Note On Intermittents

Select PCM switch test. Manipulate ISC connector, ISC wiring and PCM connector. Observe display. If throttle switch state changes momentarily, 00 will appear on display. Check for intermittent open or short in TPS wiring. Manipulate TPS connector and wiring while observing PCM data P.0.1. Watch for TPS value to jump to greater than 20 degrees at closed throttle.

Fig 1: PCM CODE E26, Schematic, Shorted TPS Switch Ckt

Courtesy of GENERAL MOTORS CORP.

Fig 2: PCM CODE E26, Flow Chart, Shorted TPS Switch Ckt

Courtesy of GENERAL MOTORS CORP.

Fig 3: PCM Code E26