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Test K: Tachometer Inaccurate Or Inoperative

  1. If IPC diagnostic system check was performed, go to next step. If IPC diagnostic system check was not performed, go to INSTRUMENT PANEL CLUSTER DIAGNOSTIC SYSTEM CHECK  . After performing IPC diagnostic system check, go to next step.
  2. Set parking brake and connect scan tool. Start engine and allow to idle. Using scan tool, select PCM Engine Data 1 data list and monitor ENGINE SPEED. If scan tool matches tachometer display, problem may be intermittent. To diagnose intermittent, go to TESTING FOR INTERMITTENT AND POOR CONNECTIONS . If scan tool does not match tachometer display, go to next step.
  3. Replace IPC. See INSTRUMENT PANEL CLUSTER  . After repairs, go to next step.
  4. Recheck system operation to verify the repair. If system operates properly, repair is complete. If system does not operate properly, go to step  2 .
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