Automatic Transmission/Transaxle: Description and Operation

27. Transmission

26.1 Automatic Transmission (Cayenne models)

This chapter is only valid for Cayenne models.

General Description
The gearbox is fitted with a oil temperature sensor, 2 rotation speed sensors (in/out), a shift lever sensor and 1 for reverse gear. Based on these sensors the diagnosis is checking if the gearbox is working correctly. For controlling the gearbox there are 7 pressure regulators and 2 magnetic valves necessary.
With the pressure regulators the clutches, the cooling, the system are controlled. The magnetic valves are need for the selection of the clutches. Also there's one valve for thermo management. BUS system is CAN.

1. Start Stop

For start stop function there is an Electrical oil pump needed. It is controlled via driver. The ATCU detects temperature and failure of EOP via CAN.

2. Plausibility Checks

2a. Shift lever diagnosis
Based on the driver action the movement of the shift lever were checked by the shift lever sensors with several plausibility checks. Also the sensors can detect manual shifting.