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Engine Coolant Temperature Gauge Circuit

NOTE: If Lexus hand-held tester is not available, begin testing with step 2).
  1. Connect Lexus hand-held tester to Data Link Connector No. 3 (DLC3). With tester in ACTIVE TEST mode, operate engine coolant temperature gauge. If engine coolant temperature gauge needle moves as commanded by tester, perform next check listed in appropriate symptom diagnosis table. See TROUBLE SHOOTING . If engine coolant temperature gauge needle does not move as commanded by tester, go to next step.
  2. Check engine coolant temperature gauge. See ENGINE COOLANT TEMPERATURE GAUGE  under COMPONENT TESTS. Repair as necessary. If engine coolant temperature gauge is okay, go to next step.
  3. Check engine coolant temperature gauge sending unit. See ENGINE COOLANT TEMPERATURE GAUGE  under COMPONENT TESTS. Repair as necessary. If engine coolant temperature gauge sending unit is okay, go to next step.
  4. Check combination meter 22-pin connector at circuit plate. See Figure. See INSTRUMENT CLUSTER CIRCUIT PLATE  under COMPONENT TESTS. Repair as necessary. If voltages are to specification, replace instrument cluster.
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