Control Module Self Test

The Electronic Control Module (ECM) has a diagnostic capability of its internal circuitry. Self test procedure is as follows:
1. Remove the Five-Wire Connector and the Eight Wire Connector from the ECM.
2. Turn ignition switch to the RUN position.

Control Module Self Test:

3. Activate the system self-test by pressing and releasing the self-test switch. Note the results as indicated by the indicator light:

NOTE: The self test switch and indicator light are located on the ECM.

a. A FLASHING Indicator Lamp, (approximately one flash per second) indicates that the ECM is functioning properly.
b. A STEADY Indicator Light indicates that the ECM is inoperative and must be replaced.