Ignition Control Module (ICM) Input Test

2. Connect a tachometer to the test tachometer connector.

Idle speed: 770 ± 50 rpm with gear lever in neutral position and electrical systems turned off.

3. Adjust the idle speed if necessary.

Ignition Control Module (ICM) Input Test

Note:

• Perform an input test for the ignition control module (ICM) after finishing the fundamental tests for the ignition system and the fuel and emissions system.
• The tachometer should operate normally.

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

1. A ICM
2. B BLU wire
3. C WHT/BLU wire
4. D BLK/YEL wire
5. E YEL/GRN wire

2. Disconnect the BLK/YEL, WHT/BLU, YEL/GRN, and BLU wires from the ignition control module (ICM).
3. Turn the ignition switch ON. Check for voltage between the BLK/YEL wire and body earth. There should be battery voltage.
   • If there is no battery voltage, check for an open in the BLK/YEL wire between the ignition coil and the ICM.
   • If there is battery voltage, go to step 4.
4. Check for voltage between the WHT/BLU wire and body earth. There should be battery voltage.
   • If there is no battery voltage, check for:
     • faulty ignition coil.
     • an open in the 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.