Engine Speed Signal Inspection

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-II.
   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.)

   Fig 1: CONSULT-II Display - Data Meter

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. CHECK ECM OUTPUT 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 to that of the "ENG SPEED".

Fig 2: CONSULT-II Display - Data Meter

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

OK or NG 

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

NG: Replace unified meter and A/C amp.