Engine 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: Tachometer indication is malfunction.

CHECK COMBINATION METER INPUT SIGNAL
1. Connect CONSULT-III, and start engine.
2. Select "METER A/C AMP" on CONSULT-III.
3. Using "TACHO METER" on "DATA MONITOR", compare the value of "DATA MONITOR" with tachometer pointer of combination meter.
  OK or NG
  
  OK: GO TO 2.
  
  NG: Replace combination meter.
CHECK UNIFIED METER AND A/C AMP. INPUT 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 with that of the "ENG SPEED".
OK or NG

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

NG: Replace unified meter and A/C amp. Refer to "REMOVAL AND INSTALLATION OF UNIFIED METER AND A/C AMP. ".