Engine Speed Signal Inspection

Symptom: Tachometer indication is malfunction.

1. CHECK COMBINATION METER INPUT SIGNAL 
   1. Connect CONSULT-II, and start engine.
   2. Select "METER A/C AMP" on CONSULT-II.
   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.

   Fig 1: Identifying Combination Meter

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. CHECK UNIFIED METER AND A/C AMP. INPUT SIGNAL 
   1. Select "ENGINE" on CONSULT-II.
   2. Using "ENG SPEED" on "DATA MONITOR", print out the CONSULT-II screen when the engine is idling.
   3. Select "METER A/C AMP" on CONSULT-II.
   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-II FUNCTION (ENGINE) " (VQ35DE) or "CONSULT-II FUNCTION (ENGINE) " (VK45DE).

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

   Fig 2: Identifying Unified Meter And A/C Amp

   Courtesy of NISSAN MOTOR CO., U.S.A.