Engine Coolant Temperature Signal Inspection

WARNING: This page is about a different car, the 2005 Nissan 350Z. However, it is still accessible from the selected car via links, so may be relevant.

Symptom: Water temperature gauge indication is malfunction.

CHECK UNIFIED METER AND A/C AMP. OUTPUT SIGNAL

Start engine and select "METER A/C AMP" on CONSULT-II.
Using "W TEMP METER" on the "DATA MONITOR", compare the value of "DATA MONITOR" with water temperature gauge pointer of combination meter.

WATER TEMPERATURE GAUGE POINTER - REFERENCE VALUE OF DATA MONITOR

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: Scan Tool Display "Data Monitor Temp Meter"

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

OK or NG

OK : GO TO 2.
NG : Replace combination meter.

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, compare the value of "DATA MONITOR" with that of the "COOLAN TEMP/S".
  
  Fig 2: Scan Tool Display "Data Monitor Coolan Temp"
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK : Perform ECM self-diagnosis. Refer to "CONSULT-II FUNCTION (ENGINE) ".
- NG : Replace unified meter and A/C amp. Refer to "REMOVAL AND INSTALLATION OF UNIFIED METER AND A/C AMP. ".