Checking bus system
The DTC table indicated that data exchange via the bus should be checked
- Check to be sure the multi-pin connectors of the control modules are securely connected.
- Connect the VAS 5051 tester or VAG 1551 scan tool. See «VAS 5051 TESTER OR VAG 1551 SCAN TOOL, CONNECTING AND SELECTING FUNCTIONS»(/audi/a8/d2-1999-2002/remont/collisionavoidance/#on-board-diagnostic-obd) .
- Switch ignition on
- Switch printer on via the PRINT button (indicator lamp in button lights up).
- Press button 1 to select "Rapid data transfer" operating mode 1.
Indicated on display
Scheme 218
Note. The address word 00 initiates the automatic test sequence, i.e. it results in a DTC check on all OBD capable systems in the vehicle via rapid data transfer.
When a control module responds with its identification, the display indicates the number of stored DTCs or indicates "no malfunctions recognized."
DTCs stored in the system are indicated sequence and printed out. Then the VAG 1551 scan tool sends the next address word.
Automatic test sequence is over when the following indication appears on the display
Scheme 219
If a malfunction involving" ... databus" or" ... no communication" is indicated
- Check whether the correct control module for this vehicle is installed (part number and coding).
If the correct control modules are installed, check the CAN bus system.