Ignition Control Module: Testing and Inspection

NOTE:
^ See Fuel and Emissions when the Malfunction Indicator Lamp (MIL)blinks.
^ Perform an input test for the Ignition Control Module (ICM) after finishing the fundamental tests for the ignition system and the fuel and emissions systems.

1. Remove the distributor ignition cap, the distributor ignition rotor. and the leak cover.

Ignition Control Module (ICM) Input Test:

2. Disconnect the wires from the ICM.
3. Turn the ignition switch ON. Check for voltage between the YEL wire and body ground. There should be battery voltage.
^ If there is no battery voltage, check:
- Ignition coil
- YEL wire between the ignition coil and the ICM
^ If there is battery voltage, go to step 4.
4. Turn the ignition switch ON. Check for voltage between the GRN wire and body ground. There should be battery voltage.
^ If there is no battery voltage, check:
- Ignition coil
- GRN wire between the ignition coil and the ICM
^ If there is battery voltage, go to step 5.
5. Check the YEL/GRN wire between the ECM and the ICM.
6. If all tests are normal, replace the ICM.