Notes On Intermittents

Check for binding throttle shaft and throttle blades, weak or distorted throttle spring, cruise control or throttle valve cable binding, or properly installed TPS. Intermittent Code EO27 can be induced by resting foot on accelerator with key on/key off for 10 seconds, during key on cycle.

Fig 1: ECM Code E027, Open Throttle Switch Circuit Schematic

Fig 2: Flow Chart, Code E027, Open Throttle Switch Circuit