The fault of the automatic transmission of a Petrol Car should be solved like this

First, read the fault code, connect the fault diagnosis instrument, enter the Petrol Car automatic transmission control unit to query the fault code, and store a fault code. The management strategy of the J217 control unit of the Petrol Car automatic transmission of the Bora sedan is that if the sensor signal loss that may cause the Petrol Car automatic transmission control unit to be unable to recognize the shifting moment or the shift solenoid valve stores the fault code, the Chery Car automatic transmission enters the emergency state and fixes the transmission in the 3rd gear for driving.

Measure the wiring connecting each solenoid valve, remove the solenoid valve, and measure the corresponding jacks of each solenoid valve socket with the red pen of the ohmmeter according to the circuit diagram. Perform a continuity test on the solenoid valve wiring and find that the wire between the connector and N89 is broken. When shaking the wire, it is sometimes on and sometimes off.
The Petrol Car automatic transmission enters the 3rd gear emergency operation, and it is determined that the cause of the fault is the wire break between the positive pole of the solenoid valve N89 and the control unit. The 7 solenoid valves on the valve body and the box plug use printed circuits (copper foil pressed into a soft plastic sheet). Due to vibration, corrosion, aging, overcurrent, the copper foil of the printed circuit may break.
Replace the solenoid valve wiring assembly of the automatic transmission of the Chery Car, conduct a road test, clear the fault code, drive normally, and eliminate the fault.