On Board Diagnostic (OBD II): Function

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 1999 Volkswagen Jetta, 1999 Volkswagen Golf, 1999 Volkswagen Cabrio, 1998 Volkswagen Jetta, and 1998 Volkswagen Golf. 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 wi 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 malfunctions are output after initiating the malfunction display: see Check DTC Memory (scan tool function 02) .

After malfunctions have been eliminated, DTC memory must be erased (see ERASE DTC MEMORY (SCAN TOOL FUNCTION 05) ) and the repair must be verified via the appropriate display group )see READINESS CODE, CREATING ).

The readiness code must be created each time the DTC memory is erased and when the voltage supply to ECM -J220- is interrupted: See READINESS CODE, CREATING .