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how to test the ignition control module or ICM.
1.Remove the distributor cap, the distributor 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 chassis 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 chassis ground. There should be battery voltage.
If there is no battery voltage, check the Ignition coil and 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.
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