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Engine Coolant Temperature Gauge Circuit

NOTE: If not using the hand-held tester, start the inspection from step  2.
  1. Connect the hand-held tester to the DLC3. See Figure. Turn the ignition switch ON and the hand-held tester main switch ON. Select the ACTIVE TEST mode on the hand-held tester. Check that the probe moves as the hand-held tester directs in each range. If the probe operates normally, proceed to the next circuit inspection of the symptom. See PROBLEM SYMPTOM INDEX  table. If the probe does not operate normally, go to the next step.
  2. Check the engine coolant temperature receiver gauge. See ENGINE COOLANT TEMPERATURE RECEIVER GAUGE  under COMPONENT TESTS. If the results are OK, go to the next step. If the results are not good, replace the engine coolant temperature receiver gauge assembly. See COMBINATION METER  under REMOVAL & INSTALLATION.
  3. Check the engine coolant temperature sender gauge. See ENGINE COOLANT TEMPERATURE (ECT) SENSOR under ENGINE SENSORS & SWITCHES in appropriate SYSTEM & COMPONENT TESTING article in ENGINE PERFORMANCE. If the results are OK, go to the next step. If the results are not good, replace the engine coolant temperature sender gauge. See ENGINE COOLANT TEMPERATURE (ECT) SENSOR under ENGINE SENSORS & SWITCHES in appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE.
  4. Check the circuit plate. See COMBINATION METER CIRCUIT . If the results are OK, check and replace the combination meter. See COMBINATION METER  under REMOVAL & INSTALLATION. If the results are not good, replace the circuit plate. See COMBINATION METER  under REMOVAL & INSTALLATION.
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