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Test Q: Tachometer Inaccurate

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