Diagnostic Aids

PCM is unable to process correct engine speed data sent from PCM or intermittent or erratic RPM signal. If problem is intermittent, go to INTERMITTENTS in BODY CONTROL MODULES - CORVETTE article.

Fig 1: Locating Powertrain Control Module

Courtesy of GENERAL MOTORS CORP.

Fig 2: Identifying Powertrain Control Module Connectors & Terminals

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Fig 3: Identifying Underhood Fuse Block Connectors

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Fig 4: Identifying Underhood Fuse Block Connector Terminals

Courtesy of GENERAL MOTORS CORP.