Note On Intermittents

Manipulate ISC wiring while observing PCM input EI72 and while observing ISC operation during PCM output EO07. Manipulate TPS wiring and connector while observing PCM parameter ED01 jumps, skips, and/or intermittent behavior.

Check that TPS is secured to throttle body (both screws tight). Cycle TPS through its full travel while observing parameter ED01 erratic behavior. Check proper TPS part number installed on vehicle. Unplug and plug the TPS, ISC and PCM connectors and ensure that they are latched properly.

Fig 1: PCM Code EO55, Schematic, TPS Out Of Adjustment

Fig 2: Flow Chart, PCM Code EO55, TPS Out Of Adjustment (1 of 2)

Fig 3: Flow Chart, PCM Code EO55, TPS Out Of Adjustment (2 of 2)