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Test F: Temperature Gauge Inaccurate

  1. Check Engine Coolant Temperature (ECT) sensor. See ENGINE COOLANT TEMPERATURE (ECT) SENSOR under COMPONENT TESTS  . Repair as necessary. If ECT sensor is okay, go to next step.
  2. Turn ignition off. Disconnect ECT wiring harness connector. Remove instrument cluster. See REMOVAL & INSTALLATION  . Disconnect instrument cluster connector C272. See Figure . Measure resistance between instrument cluster connector C272, pin No. 2 (Blue/White wire) and ECT sensor connector Blue/White wire. Resistance should be less than 5 ohms. Measure resistance between ground and instrument cluster connector C272, pin No. 2. Resistance should be more than 10,000 ohms. If resistances are as specified, replace instrument cluster. If resistances are not as specified, repair short in Blue/White wire.
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