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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Analog Instrument Panels) >> Diagnostic Tests >> DTC B0521: Tachometer Signal Circuit Malfunction >> Diagnostic Aids

Diagnostic Aids

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. Conditions that may cause an intermittent are 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 appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  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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