Note On Intermittents

Check for throttle shaft and throttle blades binding, weak or distorted throttle spring, cruise or TV cable binding, and/or improperly installed TPS.

Intermittent Code E27 can be induced by resting foot on accelerator during key on/key off for 10 seconds cycle. Check for intermittent open on circuit No. 427 between ECM and ISC.

Fig 1: Code E27 Schematic - Open Throttle Switch Circuit

Fig 2: Code E27 Flow Chart - Open Throttle Switch Circuit