Transmission 9113 · 3 817 S peed senso r S tarter

Transmission 9113 3 817 S peed senso r S tarter interlo ck co ntact The speed sensors are used to determine the The starter interlock contact is used to detect transmission input and output speeds and when the selector lever is at "P" and "N". This also pass these signals on to the Tiptronic information is passed on to the Tiptronic con- control unit for further processing. trol unit. 3_07_00 3_08_00 10 – Speed sensor 1 – Plunger 11 – Speed sensor 2 – Permanent magnet 14 – Pulse rings 3 – Reed contact 15 – Flat spring The speed sensors (10 and 11) are fixed to Functional description the base via contact studs. The speed sen- sors are pressed against the transmission When the selector lever is at "P" and "N", the case by the flat spring (15) which is sup- permanent magnet (2) is moved away from ported by the slide valve box. This arrange- the reed contact (3) and thus opened. The ment ensures a defined gap between the Tiptronic control unit uses this electrical sig- speed sensors and pulse rings (14). nal to determine the position of the selector lever. This information is passed on to the AT F tem perature senso r DME control unit which then issues the start release. The ATF temperature has a major effect on the shifting time and, therefore, on shifting quality. By establishing the temperature of the ATF, it is possible to optimise shifting in all temperature ranges. The temperature switch is connected to the starter interlock switch in series, i.e. the temperature signal only reaches the Tiptronic control unit if the reed contact is closed. 3 - 16 Service Information 2002