Possible Causes
WARNING: This page is about a different car, the 2002 Nissan Pathfinder and 2002 Infiniti QX4. However, it is still accessible from the selected car via links, so may be relevant.
ECM illuminates MIL and sets DTC P0181 when a rationally incorrect voltage from FTT sensor is sent to ECM, when compared with voltage signals from engine coolant temperature sensor and intake air temperature sensor. Possible causes are:
- FTT sensor circuit open or shorted.
- Poor, loose, corroded or damaged terminal connections.
- Defective FTT sensor.