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Home >> Chevrolet >> 1998 >> Corvette 2D Convertible, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Testing - Diagnostic >> DTC B0521: Tachometer Signal Circuit Malfunction >> Diagnostic Aids

Diagnostic Aids

  1. The following conditions may cause an intermittent: PCM is unable to process correct RPM data or erratic RPM signal sent from PCM.
  2. Test drive vehicle and check for proper tachometer operation. If IPC cannot display proper engine RPM information, use scan tool to display PCM engine RPM data. If PCM is not sending proper engine RPM data to IPC, PCM and engine RPM circuits must be diagnosed first before diagnosing DTC B0521. See TESTS W/CODES article in ENGINE PERFORMANCE section.
  3. Before diagnosing DTC B0521, always check for proper tachometer operation by using scan tool to display PCM engine RPM data and check for VSS DTCs.
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