2004 Infiniti I35FACTORY OEM SERVICE PROCEDURE

Diagnostic Procedure

  1. CHECK VEHICLE SPEED SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector and combination meter harness connector M32.
    3. Check harness continuity between ECM terminal 68 and combination meter terminal 32. Refer to Wiring Diagram.

      Continuity should exist. 

    4. Also check harness for short to power.

    OK or NG 

    1. OK: GO TO  3 .
    2. NG: GO TO 2.
  2. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M229, F66
    • Harness for open or short between ECM and combination meter
    1. : Repair open circuit or short to ground or short to power in harness or connectors.
  3. CHECK COMBINATION METER FUNCTION 

    Make sure that speedometer functions properly.

    OK or NG 

    1. OK: GO TO  5 .
    2. NG: GO TO 4.
  4. CHECK COMBINATION METER CIRCUIT FOR OPEN AND SHORT 

    Check the following.

    • Harness connectors M15, E81
    • Harness connectors M230, F67
    • Harness connectors F65, F114
    • Harness for open or short between combination meter and vehicle speed sensor
    • Harness for open or short between combination meter and ABS/TCS control unit
    • Harness for open or short between vehicle speed sensor and ECM
    • Harness for open or short between vehicle speed sensor and TCM (Transmission control module)

      OK or NG 

    1. OK: Check combination meter and vehicle speed sensor or ABS/TCS control unit. Refer to EL section.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
  5. 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.

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