Ignition Control Module: Testing and Inspection

IGNITION CONTROL MODULE (ICM) / Input Test
NOTE:
- Refer to Fuel and Emissions/Self-Diagnostic Procedures 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.
- The Tachometer should operate normally if the ICM is OK.

1. Remove the Distributor Ignition Cap, the Distributor Ignition Rotor, and the Leak Cover.





2. Disconnect the BLK/YEL, GRN, YEL/GRN, and BLU wires from the ICM.
3. Turn the Ignition Switch "ON". Check for voltage between the BLK/YEL (YEL) Wire and Body Ground. There should be Battery voltage.
- If there is no Battery voltage, check the BLK/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 the Ignition Coil and the GRN (BLU) 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 Engine Control Module (ECM) and the ICM.
6. Check the BLU Wire between the Tachometer and the ICM.
7. If all tests are normal, replace the ICM.