P1245, P1246

CRANK SIGNAL INPUT

Monitoring Procedure
If the engine has been started without a crank signal being input to the ECM, then a signal low failure judgement is made. The actual crank input is a grounding of the crank input pin which is normally high. The diagnostic trouble code (DTC) will be stored when a failure is detected on two successive ignition cycles.

The crank signal high judgement is made as follows. If the car has been accelerated to speed and then stopped several times in succession, with a crank signal to the ECM being continuously present, the signal high failure judgement is made. The DTC is stored if the failure judgement is made on two successive ignition cycles.