Diagnostic Strategies

A/T DIAGNOSTIC TROUBLESHOOTING STRATEGY
Use these steps to plan your diagnostic strategy. If you follow them carefully, you will find most A/T malfunctions.
1. Gather as much information as possible about the complaint from the customer.
2. Verify that the condition described by the customer exists.
3. Check the vehicle for any A/T Diagnostic Trouble Codes (DTCs).
4. If you cannot verify the condition and there are no DTCs, the malfunction is intermittent.
5. If you can verify the condition but there are no DTCs, or the system cannot communicate with the scan tool MB991958, refer to Symptom Chart. Symptom Chart
6. If there is a DTC, record the number of the code, then erase the code from memory using the scan tool MB991958.
7. Reconfirm the symptom with a the Road Test.
8. If a DTC is set again, go to the Inspection Chart for Diagnostic Trouble Codes. Diagnostic Trouble Code Descriptions
9. If a DTC is not set again, the malfunction is intermittent.
10 .After repairs are completed, conduct a Road Test duplicating the complaint conditions to confirm the malfunction has been eliminated.