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DTC B0521: Tachometer Signal Circuit Malfunction: Testing

  1. If IPC diagnostic system check was performed, go to next step. If IPC diagnostic system check was not performed, go to procedures in IPC DIAGNOSTIC SYSTEM CHECK  .
  2. Using scan tool, check if DTC P0654 is stored in PCM memory. If DTC P0654 exists, go to TESTS W/CODES article in ENGINE PERFORMANCE section. If DTC P0654 does not exist, go to next step.
  3. Test drive vehicle and check for proper tachometer operation. If tachometer operates properly, go to next step. If tachometer does not operate properly, locate and repair problem in tachometer system.
  4. Check for intermittent malfunction in tachometer circuit. See DIAGNOSTIC AIDS. If no problem is found, go to next step. If problem is found, repair as necessary. Go to step 7).
  5. Turn ignition off. Reinstall all components and connectors. Turn ignition on. Clear DTCs. Wait 5 seconds and check for DTCs. If DTC B0521 is current, go to next step. If DTC B0521 is not current, system is operating properly.
  6. Replace IPC. See INSTRUMENT PANEL CLUSTER  under REMOVAL & INSTALLATION. Go to next step.
  7. Turn ignition off. Reinstall all components and reconnect all connectors. Turn ignition on. Clear DTCs. Perform procedures in IPC DIAGNOSTIC SYSTEM CHECK  .
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