An equipment EC5 engine, AT8 automatic transmission 2013 Dongfeng Citroen new homes love cars. Customer response: When the car driving on the way occasionally turn ESP fault lights lit, the steering wheel back to the positive and then automatically turns off, so he went to the 4S shop maintenance requirements.
Initial diagnosis:
After receiving the fault car, the first of the brake system for routine inspection, check the brake fluid reservoir level is normal and no smell, check the connecting pipe, no leak is found, indicating that the system is not the fault of mechanical brake lines .
After using special diagnostic Lexia3 V48 DIAGBOX (shared with Dongfeng Peugeot Citroen after upgrade) to detect the ESP ECU, showed no persistent fault, no fault codes. Therefore, we can determine the brake system electronic control part is not faulty. Start the vehicle inspection test, when turning Symptom reproduce. Therefore suspect vehicle electronic control circuit is faulty.
Failure Analysis:
In the ESP system, due to the mechanical parts and brake fluid after careful examination without fault, and ESP fault lights lit occasionally also real, then the fault must exist among the electronic control system. Therefore, the use of special diagnostic Lexia3 DIAGBOX dynamic testing and found that the steering wheel angle sensor information (electric power steering torque sensor) does not change, there is no place to play the steering wheel change, therefore, suspect a problem which exists in the electronic power steering system. To understand this problem, you must understand the structure and principles of electronic power steering system.
Troubleshooting:
According to the electronic steering torque sensor signal dynamic measurement and the structure and principles of the electronic power steering system (DAE) analysis determined SKP-900 Key Programmer that the machine was part of no fault, that is targeted to check the electronic power steering system, DAE electrical control circuit to check the results for 3-way black connector pins in a bad, after repair the fault disappears. It should be reminded that: the steering wheel does not need to be initialized after the overhaul DAE, within tens of meters after the start of the vehicle's ECU DAE learning program has been started.
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