General Information

On Board Diagnostic (OBD), Features

The Motronic Engine Control Module (ECM) - J220- is equipped with Diagnostic Trouble Code (DTC) memory.

If malfunctions occur in the sensors and components being monitored, they will be stored in the Diagnostic Trouble Code (DTC) memory as a DTC together with an indication of the type of malfunction.

After evaluating incoming data, the Motronic Engine Control Module (ECM) -J220- chooses between 154 different DTCs and stores them until DTC memory is checked and erased.

Malfunctions which only occur sporadically will have the words "sporadic malfunction" shown on the print out. These malfunctions will be indicated on the display by the suffix "/SP." Sporadic malfunctions can be caused by a loose connection or a brief open circuit. If a sporadic malfunction does not occur again within 40 driving cycles (engine start with engine coolant temperature below 50 °C and switched off above 72 °C), it will be automatically be erased from DTC memory.

Stored DTCs can be displayed using the VAG1551 Scan Tool (ST), VAG1552 mobile scan tool or the VAS5051 vehicle diagnostic, testing and information system.

DTC memory must be erased after the DTCs have been erased and the readiness code must be generated again.

All values recognized by the Motronic Engine Control Module (ECM) -J220- will be erased when the Motronic Engine Control Module (ECM) -J220- harness connector or the battery is disconnected. However, the contents of DTC memory are retained.

When the engine is restarted, the idle could be rough for a brief period. In this case, leave the engine running for a few minutes at idle or perform a longer test drive, until the learning process is completed.

NOTE:
General information for On Board Diagnostic (OBD) can be found in the instruction manual of the VAG1551 Scan Tool (ST), VAG1552 mobile scan tool or the VAS5051 vehicle diagnostic, testing and information system.