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Engine control unit > < Spray pattern and leaks checking

Leon Mk1

Data bus matching resistor checking
Data bus matching resistor checking
Special tools and workshop equipment required
   
t  Hand multimeter -V.A.G 1526A- or -V.A.G 1715-
  W00-0431
t  auxiliary measuring set -V.A.G 1594 A- or -V.A.G 1594 C-
t  Current flow diagrams
Function
Communication between the engine control unit and all the data bus compatible control units is produced via a CAN data bus.
Data bus compatible control units are connected together via two data bus wires twisted together (CAN_high and CAN_low) and exchange information (messages). Information not available in the data bus will be recognised as a fault by the engine control unit as well as other CAN data bus control units.
The CAN data bus requires a matching resistor to function fault free. This final central resistor is located in the engine control unit.
Checking conditions
l  A fault has been detected in the CAN data bus → Chapter.
Test sequence
–  Switch ignition off.
–  Release connectors from control unit and pull off.
  W00-0477
–  Check centralised matching resistor in engine control unit with the multimeter and adaptor cables of the -V.A.G 1594 A- or -V.A.G 1594 C- between:
  E24-0066
Connector, contactConnector, contact
3132
Specification: 60 … 72 Ω

If the resistance measurement is outside the specified range:
–  Renew engine control unit: → VAS 5051; Vehicle self-diagnosis.
If the resistance value is within the specified range:
–  Repair the electrical installation fault following the current flow diagrams.
   

Engine control unit > < Spray pattern and leaks checking