Troubleshooting Hints

PERFORM BEFORE BEGINNING SYSTEM DIAGNOSIS:
The Powertrain Control Module (PCM) will "Inhibit" Cruise Control when there is a malfunction in any of the Cruise Control Inhibit Criteria. The PCM will "Inhibit" Cruise Control when:
^ The engine is "OFF"
^ An automatic transaxle is in "PARK" or "NEUTRAL"
^ A manual transaxle is out of gear (in "NEUTRAL")
^ There is high engine RPM (fuel cut-off)
^ There is high vehicle speed (fuel cut-off)
^ The PCM sets the following DTCs:
a. DTC 19 (CRANK SENSOR)
b. DTC 53 (UNDER/OVER BATTERY VOLTAGE)
c. DTC 65 (FUEL INJECTOR)
^ A four speed automatic transaxle or Smart Cluster equipped car is in "REVERSE"
^ A four speed automatic transaxle equipped car's PCM sets the following DTCs:
a. DTC 24 (VSS)
b. DTC 21 or 22 (TPS ACTIVE)
^ The Enhanced Traction System (ETS) is active (4-Spd Auto & Pontiac only).
1. Check all cruise control inhibit criteria.
2. Check for Diagnostic Trouble Codes (DTC). Refer to Computers and Control Systems.
3. Check that Cruise Control Module Linkage is connected and moving freely.
4. Check Cruise Cable Adjustment.
5. Check Brake Switch for proper adjustment/alignment.

^ Make sure that Center High Mounted Stoplamp (CHMSL) is working. If inoperative, Cruise Module will be disabled.
^ Check for a broken (or partially broken) wire inside of the insulation which could cause system failure but prove "GOOD" in a continuity/voltage check (refer to "General Troubleshooting Procedures"). Diagnostic Aids
^ Check for proper installation of aftermarket electronic equipment which may effect the integrity of other systems (refer to "General Troubleshooting Procedures").
^ Refer to System Diagnosis. Testing and Inspection