Test U: Low Coolant Indicator Is Inoperative
NOTE:
Use correct test probe adapters when making measurements. Failure to use correct probe adapter may cause damage to connector.
- Turn ignition switch to LOCK position. If low coolant indicator light illuminates with ignition off, go to step 5 . If low coolant indicator light does not illuminate, go to next step.
- Turn ignition switch to LOCK position and then to RUN position. If coolant light illuminates, go to next step. If coolant light does not illuminate, go to step 4 .
- Turn ignition switch to RUN position. Wait for 30 seconds. If low coolant light is illuminated after 30 seconds, go to step 11 . If low coolant light is not illuminated after 30 seconds, system is operating correctly at this time.
- Turn ignition switch to RUN position. Connect New Generation Star (NGS) tester. In active command mode request CLNT_LAMP ON. If low coolant indicator light illuminates, go to step 13 . If low coolant indicator light does not illuminate, go to step 7 .
- Turn ignition switch to LOCK position. Disconnect GEM module harness connector C201b. See Fig 2 . If low coolant indicator light stays illuminated, go to next step. If low coolant light does not stay illuminated, go to step 13 .
- Turn ignition switch to LOCK position. Disconnect instrument cluster connector C220a. Measure voltage between ground and terminal No. 12 (Black/Pink wire) on instrument cluster harness connector C220a. See Figure . If battery voltage is present, repair short to power in Black/Pink wire and retest. If battery voltage is not present, replace instrument cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION.
- Turn ignition switch to LOCK position. Disconnect GEM connector C201b. Turn ignition switch to RUN position. Measure voltage between ground and terminal No. 9 (Black/Pink wire) at GEM harness connector C201b. If battery voltage is present, go to step 13 . If battery voltage is not present, go to next step.
- Turn ignition switch to LOCK position. Disconnect instrument cluster connector C220a. Measure resistance between terminal No. 9 (Black/Pink wire) at GEM harness connector C201b and terminal No. 12 (Black/Pink wire) at instrument cluster harness connector C220a. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Black/Pink wire and retest.
- Turn ignition switch to LOCK position. Disconnect GEM module connector C201b. If low coolant light stays illuminated, go to next step. If low coolant light does not stay illuminated, go to step 13 .
- Turn ignition switch to LOCK position. Disconnect instrument cluster connector C220a. Measure resistance between ground and terminal No. 12 (Black/Pink wire) at instrument cluster harness connector C220a. If resistance is more than 10 k/ohms, replace instrument cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION. If resistance is less than 10 k/ohms, repair short to ground in Black/Pink wire and retest.
- Turn ignition switch to LOCK position. Disconnect low coolant sensor connector C1069. If low coolant indicator light stays illuminated after 30 seconds, go to next step. If low coolant indicator light does not stay illuminated after 30 seconds, replace coolant level sensor.
- Measure resistance between ground and terminal No. 2 (Black wire) at low coolant sensor connector C1069. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in (Black wire) and retest.
- Turn ignition switch to LOCK position. Disconnect GEM module connector C201a see Fig 1 . Measure resistance between ground and terminal No. 1 (White/Light Blue wire) at GEM harness connector C201a. If resistance is more than 10 k/ohms, go to next step. If resistance is less than 10 k/ohms, repair short to ground in White/Light Blue wire and retest.
- Check for the following conditions, corrosion, pushed-out pins and see if connector is seated correctly. Correct any problems found. Operate system and verify concern is still present. If concern is still present, replace GEM module and retest. See appropriate MODULE COMMUNICATIONS NETWORK article. If system is now operating correctly, problem may have been caused by a loose or corroded connector.