Note On Intermittents

Display PCM parameter P.0.1. Manipulate TPS wiring and connectors. Watch for TPS valve to jump or skip. Enter output cycling and manipulate ISC wiring and connectors. Watch for ISC to stop cycling. Enter diagnostics and observe throttle switch status light (OFF). Check for binding throttle linkage or weak throttle return spring. If status light flashes, check for intermittent open circuit on circuit No. 427. Verify minimum air RPM, ISC and TPS are set to specification.

Fig 1: PCM Code E30, Schematic, Idle Speed Control Circuit Problem

Fig 2: PCM Code E30, Flow Chart, Idle Speed Control Circuit Problem