Tiptronic diagnosis 911 Carrera (996) · 7. Sensor for ATF temperature 10. ABS control module

Tiptronic diagnosis 911 Carrera (996) 7. Sensor for ATF temperature 10. ABS control module Installationposition: The sensor is integrated in Installationposition: In the front luggage the transmission wiring harness. If it is damaged, compartment. the entire wiring harness must be replaced. The ABS control module is connected The sensor controls the modulation pressure to the Tiptronic control module. It transfers of the transmission in accordance with the ATF the front wheel speeds,which are required temperature. This keeps shifting operations very for slip monitoring and for calculation comfortable across the entire temperature range of the transverse acceleration. Furthermore, on vehicleswith Traction Control It the ATF temperature is too high, the control (TC),the Tiptronic control module is signalled module selects a map with the least power loss whether TC is active. The Tiptronic control possible and closes the torque converter clutch. module goes to a special map when this In addition, downshifting takes place at higher information is received. engine speeds. This reduces converter slip, and the ATF can cool down. 11. Brake light switch The sensor is regarded as defective if the signal Installationposition: In front of the brake pedal voltage exceeds or falls below the prescribed signal voltage range. Shifting then takes place The transmissioncontrol module needs with a substitute value of 80 °C. the signal from the brake light switch in order to trigger downshiftingbefore 8. Sensor for transmission input speed bends and to actuate the shiftlock solenoid. Installation position: On the hydraulic 12. Kick-down switch control unit in the transmission. Installationposition: In the accelerator The sensor (inductive pickup) transmits pedal box in front of the accelerator pedal. the transmission input speed to the transmission control module. Note 9. Sensor for transmission speed As the accelerator pedal box must not be opened,the complete accelerator pedal box Installationposition:Besidethe hydraulic must be replaced if the kick-downswitch control unitin the transmission. is defective. The sensor (inductive pickup) transmits The kick-downswitch detects when the the transmission speed (output speed) accelerator pedal is floored past the full-throttle to the transmission control module. position. It connects ground to the Tiptronic The control module calculates the vehicle speed from the transmission output speed. control module, which shifts the shifting times for faster acceleration.The transmission 37 -D 12 3701 DiagnosisjTroubleshooting, Tiptronic 99637Dl Printed in Gemlany -8, 1998.