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Tachometer 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 tachometer. If tachometer needle moves as commanded by tester, perform next check listed in appropriate symptom diagnosis table. See TROUBLE SHOOTING . If tachometer needle does not move as commanded by tester, go to next step.
  2. Check tachometer. See TACHOMETER  under COMPONENT TESTS. Repair as necessary. If tachometer is okay, go to next step.
  3. Check combination meter ECU No. 1-to-gauges circuit plate. See INSTRUMENT CLUSTER CIRCUIT PLATE  under COMPONENT TESTS. Repair as necessary. If circuit plate is okay, replace combination meter (instrument cluster).
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