Cruise Control - Inoperative/Malfunctioning

IMPORTANT: To avoid misdiagnosis:
^ Inspect for proper operation of the brake lamps.
^ Inspect for proper operation of the transmission range switch.
^ 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 PCM. Refer to Diagnostic System Check - Computers and Controls Systems in Computers and Controls Systems. Initial Inspection and Diagnostic Overview
^ 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. Refer to Powertrain Control Module (PCM) Description in Computers and Controls Systems for additional information.

Test

Steps 1-11:

Steps 12-25:

Steps 26-36:

Steps 37-47: