March 2009, equipped with DSG Magotan sedan once launched, you get the enthusiastic response of consumers, sales growth by leaps and bounds. Increase the car, queuing car and let you and a public dealer can see. DSG has become a synonym for high performance, low fuel consumption and low emissions.
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    Simple and affordable low cost maintenance
    In addition to driving high-powered vehicles, low fuel consumption, born out of the AMT transmission DSG there are the advantages of low maintenance costs. According to the manufacturer official data:
    DSG gearbox has two long-acting oil - gear oil and central hydraulic system oil, gear oil market guidance price of 119.75 yuan per liter (excluding tax), each driving 55,000 km or 4 years for the first time to check the state of oil, If necessary, after the replacement of every 60,000 km or 4 years to check once, according to the results of the inspection to decide whether to replace. The central hydraulic system oil does not need to check the oil level and replace it.
    DSG transmission recall caused by friends hot
    August 2009 Volkswagen in North America recalled Volkswagen loaded with DSG gearbox. Subsequently, FAW Volkswagen also began to recall some of the hidden trouble DSG gearbox. The recalls were overshadowed by the new technology. The major domestic media have also burst out of the DSG transmission of the question, the forum also frequent users of the DSG transmission failure of the post.
    These users reflect the DSG gearbox failure, basically with the recall of the DSG gearbox has the same failure. That is, driving in the city conditions, the transmission suddenly out of the file, resulting in engine stall.
    Fault case
    A 2009 FAW-Volkswagen MAGOTAN 2.0TSIDSG Deluxe Edition sedan. According to the owner to reflect the car at the start of the occasional refueling engine idling does not take the phenomenon of waiting for traffic lights after the start sometimes when the failure will occur, sometimes in the normal driving when the acceleration occurs, there is no law failure, The gear indicator on the meter is red and blinks.

    First use the fault diagnosis instrument VAS5052A into the gateway inspection, the control unit are no fault code storage. Combined with the car's fault phenomenon, in view of the fact that the engine response is good, you can initially determine the engine is working properly. Because the vehicle mileage is very short, if the transmission mechanical transmission part is not unusual, the cause of the engine stall can be basically attributed to the transmission clutch was cut off, or the clutch itself has a mechanical failure. The transmission electronic control system provides monitoring of the clutch cut-off data through the data stream 02-08-64 Group 1, which reads 63 times the power off of the clutch and the normal value should be 0, which clearly indicates that the clutch is protective Cut off.
    According to the control principle of the DSG transmission, the clutch circuit is usually caused by the following reasons: the circuit fault of the direct control system is recognized or triggered to protect the cut off function; the oil temperature sensor triggers the protection cut when the temperature exceeds the working limit; When the oil pressure is too high, the corresponding mechanical power transmission assembly is cut off by the mechanical mechanical pressure control valve N233 (N371) and the joint safety spool. In view of the fact that there is no clear fault code display, electronic control components or line directness of the open / short circuit causes the possibility of failure can be ruled out. For safety control solenoid valves N233 and N317, they are control valves that control half of the mechanical parts of the transmission (transmission section 1 and drive section 2) and allow safety when there is a safety fault or if the clutch operating pressure is too large It is noteworthy that the hydraulic cutoff in these two states is generally one of the transmission section 1 or the transmission section 2, and at this time, even if the partial transmission is cut off, Will cause the engine is similar to the N block in the idle stall state, Moreover, in many practical circumstances will trigger the activation of the emergency function, and this case is not consistent with the fault phenomenon.
    At this point, the failure to start point naturally concentrated in the oil temperature sensor signal. For the DSG transmission, there are three oil temperature sensors: the transmission oil temperature sensor G93 and the control unit temperature sensor G510 built in the transmission control unit, when the induction of oil temperature exceeds 145 ℃, the electronic control system will stop the clutch The clutch temperature sensor G509 (integrated with the clutch speed sensor) is located in the clutch housing, the signal will also trigger the transmission of the transmission function to cut off the clutch of the oil supply, but the information on the oil temperature cut off the protection of the The limit value is not given a clear definition. So what is the sensor which produces a signal to cut off the clutch circuit? Because the stall failure is occasionally present, in order to accurately monitor the state of the oil temperature of the signal, the use of fault diagnosis VAG5053 on the oil temperature change data dynamic tracking. In the dynamic data, the temperature values ​​(series 2) of the 2801 connected measurement points (3.57 samples in about 1s), the transmission oil temperature sensor G93 (series 1) and the control unit temperature sensor G510 And the dynamic change curve of the temperature value (series 3) collected by the clutch temperature sensor G509 is obviously higher than that of the other two oil temperature. At some dynamic collection points, the oil temperature collected by G509 is higher than that of the other two oil Temperature actually higher than about 40 ℃. At this point, the working conditions of the clutch safety control solenoid valves N233 and N317 are further monitored, and the data shows that the electronic control duty cycle control meets the operational characteristics of the shift, and the actual working oil pressure of the clutch K1 and K2 is compared with the clutch hydraulic pressure The control valves N215 and N216 can also be normal according to the proportional change curve on the K1 and K2 were timely control of the characteristics. The above tests show that the operating conditions of the clutch K1 and K2-related solenoid valves are not abnormal, although no stall failure has occurred during the test (after reading 02-08-64 Group 1 is still shown as clutch cut off power transmission The number of times is 63 times, no increase), but enough to explain the clutch temperature sensor G509 sensor characteristics of the abnormal changes in the fact that maintenance personnel analysis is G509 temperature sensor electrical components caused by unstable operating characteristics. Because the failure characteristics of G509 are signal misalignment, the induction temperature does not exceed the limit value, the engine control unit will not store the fault memory of the G509 signal inaccurate, but once the protection cut limit is exceeded, the system will immediately generate the interrupt clutch solenoid valve N215 and N216 work instructions, thus cutting off the transmission and engine power transmission, this time will produce stall phenomenon and instrument gear display abnormal flashing phenomenon, in order to facilitate the monitoring needs, the system cut the number of the corresponding count and storage.
 Clutch temperature sensor G509 installed in the transmission body on the base of the shell, the replacement need to remove the hydraulic control valve body. When removing the hydraulic control valve body assembly unit, be sure to avoid the breakage of the output shaft 2 speed sensor bracket. Be sure to remove the pump rear cover according to the maintenance manual. Under the premise of ensuring that the sensor bracket is not interfered with Carefully remove the hydraulic control valve assembly.
    Troubleshooting:
    Replace the clutch temperature sensor G509, repeated road test, monitoring the three oil temperature sensor values ​​tend to be consistent, so the fault completely ruled out.
    Expedient
    The recall of the equipment within the scope of equipment DSG gearbox, FAW - Volkswagen Automobile Co., Ltd., Volkswagen Imported Automobile Sales Co., Ltd. is committed to free maintenance to eliminate security risks. Responding to the gearbox failure, the public has taken the replacement of temperature control sensors and slide valve box method to solve the gearbox failure. But the public still can not promise to replace the owner of the slide valve box to ensure that solve the problem.
    From the DSG gearbox working principle analysis, in the city conditions, DSG gearbox clutch will be long-term semi-clutch state. The clutch is prone to overheating and the temperature sensor will sense the temperature too high to stop the transmission. Therefore, improving the transmission heat dissipation system may be the best way to solve the self-locking fault of the DSG transmission failure. This look, the current mass change gearbox sliding box, but the temporary solution to the problem of equity.