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Test Q: Tachometer Inaccurate

  1. Turn ignition switch to LOCK position. Connect New Generation Star (NGS) or Worldwide Diagnostic System (WDS) tester to Data Link harness connector (DLC). Using NGS/WDS tester, monitor PCM PID RPM. Start vehicle. With engine running compare PID value on NGS/WDS tester to tachometer. If RPM matches, system is okay at this time. If RPM does not match, go to next step.
  2. Disconnect instrument cluster harness connectors. Remove instrument cluster. Measure resistance between terminal No. 13 at instrument cluster harness connector C808A (component side) and tachometer terminal T1 on printed circuit. See Figure . If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, replace printed circuit.
  3. Measure resistance between terminal No. 8 at instrument cluster harness connector C808A (component side) and terminal T3 at tachometer printed circuit. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, replace printed circuit.
  4. Measure resistance between terminal No. 9 at instrument cluster harness connector C808A (component side) and tachometer terminal T2 on printed circuit. If resistance is 5 ohms or less, replace tachometer or instrument cluster as necessary. If resistance is more than 5 ohms, replace printed circuit.
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