Cruise Control - Inoperative/Malfunctioning

CRUISE CONTROL INOPERATIVE/MALFUNCTIONING

DIAGNOSTIC AIDS

IMPORTANT: Perform the following in order to avoid misdiagnosis:

- Inspect for proper operation of the brake lamps.
- Inspect throttle linkage for mechanical binding which could cause the system to malfunction.
- Inspect cruise control adjustment, should have minimum slack.
- Inspect for stored diagnostic trouble codes (DTCs) in the powertrain control module (PCM).
- 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.
- 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 (PCM) Description in Computers and Control Systems-4.6L for additional information.

TEST

Steps 1-8:

Steps 9-22:

Steps 23 - 34:

Steps 35 - 43: