On Board Diagnostic (OBD), Function

On Board Diagnostic (OBD), function
The automatic transmission is controlled electrohydraulically.
On Board Diagnostic (OBD) or"self-diagnosis" is specifically for the electronic/electric control of the transmission.

Functions of transmission control module
The control module receives information from components that effect selection of gears and passes the information on to solenoid valves that control the valves in the valve body.

In the dynamic shift program the control module adapts itself to the existing driving resistance (e.g. gradients, trailer) as well as to the driver s driving style (e.g. sporty driving style) and selects the corresponding shift points.

The control module is equipped with a Diagnostic Trouble Code (DTC) memory so that in the event of an electronic/electrical component failure or on open circuit the DTC can be determined quickly. DTC's are recognized by electrical signals and stored in the DTC memory.