Diagnostic Troubleshooting Strategy

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 auto-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 auto-cruise control system DTC. (Refer to Engine and Emission control, Diagnostic Function - How to Read Diagnostic Trouble Codes). Reading Diagnostic Trouble Codes
4. If you can verify the condition but no auto-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 auto-cruise control system DTCs, find the fault. (Refer to Engine and Emission control, Symptom Chart). Symptom Chart
6. If there is an auto-cruise control system DTC, record the number of the code, then erase the code. (Refer to Engine and Emission control, Diagnostic Function - How to Erase Diagnostic Trouble Codes). Reading Diagnostic Trouble Codes
7. Re-create the auto-cruise control system DTC set conditions to see if the same auto-cruise control system DTC will set again. (Refer to Engine and Emission control, Diagnostic Function - How to Read Diagnostic Trouble Codes). Reading Diagnostic Trouble Codes
- If the same auto-cruise control system DTC sets again, perform the diagnostic procedures for the set code. (Refer to Engine and Emission control, Diagnostic Trouble Code Chart). Diagnostic Trouble Code Descriptions