| Data bus compatible control units are connected together via two data bus wires twisted together (CAN high and CAN low) and exchange information (messages). Information not available in the data bus will be recognised as a fault by the engine control unit as well as other CAN data bus control units. |
| The CAN data bus requires a matching resistor of 66 Ω for each one to function fault free. This matching resistor is located in the engine control unit. |
| Special tools and workshop equipment required |
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| Test box -V.A.G 1598/31- |
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| Hand multimeter -V.A.G 1526 A- or multimeter -V.A.G 1715- |
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| -V.A.G 1594 A- or auxiliary measuring set -V.A.G 1594 C- |
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