OBD Functions

On Board Diagnostic (OBD)

The automatic transmission is controlled electro-hydraulically.

The term "On Board Diagnostic (OBD)" is specifically for the electronic/electric control.

The transmission control module -J217- 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.

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

Safety Functions Of Transmission Control Module

If malfunctions occur in the monitored sensors or components, these are stored in the DTC Memory together with an indication of the type of malfunction.

Malfunctions which only occurrence, are known as sporadic malfunctions (temporary). Sporadic malfunctions are additionally identified as such.

After analyzing the information the automatic transmission control module distinguishes between sporadic and static (permanent) malfunctions and stores these.

If malfunctions do not reoccur within minimum 5km (3 miles) or 6 minutes, maximum 20 km (12 miles) or 24 minutes, they are stored as sporadic malfunctions.

Electrical malfunctions that affect vehicle performance can be determined with the Scan Tool VAG 1551, or equivalent.

The possibilities offered by On Board Diagnostic (OBD) can only be fully exploited with operating mode 1 "Rapid data transfer of Scan Tool VAG 1551.

For functions which the Scan Tool VAG 1551 can register refer to List of Selectable Functions.