Action Taken:

Disable cruise control the entire ignition cycle. PCM turns on SERVICE ENGINE SOON light.

PCM continuously compares cruise control servo position sensor to throttle position. This diagnostic test monitors a throttle position greater than 20 degrees and servo position greater than commanded by PCM 2 seconds.

NOTE: Test numbers refer to test numbers on diagnostic chart.

TPS value should decrease at a steady rate.

Fig 1: PCM Code EO68, Schematic, Cruise Control Command Problem

Fig 2: Flow Chart, PCM Code EO68, Cruise Control Command Problem