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Special tools and workshop equipment required
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◆ V.A.G 1526 A
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◆ V.A.G 1594 A
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◆ V.A.G 1598/31
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◆ VAS 5051 with VAS 5051/1
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◆ V.A.G 1551 with V.A.G 1551/3 A
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‒ Interrogate fault memory of ABS control unit.
If a fault relating to the CAN bus appears on the display:
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‒ Connect test box V.A.G 1598/31 to wiring harness for engine control unit. Do not connect to the engine control unit itself.
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‒ Test for open circuit and short to positive or earth in the following wiring connections:
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Test box
V.A.G 1598/31
Socket
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ABS control unit
-J104
Contact
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58
60
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=> Current flow diagrams,
=> Electrical fault-finding
=> and Fitting locations binder
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‒ Rectify short circuit or open circuit if necessary.
If the wiring is OK:
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‒ Try renewing first the ABS control unit, then the engine control unit.
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