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Engine Speed Signal Inspection

WARNING: This page is about a different car, the 2008 Infiniti M45 and 2008 Infiniti M35. However, it is still accessible from the selected car via links, so may be relevant.

Symptom: Tachometer indication is malfunction.

  1. CHECK UNIFIED METER AND A/C AMP. INPUT SIGNAL 
    1. Start engine and select "METER A/C AMP" on CONSULT-III.
    2. Using "TACHO METER" on "DATA MONITOR", compare the value of "DATA MONITOR" to that of tachometer of combination meter.

    Is the value in tachometer almost same as the value in the monitor? 

    OK: GO TO 2.

    NG: Replace combination meter. (Perform self-diagnosis of ECM when the value in the monitor indicates 8191.875 rpm. Then repair or replace the malfunction part.)

  2. CHECK ECM OUTPUT SIGNAL 
    1. Select "ENGINE" on CONSULT-III.
    2. Using "ENG SPEED" on "DATA MONITOR", print out the CONSULT-III screen when the engine is idling.
    3. Select "METER A/C AMP" on CONSULT-III.
    4. Using "TACHO METER" on "DATA MONITOR", compare the value of "DATA MONITOR" of the idling speed to that of the "ENG SPEED".

    OK or NG 

    OK: Perform self-diagnosis of ECM. Refer to "CONSULT-III FUNCTION (ENGINE) " (for VQ35DE) or "CONSULT-III FUNCTION (ENGINE) " (for VK45DE).

    NG: Replace unified meter and A/C amp.

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