TCM -J217- malfunction recognition
If a malfunction exists it is stored as a static malfunction. If the malfunction no longer exists after a predetermined period or distance travelled, it is considered a sporadic malfunction.
Sporadic malfunctions are stored in the memory and displayed as "sporadic malfunctions" when retrieved by the VAG 1551 Scan Tool. "SP" appears on the right of the display in such cases. If the printer is switched on, sporadic malfunctions are printed out after the malfunction is addressed.
Malfunctions which are stored in the memory as sporadically occurring malfunctions are automatically erased after 1,000 km (625 miles) or 20 hours.
Inoperative CAN-Bus signals will be detected by the control module on vehicles equipped with CAN-Bus. Faulty CAN-Bus wiring e.g. open circuits, can be directly detected. Conclusions cannot be drawn as to where the CAN-Bus wiring is faulty until all control module DTC memories have been checked.