Ignition Control Module: Testing and Inspection

INPUT TEST

NOTE:
- Refer to Computers and Control Systems/System Diagnosis 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 Inner Cover.

Ignition Control Module:

2. Disconnect the BLK/YEL, WHT/BLU, YEL/GRN, and BLU wires from the ICM.
3. Turn the Ignition Switch "ON". Check for voltage between the BLK/YEL Wire and Body Ground. There should be Battery voltage.
- If there is no Battery voltage, check the BLK/YEL Wire between the Ignition Switch and the ICM.
- If there is Battery voltage, go to step 4.

4. Turn the Ignition Switch "ON". Check for voltage between the WHT/BLU Wire and Body Ground. There should be Battery voltage.
- If there is no Battery voltage, check:
Ignition Coil.
WHT/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.