Malfunction recognition by the TCM

WARNING: This page is about a different variant/trim than selected.

The TCM is equipped with Diagnostic Trouble Code (DTC) memory. Malfunctions that occur in the monitored sensors, components, or wiring are stored in DTC memory, which can be checked using the VAG 1551 or VAG 1552 Scan Tool (ST). If the printer of the VAG 1551 scan tool is switched on, the DTCs will be printed. See DTC TABLE .

The On Board Diagnostic (OBD) system differentiates between "static" and "sporadic" malfunctions. Static malfunctions are stored until DTC memory is checked and then erased using the VAG 1551 scan tool. If a malfunction that has been stored as "static" no longer exists after the ignition is switched on, it will be converted to "sporadic."

Malfunctions that occur sporadically are identified by the 7SP" designation in the VAG 1551 scan tool display. A sporadic malfunction is automatically erased after 40 engine cold-starts (and subsequent transmission warm-ups).

The OBD program can be initiated using the VAG 1551 scan tool in "Rapid data transfer" operating mode 1.

For a list of OBD functions accessible using the VAG 1551 scan tool, see ON BOARD DIAGNOSTIC (OBD II), FUNCTIONS .