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Mercedes-Benz car gear shifting impact
A car with a mileage of about Mercedes-Benz sedan. The car's automatic transmission had severe shock when shifting gears.
Fault Diagnosis Our maintenance staff first confirmed the fault symptoms and then conducted a test run. They found that the vehicle had intermittent shifting shock. When the fault occurred, the shock was very obvious when the reverse gear was engaged, indicating that the fault was related to the oil pressure control. related. The automatic transmission control module was self-diagnosed and no Microsoft Yahei fault code was found. The engine control module was self-diagnosed and a fault message was found, which stated that the communication between the engine control module and the automatic transmission control module was interrupted.
Looking at the circuit diagram of the automatic transmission control module, we learned that its power supply is provided by the front control module. Open the upper cover of the front control module and find the power supply relay. Unplug the power supply relay and measure the resistance between each terminal. It is normal. After disassembling the power supply relay shell and inspecting it, it was found that the lead contacts of its electromagnetic coil were raised, which would lead to poor circuit contact. Replace the relay, clear the fault code, and test drive. If the fault symptoms disappear, the maintenance work is completed.
Fault summary For the bus, communication faults are usually caused by power interruption of the control module. Pay attention to check the connection of the power cord and grounding wire of the control module. If there are any doubtful parts, you can confirm whether they are normal by replacing them.
Shanghai Xinchehui Industrial Co., Ltd. provides high-end car repair, maintenance, and modification services
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