Diagnostic Circuit
- Locate Data Link Connector (DLC) No. 1 on right side of engine compartment, near air filter housing. See Figure. Connect voltmeter positive lead to terminal Tc and negative lead to terminal E1. See Fig 1. Turn ignition switch to ON position. If battery voltage is not present, go to next step. If battery voltage is present, no problem is indicated at this time. Fault may be intermittent. If sent here from SYMPTOM DIAGNOSIS, perform next test listed.
- Check for open or short circuit in wiring harness between Engine Control Module (ECM) and DLC No. 1, or between DLC No. 1 and ground. If wiring harness and connectors are okay, replace ECM and retest system.
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