Theory Of Operation

The purpose of this diagnostic procedure is to check the electrical performance of the power source which supplies the solenoid power circuit. The malfunction conditions detected by this diagnostic include out of range high and out of range low failures. The TCM measures the power source using a common input internal to the controller.

There are two solenoid power circuits (High Side Driver 1 and High Side Driver 2) within the TCM supplying battery voltage to two banks of four solenoids each. The diagnostic checks that the voltage supplied to these two solenoid power circuits is in the normal operating range.