2004 Infiniti I35FACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

  1. RETIGHTEN GROUND SCREWS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten engine ground screws. See Figure .
    1. : GO TO 2.
  2. CHECK CKP SENSOR (POS) POWER SUPPLY CIRCUIT 
    1. Disconnect harness connectors F25, F171.
      Fig 1: Disconnecting Harness Connectors
      G00786780Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Turn ignition switch ON.
    3. Check voltage between harness connector F25 terminal 4 and ground with CONSULT-II or tester.
      Fig 2: Checking Voltage Between Harness Connector F25 Terminal 4 And Ground
      G00786781Courtesy of NISSAN MOTOR CO., U.S.A.
    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.
  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors F25, F171
    • Harness connectors E15, F18
    • Harness for open or short between ECM and harness connector F25
    • Harness for open short between ECM relay and harness connector F25
    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 harness connector F25 terminal 2 and engine ground. Refer to Wiring Diagram.

      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 F25, F171
    • Harness for open between harness connector F25 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 95 and harness connector F25 terminal 1.

      Refer to Wiring Diagram.

      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 F25, F171
    • Harness for open or short between ECM and harness connector F25
    1. : Repair open circuit or short to ground or short to power in harness or connectors.
  8. CHECK CKP SENSOR (POS) SUB-HARNESS CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect CKP sensor (POS) harness connector.
      Fig 3: Identifying CKP Sensor (POS) Sub-Harness Circuit For Open And Short
      G00786782Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Check harness continuity between CKP sensor (POS) terminals and harness connector F171 terminals as follows.
      Fig 4: CKP Sensor (POS) Terminals And Harness Connector F171 Terminals Table
      G00786783Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Also check harness for short to ground and short to power.

      OK or NG 

    1. OK: GO TO 9.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
  9. CHECK CRANKSHAFT POSITION SENSOR (POS) 

    Refer to COMPONENT INSPECTION  .

    OK or NG 

    1. OK: GO TO 10.
    2. NG: Replace crankshaft position sensor (POS).
  10. CHECK GEAR TOOTH 

    Visually check for chipping signal plate gear tooth.

    OK or NG 

    1. OK: GO TO 11.
    2. NG: Replace the signal plate.
  11. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

    1. : INSPECTION END 
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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.