A Preliminary Information

Diagnostic Chart (Part 1 Of 4):

Diagnostic Chart (Part 2 Of 4):

Diagnostic Chart (Part 3 Of 4):

Diagnostic Chart (Part 4 Of 4):

DIAGNOSTIC AIDS

IMPORTANT: Perform the following in order to avoid misdiagnosis.

^ Inspect for proper operation of brake lamps.
^ Inspect throttle linkage for mechanical binding which could cause the system to malfunction.
^ Inspect cruise control cable adjustment, should have minimum slack.
^ Inspect for stored Diagnostic Trouble Codes (DTCs) in the PCM. Refer to Powertrain OBD System check in Computers & Control System..
^ EMI on the speed sensor signal circuit may cause erratic cruise control operation.

CONDITIONS FOR ENABLING CRUISE CONTROL
^ When vehicle speed is more than 40 km/h (25 mph)
^ When PARK, REVERSE, NEUTRAL, or 1st gear is not indicated by the Park/Neutral Position Switch.
^ When an over/undercharged battery condition does not exist.
^ With normal engine RPM.
^ Without high engine RPM (fuel cut-off). Refer to Powertrain Control Module Description in Computers & Control System for additional information.