Pcm Code E026, Shorted Throttle Switch Circuit: Description

Throttle switch is part of ISC motor assembly. PCM provides a 5-volt reference signal on circuit No. 427. When throttle lever contacts ISC plunger, throttle switch closes. When throttle switch is closed, input voltage is low. PCM Code E026 sets when PCM sees a TPS signal greater than 20 degrees (accelerator applied) but throttle switch remains closed.