Battery Electrical Drain/Parasitic Load Test. Chevrolet PJJ 2000

For 1990-2009 cars

Before performing the PCM Draw Test ensure that the following conditions are met:

• | The ignition key is out of the ignition.

• | All the doors are closed.

• | The head lights and park lights are Off.

• | The courtesy lights are Off.

• | The battery is fully charged.

Perform the following procedure before starting the PCM Draw Test:

1. Reconnect the negative battery cable.
2. Remove the voltage from the PCM memory. Refer to Electrical Diagnosis in Electrical Body and Chassis.
3. Connect a milliammeter between the terminals.
4. Read the measurement.

Checks | Action
--- | ---

DEFINITION: PCM current draw should be less than 10 milliamps with no circuits active. The measurement determines the value of the PCM current with all systems off.

• | A measurement above 10 milliamps indicates a possible problem with the PCM.

• | A measurement below 10 milliamps indicates that the PCM is OK.

• | A measurement over 10 milliamps indicates that the problem is not the PCM.

• | A measurement of approximately 0 amps indicates a faulty PCM.

The measurement is over 10 milliamps. | Disconnect the PCM and recheck the current draw as directed.
The measurement is below 10 milliamps | Perform the battery electrical drain check again in order to recheck the current drain.

The measurement is over 10 milliamps

1. Inspect the ORN wires for a short to ground.
2. Inspect the components connected to the ORN wires. Refer to Testing for Short to Ground in Wiring Systems.

The measurement is approximately 0 amps. | Replace the PCM. Refer toPCM Replacement/Programming in Engine Controls.