Diagnostic Troubleshooting Strategy

AUTO-CRUISE CONTROL SYSTEM DIAGNOSIS

DIAGNOSTIC TROUBLESHOOTING STRATEGY
Use these steps to plan your diagnostic strategy. If you follow them carefully, you will check most of the possible causes of an cruise control system malfunction.
1. Gather information from the customer.
2. Verify that the condition described by the customer exists.
3. Check the vehicle for any cruise control system DTC. (Refer to Diagnostic Function-How to Read Diagnostic Trouble Codes). Reading Diagnostic Trouble Codes
4. If you can verify the condition but no cruise control system DTCs are set, the malfunction may be intermittent. (Refer to General (Body and Chassis), How to Use Troubleshooting/Inspection Service Points- How to Cope with Intermittent Malfunctions).
5. If you can verify the condition but there are no cruise control system DTCs, find the fault. (Refer to Symptom Chart). Symptom Chart
6. If there is an cruise control system DTC, record the number of the code, then erase the code. (Refer to Diagnostic Function- How to Erase Diagnostic Trouble Codes). Reading Diagnostic Trouble Codes
7. Re-create the cruise control system DTC set conditions to see if the same cruise control system DTC will set again. (Refer to Diagnostic Function- How to Read Diagnostic Trouble Codes). Reading Diagnostic Trouble Codes
- If the same cruise control system DTC sets again, perform the diagnostic procedures for the set code. (Refer to Diagnostic Trouble Code Chart). Diagnostic Trouble Code Descriptions