With Manufacturer's Scan Tool

On Board Diagnostic, 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 different malfunctions Diagnostic Trouble Code (DTC) table 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 50 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 degree C (120 degree F) and runs continuously until the temperature reaches 71 degree C (160 degree F).

Malfunctions can be read with Scan Tool (ST) VAG 1551, VAG 1552 or VAS 5051. Clearing 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.

The stored malfunctions can be read out with the fault reader VAG 1551, the vehicle system tester VAG 1552, or with VAS 5051. Clearing Diagnostic Trouble Codes

The fault memory must be erased after the faults have been eliminated and the readiness code must be set again.
Clearing Diagnostic Trouble Codes
Monitors, Trips, Drive Cycles and Readiness Codes

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