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Test H: Tachometer Inaccurate Or Inoperative

  1. Review description and operation prior to performing test. See DESCRIPTION & OPERATION  .
  2. If other instrument cluster gauges are inoperative, go to next step. If other instrument panel gauges are not inoperative, go to step  4 .
  3. Turn ignition switch to RUN position. Using a test light connected to ground, backprobe instrument cluster harness connector C1 terminal No. 2. See Figure . If test light illuminates, go to step  5 . If test light does not illuminate, go to step  6 .
  4. Turn ignition switch to START position and allow engine to obtain normal operating temperature. Measure tachometer frequency by backprobing instrument cluster harness connector C3 terminal No. 3 (Black wire). Tachometer frequency should be 18-25 Hz. If frequency is as specified, go to step  9 . If frequency is not as specified, repair open in Black wire between powertrain control module. After repair, go to step  11 .
  5. Replace instrument cluster printed circuit. After repair, go to step  11 .
  6. Using a test light connected to ground, backprobe junction block No. 3 harness connector C2 terminal No. 18 (Red/Blue wire). If test light illuminates, go to next step. If test light does not illuminate, go to step  8 .
  7. Repair open in Red/Blue wire between junction block No. 3 and instrument cluster. After repair, go to step  11 .
  8. Replace junction block No. 3. After repair, go to step  11 .
  9. Check instrument cluster printed circuit for damage. If instrument cluster printed circuit is damaged, go to step  5 . If instrument cluster printed circuit is not damaged, go to next step.
  10. Replace tachometer. After repair, go to next step.
  11. Operate system to verify repair. If problem does not exist, system is okay. If problem still exists, go to step  3 .
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