Control Module Malfunction Behavior

6 Spd. Direct Shift Automatic Transmission 02E

Control Module Malfunction Behavior
The control module with highly developed software. This software is able to perform, monitor and control electrical functions within milliseconds. Everything that the modern transmission electronics has to offer, is contained in this control module. Be sure to note this when 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 oil is escaping. However, it is possible to detect the effects of low oil. 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.
Aside from the software that makes it possible for the transmission to operating, much was also done to protect the transmission in case of a malfunction (safety functions). If necessary, if a malfunction occurs, it is stored in the DTC memory 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 as much as possible, 4 malfunction reactions are differentiated:
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 Y5. This informs the driver that this gear can presently not be selected. An example: Reverse, lever in R and vehicle dives backward. If D is engaged in this situation, the letter D blinks in the selector lever transmission range display Y5. In this case, the control module prevents 1st gear from being engaged to avoid damaging the transmission. The gear is only engaged when vehicle is stopped. If you want to test this, do so carefully!
3. The selector lever transmission range display Y5 is completely lit up and blinks. The selector lever position is indicated. An example of this: Transmission oil temperature is too high. Reasons can be, among other things: Towing trailer with too large of a load, auxiliary installations on front of vehicle, lack of cooling air.
4. Selector lever position cannot be recognized, selector lever transmission range display Y5 blinks, changes in driving and shift behavior can be clearly detected, reverse not possible. If there is a serious malfunction, then a sub-transmission is switched off and transmission repair is necessary.