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Signals from/to air conditioning: testing > < Test condition

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 8 for the function “Read measured value block” and confirm the entry with the Q button.
  
Rapid data transmission             HELP
Select function XX
Reading on the display:
–  Press 0, 0 and 6 for “Display group number” and confirm the entry with the Q button.
–  Do a road test, and compare the reading on the display (a second person is needed) with the reading on the speedometer.
  
Read measured value block               
Enter value group number             XXX
Target value, display field 1: approx. running speed.
–  Press →.
–  Press 0 and 6 for the function “End transmission” and confirm the entry with the Q button.
If no speed is indicated:
–  Switch off the ignition.
  
Read measured value block 6            →
55 km/h      0 0 0      60.5 %       255
–  Attach the test box -V.A.G. 1598/31- to the wiring harness of the control unit.
–  To measure the voltage attach the multimeter between female contacts 4/5 + 20 of the test box.
–  Switch on the ignition.
–  Raise the vehicle at the left front.
–  Turn the front wheel and watch the voltage reading. Target value: oscillating between 0 and at least 10 volts
–  If the value displayed does not oscillate:
–  Test for open circuits or short circuits in the wiring from contact 20 of the engine control unit connector, to the instrument panel. → Current flow diagrams, Electrical fault finding and Fitting locations
  E23-0032

Signals from/to air conditioning: testing > < Test condition