ECM Power Supplies

ECM Power Supplies

Description

The ECM supplies are monitored for two conditions.

The first is loss of power to Pin B54 when the ignition is on. If the supply is not present for more than a predefined time than a failure will be registered.

The second condition is a system control relay supplying power to the ECM when it should be off. In this case, only a single occurrence of the fault will illuminate the MIL.