Pcm Code EO27, Open Throttle Switch Circuit: Action:

PCM turns on SERVICE ENGINE SOON light. EGR is disabled. PCM substitutes a throttle switch value when TPS is 18 degrees or less and brake pedal is applied. When TPS value is greater than 18 degrees or if brake is not applied, PCM substitutes a throttle switch open value.

1. ISC 4-way connector is located at a jumper connector near the alternator and cruise control servo.
2. The ISC jumper is a separate harness that connects the ISC to the PCM harness.