Test S: Check Transmission Indicator Is Inoperative

CAUTION: Use correct test probe adapters when making measurements. Failure to use correct probe adapter may cause damage to connector.

NOTE: Perform all voltage and resistance tests using an Digital Volt-Ohm Meter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter to isolate wiring harness shorts or opens.

Turn ignition switch to LOCK position. Disconnect Powertrain Control Module (PCM) 104-pin harness connector C175. See Figure. PCM harness connector C175 is located at right rear of engine compartment. See Figure. Connect fused jumper wire between ground and PCM harness connector C175 terminal No. 79 (White/Light Green wire). If check transmission indicator light does not illuminate, go to next step. If check transmission indicator light illuminates, repair PCM concern. See appropriate SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article in ENGINE PERFORMANCE. After repair, test system for normal operation.
Turn ignition switch to LOCK position. Disconnect instrument cluster 16-pin harness connector C220b, located behind instrument cluster. SeeFigure. It may be necessary to remove instrument cluster to access connectors. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. Measure resistance between PCM harness connector C175terminal No. 79 and instrument cluster harness connector C220b terminal No. 14 (White/Light Green wire). See Figure and Figure . See WIRING DIAGRAMS . If resistance is less than 5 ohms, replace instrument cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. If resistance is more than 5 ohms, repair open circuit in White/Light Green wire between Instrument cluster and PCM. After repair, test system for normal operation.