Engine Coolant Temperature Signal Inspection

WARNING: This page is about a different car, the 2008 Infiniti FX45 and 2008 Infiniti FX35. However, it is still accessible from the selected car via links, so may be relevant.

Symptom: Water temperature gauge indication is malfunction.

CHECK COMBINATION METER INPUT SIGNAL

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

COMBINATION METER INPUT SIGNAL

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.

CHECK UNIFIED METER AND A/C AMP. INPUT SIGNAL
1. Select "ENGINE" on CONSULT-III.
2. Using "COOLANT 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" with that of the "COOLANT TEMP/S".
OK or NG

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

NG: Replace unified meter and A/C amp. Refer to "REMOVAL AND INSTALLATION OF UNIFIED METER AND A/C AMP. ".