Diagnostic Troubleshooting Strategy

AUTO-CRUISE CONTROL SYSTEM 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 problem.
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.
4. If you can verify the condition but no auto-cruise control system DTCs are set, and the malfunction may be intermittent. Refer to Introduction, 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, or the system cannot communicate with scan tool MB991502, refer to Symptom Chart and find the fault.
6. If there is an auto-cruise control system DTC, record the number of the code, then erase the code from vehicle memory using the scan tool.
7. Re-create the auto-cruise control system DTC set conditions to see if the same Auto-cruise Control System DTC will set again.
- If the same Auto-cruise Control System DTC sets again, perform the diagnostic procedures for the set code. Refer to Auto-cruise Control System Diagnostic Trouble Code Chart.