Throttle Motor Relay Driver Monitor - P1631, P1657

Throttle motor relay driver monitor - P1631, P1657

DC motor relay driver OFF failure
During ignition on the relay driver target flag is compared with the relay driver signal. If the ECM is commanding the relay ON and detecting the relay driver as OFF for more than a calibration period, a failure judgement is made.

DC motor relay driver ON failure
After ignition off the ECM sets the relay driver off. This is compared with the relay driver monitor. If the ECM is commanding the relay OFF and detecting the relay driver as ON for more than a calibration period, a failure judgement is made.