Reading and Clearing Diagnostic Trouble Codes

Control Module Self-Test

The electronic control module has a diagnostic capability of its own
circuitry. The self-test procedure is as follows:

1. Remove the five-wire connector and the eight-wire connector from the bottom of the electronic control module.

2. Turn the ignition switch to the RUN position.

3. Activate the self-test switch located on the module and note the result:

^ A flashing indicator lamp (approximately one flash per second) indicates that the control module is functioning properly.

^ A steady indicator lamp indicates that the control module is inoperative and must be replaced.