Golf L4-2.0L (AEG) (1999)
Information Bus: Testing and Inspection
CAN-Bus, checking
CAN-Bus, checking (through m.y. 1999)
1 - Engine Control Module (ECM)
2 - ABS control module
3 - Transmission control module
4 - CAN-Bus
Function
The Engine Control Module (ECM) (item -1-)communicates with the ABS control module (item -2-) and the transmission control module (item -3-)
via a CAN-Bus (item -4-).
At least two control modules capable of CAN-Bus are connected together via two CAN-Bus wires which are a twisted pair (CAN_High and
CAN_Low) and exchange information (messages). Missing information on the CAN-Bus will be recognized as a malfunction by the ECM as well as
by other CAN-Bus control modules.
Two control modules have 120 terminal resistors which make sure that the CAN-Bus can function without malfunctioning. These terminal resistors are
located in the engine and ABS control modules.