With Manufacturer's Scan Tool

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 and stores them until the DTC memory is erased. Engine Control System P Code Charts
- 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 Reading Diagnostic Trouble Codes







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 Reading Diagnostic Trouble Codes

After erasing DTC memory, set the readiness code again.


NOTE: On Board Diagnosis (OBD) information can be found in VAG 1551 Scan Tool (ST) instruction manuals, vehicle system tester VAG 1552 or the new VAS 5051 ST.