Pcm Code E026, Shorted Throttle Switch Circuit: Action

PCM turns on SERVICE ENGINE SOON light and assumes throttle switch is closed if brakes are applied or if TPS position is less than or equal to 18 degrees. PCM also assumes open throttle when brakes are off or TPS position is more than 18 degrees.

1. PCM Code E026 can be caused by a sticking or binding TPS.
2. Check for opens and shorts in harness. Check for switch out of adjustment. If harness and switch are okay, replace ISC motor.