Transmission Control Module (TCM) DTC Recognition

Transmission Control Module (TCM) DTC Recognition
The term "On Board Diagnostic" refers to the electrical/electronic part of the controls.

The control module is equipped with a Diagnostic Trouble Code (DTC) memory so that in the event of the failure of an electrical/electronic component, or in the event of an open circuit, the cause of the malfunction can be determined quickly.

The potential of the On Board Diagnostic (OBD) system can only be fully exploited with the V.A.G. 5051 Vehicle Diagnostic Measurement and Information System or with the V.A.G. 1551 scan tool, operating mode 1 "Rapid Data Transmission."

For functions which the V.A.G. 5051 Vehicle Diagnostic Measurement and Information System or the V.A.G. 1551 scan tool can cover.

Malfunctions are recognized by means of electrical signals. If malfunctions occur in the sensors or components being monitored, they are stored in the DTC memory indicating the type and location of the malfunctions.

If a malfunction is present, it is saved as a statistical error. If the malfunction occurs only briefly and is then no longer present, it becomes an intermittent malfunction after the ignition is switched off and on again.

Malfunctions occurring sporadically (intermittently, occasionally) are displayed on the screen as "sporadic."

After 40 engine cold starts (followed by transmission warm-up) the sporadic malfunctions are automatically deleted from the DTC memory

A maximum of 10 trouble codes are stored in the DTC memory. If an eleventh trouble code should be detected with 10 statistical trouble codes, emergency shutoff takes place.

If 10 trouble codes have already been saved in the DTC memory but they are not all statistical, and an eleventh trouble code is added, the oldest existing sporadic trouble code is overwritten.