Test 6A - Electronic Instrument Cluster (EIC) Repairing Temperature Gauge Problems

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION. For wiring diagrams, see WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section. Perform TEST VER - 1A after each repair.

CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.

Ensure cooling system is operating properly. If cooling system is not operating properly, repair as needed. If cooling system is operating properly, go to next step.
Using DRB-II, stop SEQUENTIAL SEGMENT test. Using DRB-II, read engine temperature sensor voltage. If voltage is less than 10 volts, go to step 6). If voltage is more than 10 volts, go to next step.
Disconnect engine temperature sensor connector. Check, clean and repair connections as needed. Using DRB-II, read engine temperature sensor voltage. If voltage is less than 10 volts, replace engine temperature sensor. If voltage is more than 10 volts, go to next step.
Gain access to body controller, located under left side of instrument panel. Disconnect body controller connectors. Using DRB-II in voltmeter mode, measure voltage of fused ignition feed circuit at Blue body controller connector terminal No. 12 (Dark Blue/White wire). If voltage is less than 10 volts, repair open Dark Blue/White wire between body controller and splice. If voltage is more than 10 volts, go to next step.
Turn ignition off and place DRB-II in ohmmeter mode. Measure resistance of engine temperature sensor sense circuit, Natural body controller connector terminal No. 23 (Violet/Yellow wire). If resistance is more than 5 ohms, replace body control module. If resistance is less than 5 ohms, repair Violet/Yellow wire for short to ground.
If voltage in step 2) is less than 10 volts, disconnect engine temperature sensor connector. Check and clean connections. Connect jumper wire between engine temperature sensor connector (Violet/Yellow wire) and ground. Using DRB-II, read engine temperature sensor voltage. If voltage is less than one volt, replace engine temperature sensor. If voltage is more than one volt, go to next step.
Disconnect jumper wire. Gain access to body controller, located under left side of instrument panel. Connect jumper wire between Natural body controller connector terminal No. 23 (Violet/Yellow wire) and ground. Using DRB-II, read engine temperature sensor voltage. If voltage is less than one volt, repair open in Violet/Yellow wire. If voltage is more than one volt, go to next step.
Disconnect jumper wire. Disconnect Blue body controller connector. Check, clean and repair connections as needed. If connections are okay, replace body control module.