P068

DTC P068:

Cruise Control Circuit:

DESCRIPTION
This diagnostic test checks for a cruise control servo feedback reading significantly higher or lower than the commanded value for a period of time. If such a condition occurs, Code P068 is set and cruise control is disabled.

TEST CONDITIONS
Cruise control engaged.

FAILURE CONDITIONS
1. Throttle angle greater than 20 degrees.
2. The servo position sensor indicating a stroke at least 7% greater than the commanded value for 2 seconds.

ACTION TAKEN
Powertrain Control Module (PCM) disables cruise control for the entire ignition cycle.

NOTES ON FAULT TREE
1. Checking if PS07 is able to fully retract cruise control servo.

2. Checking if PS07 is able to fully relax cruise control servo.

3. Checking if binding or a short to voltage on CKT 403 is keeping the cruise control servo from fully relaxing.