Powertrain Controls - ECM/PCM

DTC 53 System Voltage Overcharge:

System Voltage Wiring Diagram:

Circuit Description:

DTC 53 will set when the ignition is "ON" and the ECM is sensing an ignition feed voltage of more than 16.5 volts for 10 seconds.

Any time a DTC 53 failure is current, all ECM outputs will become disengaged.

Test Description: Number(s) below refer to circled number(s) on the diagnostic chart.

1. Normal battery output is between 10 - 16.5 volts.

2. Checks to see if the high voltage reading is due to the generator or ECM. With engine running, check voltage at the battery. If the voltage is above 12.1 volts, the ECM is OK.

3. Checks to see if generators faulty under load condition. If the voltage is above 16.5 volts, repair generator.