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DTC B0521: Tachometer Signal Circuit Malfunction: Testing

WARNING: This page is about a different car, the 2000 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
  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 (IPC) DIAGNOSTIC SYSTEM CHECK  .
  2. Using scan tool, check if DTC P0654 is stored in PCM memory. If DTC P0654 does not exist, go to next step. If DTC P0654 exists, perform appropriate powertrain diagnostic system check. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  3. Test drive vehicle and check for proper tachometer operation. If tachometer operates properly, go to next step. If tachometer does not operate properly, go to TACHOMETER INOPERATIVE  under SYMPTOM TESTS.
  4. Check for open, short to ground or short to voltage in White wire between PCM connector C2 terminal No. 10 and IPC connector terminal A17. See Figure . If circuit is okay, go to next step. If faulty circuit is found, repair as necessary and go to step  7 .
  5. Check for poor connections at IPC connector. If connections are okay, go to next step. If faulty connections are found, repair as necessary and go to step  7 .
  6. Replace IPC. See INSTRUMENT PANEL CLUSTER (IPC)  under REMOVAL & INSTALLATION. Go to next step.
  7. 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 step  6 . If DTC B0521 is not current, system is operating properly.
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