Introduction to Traction Control System Diagnosis
INTRODUCTION TO TRACTION CONTROL SYSTEM (TCL) DIAGNOSISTCL Diagnostic Trouble Code Detection Conditions
TCL diagnostic trouble codes (TCL DTCs) are set under different conditions, depending on the malfunction detected. Most TCL DTCs will only be set during vehicle operation. Some TCL DTCs will also be set during the TCL self-check immediately after the engine is started. When you check if an TCL DTC will be displayed again after the DTC has been erased, you should recreate the TCL DTC set conditions. Depending on the detection timing and set conditions for the specific TCL DTC, you must either drive the vehicle or turn the engine off and restart it. To set the proper conditions for that DTC again, refer to "TCL DTC SET CONDITIONS" for each TCL DTC that you are trying to reset.
TROUBLESHOOTING STRATEGY
Use these steps to plan your diagnostic strategy. If you follow them carefully, you will check most of the possible causes of a TCL problem.
1. Gather information from the customer.
2. Verify that the condition described by the customer exists.
3. Check the vehicle for any TCL DTC. (Refer to Diagnosis Function - How to Read and Erase Diagnostic Trouble Codes).
4. If you can verify the condition but no TCL DTCs are set, and the malfunction may be intermittent.
5. If you can verify the condition but there is no TCL DTCs, or the system cannot communicate with scan tool MB991958 (M.U.T.-III sub assembly), and find the fault. (Refer to Symptom Chart).
6. If there is a TCL DTC, record the number of the code, then erase the code from vehicle memory using the scan tool MB991958 (M.U.T.-III sub assembly). (Refer to Diagnosis Function - How to Read and Erase Diagnostic Trouble Codes).
7. Re-create the TCL DTC set conditions to see if the same TCL DTC will set again. (Refer to Diagnosis Function - How to Read and Erase Diagnostic Trouble Codes).
- If the same TCL DTC sets again, perform the diagnostic procedures for the set code. (Refer to Diagnostic Trouble Code Chart).