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Q: for the Volkswagen 01M, 01N 4 forward block electronic controlled automatic transmission failure code 01192 is one of the most common fault codes of this series transmission. Fault code 01192 is actually the standard fault code P0741, which explains the mechanical torque or hydraulic failure of the torque converter locking clutch. When the automatic transmission control system is tested by the fault diagnosis instrument, how should the transmission be servicing if the device displays the fault code 01192? Answer: for the Volkswagen 01M, 01N 4 forward block electronic controlled automatic transmission failure code 01192 can be described as one of the most common fault codes of this series transmission. Fault code 01192 is actually the standard fault code P0741, which explains the mechanical torque or hydraulic failure of the torque converter locking clutch. If it is maintained according to its meaning, it is likely to deviate from the maintenance direction. The reason is that in most cases it is not the slipping of the locking clutch of the torque converter, but the skid of the 3/4 gear clutch of the transmission, K3. Therefore, in addition to the need to understand the meaning of the fault code, and combined with the actual failure phenomenon to exclude. For Volkswagen 01 M and 01N transmission, the automatic transmission control system will set the fault code when the 3/4 gear clutch K3 skidded. Generally speaking, the real symptom of failure is that there are signs of slipping in the 2 gears and 3 gears in the accelerated pedal test, while the 3 block will be severely skidded for 4 gears. Because the series transmission does not set the sensor for monitoring the turbine speed of the torque converter, the automatic transmission control unit can not accurately calculate the slip of the torque converter lock clutch through the engine speed signal. The locking slip of the series torque converter is calculated based on the engine speed signal and the output signal of the transmission through fuzzy calculation. However, the signal of the sensor is not involved in the calculation of the slip of the clutch of the torque converter, mainly controlling the shifting quality. The control unit drives the shift quality to control the action of the solenoid valve N92 through the signal, and the transmission control unit also sends out the torque reduction signal to the engine control unit in time, and the purpose is to ensure the shift quality. After understanding the function of the sensor G38, it is not difficult to understand why the control unit will set fault code 01192 after the 3/4 stop clutch K3 has slipped. When the transmission completes the 2 shift for 3 gears, it meets the working conditions of the torque converter locking clutch. Under normal circumstances, if the K3 clutch does not skid and the torque converter is working well, then the speed of the engine speed sensor G38 and the sensor G68 monitoring to the speed should be equal (3 gear is the direct gear). When the K3 clutch slips, the speed signals of sensors G38 and G68 will be different, which will cause the engine speed and the G68 speed of the sensor not equal. In principle, the hydraulic torque converter lock clutch in the 3 gear, the engine speed and the sensor G68 speed signal should not have too large deviation, so the control unit mistaken that the hydraulic torque converter lock clutch is slippery, in fact, the K3 clutch skidding. At this time, people may not understand where the control system does not record 00652 (transmission ratio detection error) fault code when the K3 clutch is skidding, which is also a design problem of the control system software. Only when the transmission is seriously skidding, the control unit will save the fault code.