Diagnostic Tests: Notes

NOTE: Before clearing DTCs, perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM. Record FREEZE FRAME and FAILURE RECORDS for reference during testing. Data will be erased when DTCs are cleared.

NOTE: If PCM is replaced, NEW PCM must be programmed using special manufacturer's equipment. See POWERTRAIN CONTROL MODULE under PROGRAMMING.

NOTE: For component locations, see appropriate SYSTEM & COMPONENT TESTING article.

Fig 1: Identifying PCM Harness Connector Terminals - "C" Series

Courtesy of GENERAL MOTORS CORP.

Fig 2: Identifying PCM Harness Connector Terminals - "G" Series

Courtesy of GENERAL MOTORS CORP.