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Coolant Temperature Reads Inaccurately

  1. Perform TEMPERATURE GAUGE TEST  under COMPONENT TESTS. If temperature gauge perform properly, replace temperature sensor and retest system. If temperature gauge does not perform properly, go to next step.
  2. Turn ignition off. Disconnect temperature sensor harness connector. Remove instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Disconnect instrument cluster connector C215. See Figure . Measure resistance of Red/White wire between instrument cluster connector C215 terminal No. 3 and temperature sensor harness connector. Resistance should be less than 5 ohms. Measure resistance between ground and instrument cluster connector C215 terminal No. 3 (Red/White wire). Resistance should be more than 10 k/ohms. If resistance is as specified, go to next step. If resistance is not as specified, repair open or short in Red/White wire and retest system.
  3. Disconnect instrument cluster connector C216. Turn ignition on. Measure voltage between ground and optional instrument cluster (with tachometer) connector C216 terminal No. 1 (Red/Yellow wire) or standard instrument cluster (without tachometer) connector C215 terminal No. 8 (Red/Yellow wire). See Figure or Figure . If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, repair open in Red/Yellow wire between instrument cluster connector and fuse No. 11 in interior fuse panel and retest system.
  4. Turn ignition off. Measure resistance between ground and instrument cluster connector C215 terminal No. 2 (Black/White wire). If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Black/White wire between instrument cluster connector and ground and retest system.
  5. Measure resistance between instrument cluster temperature gauge clips "B" and "S". Resistance should be 214-256 ohms. Measure resistance between instrument cluster temperature gauge clips "G" and "S". Resistance should be 90-110 ohms. If resistances are as specified, replace instrument cluster printed circuit and retest system. See PRINTED CIRCUIT  under REMOVAL & INSTALLATION. If resistances are not as specified, replace temperature gauge and retest system. See GAUGES under REMOVAL & INSTALLATION.
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