P1240-P1242

SENSOR POWER SUPPLY UNIT

Monitoring Procedure
The sensor power supply output is continuously monitored for high and low value. If a sustained high or low ECM input is seen, the relevant failure judgement is made. The P code is stored if a failure judgement is made on two successive trips.

If the diagnostics for Manifold Absolute Pressure (MAP) sensor A, B and the throttle position sensor are all indicating failure judgements, the sensor power supply failure judgement is made. The P code is stored if the failure judgement is made on two successive trips.