HEXA

TRANSMISSION

Transmission System Overview

The 6L50 is a six speed transmission for rear and all-wheel drive vehicle, electronically controlled. Changing

gear ratios is fully automatic and is accomplished through the use of a Transmission Control Module (TCU)

located within the transmission. The transmission module receives and monitors various electronic sensor

inputs and CAN data to calculate and command gear ratio change.

The interface between the control modules and components are showed in the following block diagram

which includes:

-TCU (Transmission Control Unit).

-EMS (Engine Management System).

-BCM (Body Control Module) if equipped.

-Electrical components: IMS (internal Mode Switch), speed sensors, temp sensor.

The transmission module is connected to the

vehicle with a pass through 16 pins connector. The

communication with the other vehicle modules is

completed via the CAN bus. The CAN bus is

application specific. The variety of gear ranges in

the automatic transmission is made possible

through the interaction of numerous mechanically,

hydraulically

and

electronically

controlled

components inside the transmission. At the

appropriate time and sequence, these components

are either applied or released and operate the

gears that a gear ratio consistent with the driver’s

needs.