The characteristic of the fault diagnosis of the electronically controlled automatic transmission is to first determine whether the fault is in the circuit part or the mechanical part. If the fault light is on, the fault can be considered in the circuit part, otherwise it is in the mechanical part.
When the vehicle is being repaired, the ignition switch should be turned off, that is, it should be turned to the “LOCK” position. The electric control system should be overhauled when the battery negative terminal is disconnected for more than 20 seconds.
When replacing the oil seal, repairing the valve body and the solenoid valve, the transmission oil should be drained as much as possible. When disassembling nuts and sensors, special tools should be used whenever possible. When installing, tighten it to the specified torque.
The accuracy of the parts of the automatic transmission is relatively high. After the disassembly, various tests cannot be carried out. Only after the full inspection and repair is completed, the test can be carried out, so the inspection must be carried out before the disassembly and repair.
When disassembling and repairing the parts of the automatic transmission, it is best to disassemble and repair only one component group at a time. After the group is assembled, check another group to avoid wrong installation. All disassembled parts should be cleaned with transmission oil or kerosene. Dry them during assembly and blow the oil passages and oil holes with compressed air. Do not use rags.
Allow at least 15 minutes of soaking in the transmission oil before replacing the new brake and clutch friction plates. All disassembled gaskets and seal rings should be replaced with new ones and should be coated with transmission oil.
When repairing and disassembling the valve body, pay attention to the disassembly and assembly method, so as to prevent the ball valve on the valve body from falling off and not knowing the installation position. The control valves and springs should be carefully disassembled and assembled. Do not touch the surface of the control valve when disassembling.
When the transmission is installed and mounted on the vehicle, make sure that the torque converter is in place. The necessary checks and adjustments to the transmission are required before driving.
