Possible Causes
WARNING: This page is about a different car, the 2002 Nissan Maxima and 2002 Infiniti I35. However, it is still accessible from the selected car via links, so may be relevant.
Malfunction is detected when voltage sent to ECM from ECT sensor is not practical, even when some time has passed since starting engine. Or, engine coolant temperature is insufficient for closed loop fuel control. Possible causes are:
- ECT sensor circuit open or shorted.
- Defective ECT sensor.
- Defective thermostat.