Pcm Code E027, 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.

NOTE: Test numbers refer to numbers on diagnostic chart.

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