P068

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 Condition(s)

Cruise control engaged.

Failure Condition(s)

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

Case 2
1. Cruise control servo commanded to 46% or less of maximum stroke.
2. The servo position sensor indicating a stroke at least 19% less than the commanded value for 10 seconds.

Action Taken

Case 1
PCM disables cruise control for the entire ignition cycle.

Case 2
PCM disables cruise control while Code P068 is current.

Notes on Intermittents:

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.