Notes On Intermittents

Check for binding throttle linkage (throttle valve, cruise control or throttle cables), TPS installed improperly, or throttle shaft binding. Check for proper throttle return spring and throttle return spring installation.

Probe ECM terminal C10 to ground with a voltmeter. Manipulate wiring and connectors at closed throttle and watch for 5 volts, indicating an open from terminal C10 to ground. Manipulate wiring and connectors at open throttle and watch for zero volts, indicating short to ground on circuit No. 427.

Fig 1: ECM Input Code EI72, Throttle Switch Circuit Schematic

Fig 2: Flow Chart, Input Code EI72, Throttle Switch Circuit