AT Control Module

Location/Task/Function

Component Illustration:

Input and output signals

Component Illustration:

CAN data bus

Location
In the right footwell, on the center console.

Purpose
The ETC control module (N15/3) determines the instantaneous operating condition of the vehicle and controls all gearshift sequences taking into account the ease of shifting and the driving situation.
This involves receiving, converting and transmitting various digital and analog signals.

It receives operating data in the form of input signals from:
Starter interlock contact (Y3/6s1)
Rpm sensor 2 (Y3/6n2)
Rpm sensor 3 (Y3/6n3)
Transmission oil temperature sensor (Y3/6b1)

It is also linked over the engine compartment bus with:
Instrument cluster (A1)
Engine control module (ME-SFI) (N3/10)
Electronic selector lever module control module (N15/5)
Traction systems control module (N47)
Transfer case control module (N78)

The solenoid valves for the modulating and shift pressure and for the gear changes are actuated by the ETC control module (N15/3).

Function
The necessary pressure in relation to the torque to be transmitted, is computed from all the input signals. This involves the processing of the following data from other systems:

Engine control module (ME-SFI) (N3/10)
Engine torque
Engine speed
Accelerator pedal position
Shift offset
Engine status

Electronic selector lever module control module (N15/5)
Kickdown switch (S1616)
Selector lever position

Traction systems control module (N47)
Wheel speeds
Shift offset Traction status

Transfer case control module (N78)
Position of transfer case (off-road or on-road ratio)

The following information is output over CAN-C:

Engine control module (ME-SFI) (N3/10)
Kickdown switch (S16/6)
Engaged drive mode
Selector lever position P/N

Traction systems control module (N47)
Transmission ratio
Wheel speeds

Instrument cluster (A1)
Selector lever position / shift range

Related Information: