CAN-bus, checking (from MY 2000): Notes
Function
The Engine Control Module (ECM) communicates with all control modules capable of data bus via CAN data bus.
The control modules capable of data bus are connected together via two data bus wires twisted together (CAN high and CAN low) and exchange information (messages). Missing information on the data-bus is recognized as a malfunction by the Engine Control Module (ECM) as well as by other CAN-bus control modules.
Further information WSP 521 419 00The CAN data bus.
The data bus requires a matching resistor to function fault free. This central matching resistor is located in the engine control module.
NOTE:
- Read which control modules are actively connected via data bus to the engine control module in measured value blocks 125 and 126.
Special tools, testers and auxiliary items required
- Test box V.A.G 1598/31
- Hand multimeter V.A.G 1526 or multimeter V.A.G 1715
- Adapter set V.A.G 1594
- Wiring diagram