Note On Intermittents

Display PCM parameter ED01, manipulate TPS wiring and connectors and see if TPS jumps or skips. Enter PCM input EI72, observe throttle switch status light and check for binding throttle linkage or weak throttle return spring. Verify minimum air rate RPM, ISC and TPS are set to specifications.

Fig 1: PCM Code E030, Schematic, ISC RPM Out of Range

Courtesy of GENERAL MOTORS CORP.

Fig 2: PCM Code E030, Flow Chart, ISC RPM Out of Range

Courtesy of GENERAL MOTORS CORP.

Fig 3: PCM Code E030