Control Module Behavior When There Is A Malfunction

The control module works with developed software. This software has the ability to execute electrical functions, monitor and control within milliseconds. Everything modern transmission electronics have going for them is located in this control module. This should also be considered during troubleshooting.

However, no electronics can do what they were not designed to do. Likewise, it is not possible to detect electronically, for example, where the transmission housing is leaking and fluid is escaping. However, it is possible to detect the effects of low fluid. A failure in gear monitoring would be recognized causing the control module to respond that both clutches are open (no traction).

You should know this during troubleshooting and also when working with the Volkswagen tester. It is possible that the cause for the malfunction might not be found during Guided Fault Finding  .

In addition to updating the software, much has been done to protect the transmission should there be a malfunction (safety features). And so, when necessary, malfunctions are saved and a replacement program is started.

Control Module Behavior During a Malfunction

If a component in the transmission malfunctions, the control module reacts with a replacement function. In order to protect the transmission, there are 4 different kinds of malfunctions:

1. The malfunction is so minor that it is possible to continue driving with a replacement program while maintaining driving safety. The driver is not notified of this via the selector lever transmission range display -Y5-. The display shows the selector lever position normally. When can changes in driving behavior actually be detected.
2. Individual lever positions blink in the selector lever transmission range display. The driver is shown that a desired gear selection is currently not possible. Example: Reverse, lever in "R" and vehicle drives backward. If "D" is engaged in this situation, the letter "D" blinks in the selector lever transmission range display. In this case, the control module prevents 1st gear from being engaged to avoid damaging the transmission. The gear is only engaged when the vehicle is stopped. If you want to test this, do so carefully!
3. The selector lever transmission range display is completely lit up and blinks. The selector lever position is indicated. Example: the transmission fluid temperature is too high. Reasons could include: towing a trailer with too large of a load, auxiliary installations on front of the vehicle, lack of cooling air.
4. The selector lever position cannot be recognized. The selector lever transmission range display blinks. Differences in the driving and shifting can definitely be felt. It is not possible to shift into reverse. There is a serious malfunction, a sub-transmission is switched off, transmission repair is necessary.