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Test E: Tachometer Inaccurate/Inoperative

  1. If instrument panel cluster diagnostic system check has been performed, go to next step. If instrument panel cluster diagnostic system check has not been performed, go to INSTRUMENT PANEL CLUSTER DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition switch to LOCK position. Connect scan tool to Data Link Connector (DLC). DLC is located at lower left side of instrument panel, near steering column. Start engine. Using scan tool, observe ENGINE SPEED parameter in ENGINE DATA 1 data display. If ENGINE SPEED parameter does not match tachometer display, go to next step. If ENGINE SPEED parameter matches tachometer display, check tachometer circuit for intermittent condition by performing tests while wiggling related wiring and connectors. This can often cause malfunction to appear.
  3. Replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. After repairs, go to next step.
  4. Check system for proper operation. If system operates properly, test is complete. If system does not operate properly, go to step  2.
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