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Home >> Chevrolet >> 2001 >> Corvette Base, 2D Convertible, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Analog Instrument Panels >> Diagnostic Tests >> DTC B0521: Tachometer Signal Circuit Malfunction >> Diagnostic Procedures

Diagnostic Procedures

  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  under SELF-DIAGNOSTIC SYSTEM. After performing IPC diagnostic system check, go to next step.
  2. Start engine and allow to idle. Monitor tachometer on IPC. If tachometer indicates correct engine speed in RPM, go to DIAGNOSTIC AIDS  . If tachometer does not indicate correct engine speed in RPM, go to next step.
  3. 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 , Figure and Figure . White wire passes through underhood fuse block at connector C1 terminal D4 and connector C2 terminal A3. See Figure and Figure . Repair as necessary. After repairs, go to step  6 . If circuit is okay, go to next step.
  4. Check for poor connections at IPC connector. Repair as necessary. After repairs, go to step  6 . If connections are okay, go to next step.
  5. Replace IPC. See INSTRUMENT PANEL CLUSTER  under REMOVAL & INSTALLATION. After repairs, go to next step.
  6. Using scan tool, clear DTCs. Operate vehicle within conditions for setting this DTC in FREEZE FRAME and/or FAILURE RECORDS. Recheck for DTC. If DTC does not reset, system is okay at this time. If DTC resets, go to step  2 .
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