Diagnostic Circuit

Locate Data Link Connector (DLC) No. 1 in left side of engine compartment, near shock tower. Measure voltage between DLC No. 1 terminals Tc and 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 TESTS, perform next test under appropriate symptom.
Check wiring harness and connectors between cruise control ECU and DLC No. 1, and between DLC No. 1 and ground. Repair as necessary and retest system. If harness and connectors are okay, replace cruise control ECU and retest system.

Fig 1: Identifying DLC No. 1 Terminals