >> Q45 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U1000 To P0430 >> DTC P0335: CKP Sensor (Pos) >> Diagnostic Procedure

Diagnostic Procedure

  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten three ground screws on the body. Refer to "GROUND INSPECTION ".
    Fig 1: Locating Three Ground Screws On Body
    G02369413Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 2.
    2. NG: Repair or replace ground connections.
  2. CHECK CRANKSHAFT POSITION (CKP) SENSOR (POS) POWER SUPPLY CIRCUIT 
    1. Disconnect crankshaft position (CKP) sensor (POS) harness connector.
    2. Turn ignition switch ON.
      Fig 2: Disconnecting Crankshaft Position (CKP) Sensor (POS) Harness Connector
      G02369414Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between CKP sensor (POS) terminal 3 and ground with CONSULT-II or tester.
      1. Voltage: Battery voltage 
    4. Also check harness for short to ground and short to power.

    OK or NG 

    1. OK: GO TO  4.
    2. NG: GO TO 3.
    Fig 3: Checking Voltage Between CKP Sensor (POS) Terminal 3
    G02369415Courtesy of NISSAN MOTOR CO., U.S.A.
  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M135, F105
    • Harness connectors F33, E33
    • Harness connectors E35, E305
    • Harness for open or short between crankshaft position sensor (POS) and ECM
    • Harness for open or short between crankshaft position sensor (POS) and ECM relay
      1. Repair open circuit or short to ground or short to power in harness or connectors.
  4. CHECK CKP SENSOR (POS) GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Check harness continuity between CKP sensor (POS) terminal 1 and ground.

      Refer to WIRING DIAGRAM .

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

    OK or NG 

    1. OK: GO TO  6.
    2. NG: GO TO 5.
  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E305, E35
    • Harness connectors E33, F33
    • Harness connectors E32, F32
    • Harness for open or short between crankshaft position sensor (POS) and ground
      1. Repair open circuit or short to power in harness or connectors.
  6. CHECK CKP SENSOR (POS) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminal 13 and CKP sensor (POS) terminal 2.

      Refer to WIRING DIAGRAM .

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

    OK or NG 

    1. OK: GO TO  8.
    2. NG: GO TO 7.
  7. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E305, E35
    • Harness connectors E33, F33
    • Harness for open or short between crankshaft position sensor (POS) and ECM
      1. Repair open circuit or short to ground or short to power in harness or connectors.
  8. CHECK CRANKSHAFT POSITION SENSOR (POS) 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    1. OK: GO TO 9.
    2. NG: Replace crankshaft position sensor (POS).
  9. CHECK GEAR TOOTH 

    Visually check for chipping signal plate gear tooth.

    OK or NG 

    1. OK: GO TO 10.
    2. NG: Replace the signal plate.
  10. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    1. INSPECTION END 
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