On Board Diagnostic II: Notes

• On Board Diagnostic II, features The Engine Control Module -J248- (ECM) for the Diesel direct fuel injection (DFI) 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 DTC memory together with an indication of the malfunction type.
• After evaluating the information, the ECM decides between 85 different malfunctions Diagnostic Trouble Code (DTC) table, see DTC table: VAG codes  or DIAGNOSTIC TROUBLE CODE (DTC) TABLE: SAE P CODES  and stores them until the DTC memory is erased.
• Malfunctions which only occur sporadically will have the addendum "sporadic" on the print out. These malfunctions will be indicated on the display by the addendum "/SP". The cause of sporadic malfunctions can be e.g. a loose terminal or a brief open circuit. If a sporadic malfunction does not occur again within 40 warm-up cycles, it will be erased from DTC memory.
• The warm-up cycle is designated by each engine start, beginning at an Engine Coolant Temperature below 49 °C (120 °F) and runs continuously until the temperature reaches 71 °C (160 °F).

Malfunctions can be read with Scan Tool (ST) VAG 1551, VAG 1552 or VAS 5051, see DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING .

If malfunctions that influence exhaust emissions are recognized, Malfunction Indicator Lamp -K83- (MIL) -1- illuminates.

If malfunctions are recognized that affect driveability, the glow plug indicator lamp -2- blinks.

DTC memory must be erased after malfunctions have been eliminated, see DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING 

After erasing DTC memory, set the readiness code again, see READINESS CODE, SETTING .