Overview
This document contains information on:
General
Function
General
The gearshift system is responsible for changing between the various gears of the transmission.
Function
The fully integrated transmission controller unit converts the electrical signals coming from the fully integrated transmission control unit into hydraulic signals. Gear ranges "R", "N", "D1" to "D9", and "P" can be engaged by operating the DIRECT SELECT lever. The DIRECT SELECT lever transmits information regarding the selected drive range "P", "R", "N", "D1" to "D9" to the steering column tube module control unit, which sends the signal on chassis CAN 1. Here, the signal is registered by the CDI control unit and relayed over the drive train CAN to the fully integrated transmission control unit. The corresponding gear range is then engaged.
The shift range for engaged drive range "D1" to "D9" is displayed in the instrument cluster. Although the shift range can be changed in the forward gears while driving, the fully integrated transmission control unit prevents a shift operation if the engine speeds are too high or too low.
Upshifts and downshifts
In the Sport "S" and Economy "E" drive programs, the driver can select the following functions by pressing the steering wheel downshift button or the steering wheel upshift button:
Operating the steering wheel gearshift buttons in transmission mode "E" or "S" activates the short-term M mode. This enables the driver to change gear using the steering wheel gearshift buttons without having to select the short-term mode M program beforehand. The previous gear limitation/shift into optimum gear (SOG) function using the steering wheel gearshift buttons has been discontinued.
In contrast to the continuous M program, the short-term M program is deactivated automatically after a specific period. This time interval starts again after every additional press of a button. The activity of the function is extended depending on the wide open throttle and lateral acceleration involved.
There is a shorter shift range (shifting at low engine speed) in drive program "E" compared to drive program "S" and so a lower drive torque is available for forward travel and reversing. This allows for more economical and comfortable driving because the gears are not driven to the limit.
In drive program Manual "M", the individual gears "1" to "9" can be engaged directly via the steering wheel downshift button or the steering wheel upshift button.
It is only possible to shift into the reverse gear and neutral using the DIRECT SELECT lever. The park pawl (gear range "P") is activated by operating the park pawl on the DIRECT SELECT lever.