Engine Coolant Temperature Signal Inspection

Symptom: Water temperature gauge 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 "W TEMP METER" on "DATA MONITOR", compare the value of "DATA MONITOR" with water temperature gauge pointer of combination meter.
      TEMPERATURE SPECIFICATION
      
      

      Water temperature gauge pointer	Reference value of data monitor [°C (°F)]
      Hot	Approx. 130 (266)
      Middle	Approx. 70 - 105 (158 - 221)
      Cold	Approx. 50 (122)

   OK or NG 

   OK : GO TO 2.

   NG : Replace combination meter.

   Fig 1: Inspecting Engine Coolant Temperature

   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 "COOLANT TEMP/S" on "DATA MONITOR", print out the CONSULT-II screen.
   3. Select "METER A/C AMP" on CONSULT-II.
   4. Using "W TEMP METER" on "DATA MONITOR", compare the value of "DATA MONITOR" with that of the "COOLANT TEMP/S".

   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.