| The engine control unit -1- communicates with the ABS control unit -2- and the gearbox control unit -3- over the CAN databus. |
| These control units are interlinked by a databus line (CAN High and CAN Low) and exchange information (messages). |
| If information is not received over the databus this is detected both by the engine control unit as well as by other control units as a fault (e.g. by the ABS control unit). |
| A terminating resistance of 66 Ω is required for the CAN databus to operate properly. Such a resistance is integrated in the engine control unit. |
| Special tools and workshop equipment required |
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| Handheld multimeter, e.g. -V.A.G 1526A- |
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| Measuring tool set, e.g. -V.A.G 1594A- |
| For engines with identification characters AEG, APK, AQY |
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| Test box -V.A.G 1598/21- |
| For vehicles with ABS+ESP |
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| Test box -V.A.G 1598/33- |
| For engines with identification characters AZH, AZJ |
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| Test box -V.A.G 1598/31- |
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