Probable Cause
WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
Malfunction is detected when ECM detects an excessively low or high sensor power supply voltage. Possible causes are:
- TP sensor No. 1 and 2 circuit shorted.
- Accelerator Pedal Position (APP) sensor circuit shorted.
- Mass Airflow (MAF) sensor circuit shorted.
- EVAP Control System Pressure Sensor (EVAP-CSPS) circuit shorted.
- Power Steering Pressure (PSP) sensor circuit shorted.
- Refrigerant pressure sensor circuit shorted.
- Defective electric throttle control actuator.
- Defective APP sensor.
- Defective MAF sensor.
- Defective EVAP-CSPS.
- Defective PSP sensor.
- Defective refrigerant pressure sensor.
- Defective ECM pin terminals.
When malfunction is detected, ECM enters fail-safe mode and MIL illuminates. ECM stops electric throttle control actuator control and throttle valve is maintained at a fixed opening (about 5 degrees) by the return spring.