Ignition Control Module: Testing and Inspection

NOTE: Perform an input test for the Ignition Control Module (ICM) only after finishing the fundamental tests for the ignition system and the fuel and emissions system. also verify that the tachometer operates normally.

1. Remove the distributor cap, the distributor rotor, and the inner cover.

Ignition Control Module Testing:

2. Disconnect the BLACK/YELLOW, GREEN, YELLOW/GREEN, and BLUE wires from the ICM.
3. Turn the ignition switch ON. Check for voltage between the BLACK/YELLOW wire and chassis ground. There should be battery voltage.
^ If there is no battery voltage, check the BLACK/YELLOW 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 GREEN wire and chassis ground. There should be battery voltage.
^ If there is no battery voltage, check the:
- Ignition coil.
- GREEN wire between the ignition coil and the ICM.
^ If there is battery voltage, go to step 5.
5. Check the YELLOW/GREEN wire between the PGM-IG ECM and the ICM.
6. Check the BLUE wire between the tachometer and the ICM.
7. If all tests are normal, replace the ICM.