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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, replace A/C and combination meter integrated ECU. See Figure. If tachometer needle does not move as commanded by tester, go to next step.
  2. Check igniter signal circuit. See IGNITER SIGNAL CIRCUIT . Repair as necessary. If igniter signal circuit is okay, go to next step.
  3. Check tachometer. See TACHOMETER  under COMPONENT TESTS. Repair as necessary. If tachometer is okay, replace combination meter circuit plate. See Figure.
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