On Board Diagnostic (OBD II): Function

WARNING: This page is about a different car, the 2002 Volkswagen Cabrio, 2001 Volkswagen Cabrio, and 2000 Volkswagen Cabrio. However, it is still accessible from the selected car via links, so may be relevant.

The Engine Control Module (ECM) -J220- for the fuel injection and ignition system is equipped with a Diagnostic Trouble Code (DTC) memory.

If malfunctions occur in the sensors and components being monitored, they will be stored in the DTC memory together with an indication of the type of malfunction.

Malfunctions which only occur sporadically will be indicated on the display by the addition "/SP". The cause of sporadic malfunctions can be e.g. a loose contact or a brief open circuit. If a sporadic malfunction does not occur again within 40 engine starts, it will be erased from DTC memory.

The stored DTCs can be printed out/displayed by checking the DTC memory. See Diagnostic Trouble Code (DTC) memory .

After malfunctions have been eliminated, DTC memory must be erased (see Diagnostic Trouble Code (DTC) memory ) and the repair must be verified via the appropriate display group (see READINESS CODE, GENERATING ).

The readiness code must be created each time the DTC memory is erased and when the voltage supply to ECM -J220- is interrupted.