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Testing signals from and to automatic gearbox
Testing signal wire (CAN bus) between engine control unit and gearbox control unit
The engine control unit and the gearbox control unit are connected to each other via a CAN bus. The CAN bus consists of two signal wires which are used to transmit information (e.g. engine speed and accelerator pedal position).
Test sequence
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‒ Connect test box V.A.G 1598/31 to wiring harness for engine control unit.Do notconnect to the engine control unit itself:
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‒ Connecting test box to engine control unit without protective housing=>Page 23-49.
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‒ Connecting test box to engine control unit with protective housing=>Page 23-51.
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‒ Test for open circuit and short to earth or positive in the following wiring connections:
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Test box
V.A.G 1598/31
Socket
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Automatic gearbox control unit
Contact
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6
7
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=> Current flow diagrams, Electrical fault-finding and Fitting locations binder
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‒ Rectify any open/short circuit as necessary.
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