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Checking engine speed signal > < Checking CAN matching resistor

A4 Mk1

Checking cut-out signal
Checking cut-out signal
The cut-out signal switches off the engine. It is transmitted by the engine control unit to the injection pump along a separate wire in the following cases:
t  When the driver switches off the ignition.
t  If the engine control unit detects a fault and has to switch off the engine as a precaution
–  Unplug connector from injection pump.
–  Connect test adapter -V.A.G 1598/30- or -V.A.G 1598/31- to wiring harness for engine control unit. Do not connect engine control unit → Chapter.
   
Test the following wiring connections for open circuits and short to positive or negative.
  A23-0055
9-pin connector, contact-V.A.G 1598/30-, socket-V.A.G 1598/31-, socket
53/21114

–  Rectify open circuit or short circuit in wiring as necessary → Current flow diagrams, Electrical fault finding and Fitting locations.
   

Checking engine speed signal > < Checking CAN matching resistor