Safety functions of Transmission Control Module (TCM) -J217-

The TCM -J217- receives information from components that effect the selection of gears and passes the information on to solenoid valves in the valve body.

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

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 occur once are known as sporadic (temporary) malfunctions. Sporadic malfunctions are additionally identified as such.

After analyzing the information the TCM distinguishes between sporadic and static (permanent) malfunctions (Refer to Diagnostic Trouble Code (DTC) table  ) and stores these.

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

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

The diagnostic possibilities can only be fully exploited with operating mode 1 "Rapid data transfer" of the VAG 1551 Scan Tool.

For a list of functions which the VAG 1551 Scan Tool can register. Refer to List of selectable functions  .