Engine Coolant Temperature Signal Inspection

Symptom: Water temperature gauge 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 "W TEMP METER" on "DATA MONITOR", compare the value of "DATA MONITOR" to the indication of water temperature gauge of combination meter.
      DATA MONITOR VALUES
      
      

      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)

   Is the indication of water temperature gauge 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 215°C (419°F). Then repair or replace the malfunction part.]

2. CHECK UNIFIED METER AND A/C AMP. INPUT SIGNAL 
   1. Select "ENGINE" on CONSULT-III.
   2. Using "COOLAN TEMP/S" on "DATA MONITOR", print out the CONSULT-III screen.
   3. Select "METER A/C AMP" on CONSULT-III.
   4. Using "W TEMP METER" on "DATA MONITOR", compare the value of "DATA MONITOR" to that of the "COOLAN TEMP/S".

   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.