| The engine control unit communicates with the ABS control unit via a data bus CAN. |
| These control units, designed for data bus, are interconnected by means of two data bus wires twisted round each other (CAN_High and CAN_Low) and interchange information (messages). The lack of information in the data bus is interpreted as a fault by the engine control unit and by the ABS control unit, interconnected via the data bus CAN. |
| In order to function without static problems, the data bus CAN needs the control units in front of the bus CAN controller to have a matching resistor of 120 Ω each. These matching resistors are found at the control units of the engine and of the ABS. |
| Special tools and workshop equipment required |
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| Test box -V.A.G. 1598/21- |
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| Test box -V.A.G. 1598/31- |
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| Hand-held multimeter -V.A.G. 1526- or multimeter -V.A.G. 1715- |
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| Auxiliary measurement set -V.A.G. 1594 A- or -V.A.G. 1594 C- |
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