Temperature Gauge Circuit Test
- Check Ground Circuit - Remove instrument cluster and leave harnesses connected. Check continuity between instrument cluster harness connector terminal No. 30 (terminal No. 28, if equipped with tachometer) and ground. See Figure or Figure . If continuity exists, go to next step. If continuity does not exist, repair open ground circuit (Black wire).
- Check Power Source
- Turn ignition on. Measure voltage between ground and instrument cluster terminal No. 34 (terminal No. 41, if equipped with tachometer). See Figure
or Figure
. If battery voltage exists, go to next step. If battery voltage does not exist, check fusible links, ignition switch, ignition relay and ignition power circuit. See WIRING DIAGRAMS
. Also see POWER DISTRIBUTION in SYSTEM WIRING DIAGRAMS
section.CAUTION: In the following step, DO NOT ground temperature gauge terminal for more than 10 seconds.
- Check Gauge Operation - Turn ignition on. Leave instrument cluster plugged in. Using a jumper wire, ground instrument cluster harness connector terminal No. 29 (terminal No. 42, if equipped with tachometer). Temperature gauge should move smoothly to hot mark. If gauge operates as specified, go to next step. If gauge does not operate as specified, replace fuel gauge.
- Check Harness - Disconnect instrument cluster harness connectors. Check continuity of Purple/White wire between instrument cluster harness connector terminal No. 29 (terminal No. 42, if equipped with tachometer) and temperature sending unit. See Figure or Figure . If continuity exists, go to next step. If continuity does not exist, repair open Purple/White wire.
- Check Temperature Sending Unit - Test temperature sending unit. See TEMPERATURE SENDING UNIT under COMPONENT TESTS. Replace sending unit if necessary.