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Test the signal from the air conditioning for the adaptation of engine revs > < Test air conditioning compressor cut-out

Leon Mk2

Test process
Test process
–  Attach the -V.A.G. 1551- (-V.A.G. 1552-) and, with corresponding “address code” 01, select the engine electronics control unit. When doing so, the engine must be running at idling revs. (Fault reader: connecting and selecting the engine electronics control unit → Vehicle diagnosis, testing and information system VAS 5051.)
   
Reading on the display:
–  Press 0 and 3 for the function “Final control diagnosis”.
  
Rapid data transmission             HELP
Select function XX
Reading on the display:
–  Confirm the entry with the Q button.
  
Rapid data transmission                Q
03 - Final control diagnosis
Reading on the display:
–  Press →.
  
Final control component diagnosis      →
Exhaust recirculation valve -N18
Reading on the display:
Air conditioning compressor cut-out is tested.
The air conditioning compressor should cut out within 5 s (visual check), and then start up every 5 s and cut out again.
If the air conditioning compressor does not cut out:
–  Continue the final control diagnosis to the end.
–  Press 0 and 6 for the function “End transmission” and confirm the entry with the Q button.
  
Final control component diagnosis      →
Air conditioning compressor, ready
–  Attach the test box -V.A.G. 1598/31- to the wiring harness of the control unit.
–  Test for open circuits in the wiring between test box female contact 29 and the air conditioning, following the wiring diagram. Wiring resistance: 1.5 Ω max. → Current flow diagrams, Electrical fault finding and Fitting locations
  E23-0032

Test the signal from the air conditioning for the adaptation of engine revs > < Test air conditioning compressor cut-out