Notes on Intermittents

To diagnose intermittent set/coast function, turn cruise control dash switch to "ON" position and backprobe ECM pin "B4" with a voltmeter to ground. Pin "B4" should show 12 volts with "SET/COAST" switch depressed and zero volts with "SET/COAST" switch released. Cycle switch while manipulating wiring and connectors.

Fig 1: ECM Input Code EI80, Cruise Control Set/Coast Input

Fig 2: ECM Input Code EI80, Cruise Control Set/Coast Input