A3 Mk1
Checking auxiliary signals
Testing signal wire 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 (Controller Area Network) bus. The CAN bus consists of two signal wires which are used to transmit information (e.g. engine speed and accelerator pedal position).
Check the following wiring connections for open circuit and short circuit to positive or negative.
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