ECM Power Supply Circuit

Checking Engine Control Module ECM Unit Power Supply Circuit Confirmation
1. Disconnect Engine Control Module (ECM) Connectors.
2. Turn key to "ON" position.
3. Check that power voltage is present at connector terminals 108 , 111 and 23.
4. Check that continuity exists between the connector terminals 109, 112 and ground.

Inspection and Correction
1. When power voltage is not present at terminals 108, 111 and 23. Check the Main Relay, Ignition Switch, Fuses, Fusible Link Wires and related circuits and correct or replace the parts as necessary.
2. If the Digital Multimeter does not indicate continuity across the terminals 109, 112 and ground, correct or replace grounding cable.
3. Connect the ECM connectors properly.