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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, replace A/C and combination meter integrated ECU. See Figure. If engine coolant temperature gauge needle does not move as commanded by tester, go to next step.
  2. Check for engine control DTCs. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If DTCs P0115 or P0116 are set, repair as necessary. If DTCs are not set, go to next step.
  3. Check engine coolant temperature gauge. See ENGINE COOLANT TEMPERATURE GAUGE  under COMPONENT TESTS. Repair as necessary. If engine coolant temperature gauge is okay, replace combination meter circuit plate. See Figure.
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