Powertrain Controls - ECM/PCM

Code 53 Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION:


Code 53 will set when the engine is running and the ECM sees a voltage of more than 17.1 volts or less than 8.0 volts on ECM terminal "C1" and "D17". During the time the fault is present, all ECM outputs will be disengaged and setting of additional codes may result.


TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.

1. Normal battery output is between 9.6 and 16.0 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.

3. Checks to see if generator is faulty under load condition.


DIAGNOSTIC AIDS:

During the time the failure is present, all ECM outputs will be disengaged. (The setting of additional codes may result).

NOTE ON INTERMITTENTS:


Charging battery with a battery charger and starting engine, may set Code 53. If code sets when an accessory is operated, check for poor connections or excessive current draw. Also, check for poor connections at starter solenoid or fusible link junction box.