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-II.
   2. Using "W TEMP METER" on "DATA MONITOR", compare the value of "DATA MONITOR" with water temperature gauge pointer of combination meter.
   DIAGNOSIS PROCEDURE
   
   

   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)

   Fig 1: CONSULT-II Diagnosis Function Display (3 Of 5)

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

   OK or NG 

   1. OK: GO TO 2.
   2. NG: Replace combination meter.
2. CHECK UNIFIED METER AND A/C AMP. INPUT SIGNAL 
   1. Select "ENGINE" on CONSULT-II.
   2. Using "COOLAN 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 "COOLAN TEMP/S".

   OK or NG 

   1. OK: Perform ECM self-diagnosis. Refer to "CONSULT-II FUNCTION (ENGINE) " (for VQ35DE) or "CONSULT-II FUNCTION (ENGINE) " (for VK45DE).
   2. NG: Replace unified meter and A/C amp. Refer to "REMOVAL AND INSTALLATION OF UNIFIED METER AND A/C AMP. ".
   Fig 2: CONSULT-II Diagnosis Function Display (4 Of 5)

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