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Vehicle Speed Signal Inspection

WARNING: This page is about a different car, the 2008 Infiniti FX45 and 2008 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.

Symptom: Speedometer and odo/trip meter indication is malfunction.

  1. CHECK COMBINATION METER INPUT SIGNAL 
    1. Connect CONSULT-III, and start engine.
    2. Select "METER A/C AMP" on CONSULT-III.
    3. Using "SPEED METER" on "DATA MONITOR", compare the value of "DATA MONITOR" with speedometer pointer of combination meter.

    OK or NG 

    OK: Perform self-diagnosis of ABS actuator and electric unit (control unit). Refer to "CONSULT-III FUNCTIONS (ABS) ".

    NG: GO TO 2.

  2. CHECK UNIFIED METER AND A/C AMP. OUTPUT SIGNAL 
    1. Drive vehicle at approximately 40 km/h (25 MPH).
    2. Check voltage signal between unified meter and A/C amp. harness connector M56 terminal 26 and ground.
      3. Fig 1: Identifying Voltage Signal Between Unified Meter And A/C Amp. Harness Connector M56 Terminal 26 And Ground
      G04922959Courtesy of NISSAN MOTOR CO., U.S.A.
    NOTE: Maximum voltage may be 5 V due to specifications (connected units).

    26 - Ground: 

    Fig 2: Identifying Voltage Signal Graph
    G04877479Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO 3.

    NG-1 >> If monitor indicates "0 V" constantly, perform the following.

    1. Check each unit inputting vehicle speed signal (8 pulse), harness and connector between each unit and unified meter and A/C amp.
    2. Repair or replace malfunctioning part.

    NG-2 >> If monitor indicates "5 V" or "12 V" constantly, replace unified meter and A/C amp. Refer to "REMOVAL AND INSTALLATION OF UNIFIED METER AND A/C AMP. ".

  3. CHECK CONTINUITY BETWEEN COMBINATION METER AND UNIFIED METER AND A/C AMP. 
    1. Turn ignition switch OFF.
    2. Disconnect combination meter connector and unified meter and A/C amp. connector.
    3. Check continuity between combination meter harness connector M20 terminal 1 and unified meter and A/C amp. harness connector M56 terminal 26.

      1 - 26 : Continuity should exist. 

      Fig 3: Identifying Continuity Between Combination Meter And Unified Meter And A/C Amp
      G05222301Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Replace combination meter.

    NG: Repair harness or connector.

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