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Ignition system, glow plug system > < Speed signal: checking

Leon Mk2

Signals for air conditioning and air conditioner compressor: checking
Signals for air conditioning and air conditioner compressor: checking
By these signals from the air conditioning, the prior control value of the idling stabilisation is raised when connecting the air conditioning compressor. In this way, idling stabilisation is maintained at an average value within the regulation margin.
Special tools and workshop equipment required
   
t  Hand multimeter -V.A.G 1526 A- or multimeter -V.A.G 1715-
t  Fault reader -V.A.G 1551- or vehicle system tester -V.A.G 1552- with cable -V.A.G 1551/3B-
t  Auxiliary measuring set -V.A.G 1594 C-
  W00-0431
t  Test box -V.A.G 1598/18-
t  Current flow diagram
Checking conditions
l  Air conditioner functioning OK.
l  Air conditioner must be switched off.
l  No faults should be stored in fault memory → Chapter, Fault memory: interrogate.
l  Vehicle must be at room temperature (warmer than +15 °C).
Checking process
–  Connect fault reader -V.A.G 1551- (-V.A.G 1552-). Start engine and enter “address code” 01 to select engine control unit. (Fault reader: Connecting and selecting the engine control unit → Chapter.)
  W00-0478
Indicated on the display:
–  Press keys 0 and 8 for the function “Read measured value block” and confirm entry with the Q key.
  
Rapid data transfer                 HELP
Select function XX
Indicated on the display:
–  Press keys 0, 0 and 1 for “Display group number 1” and confirm entry with the Q key.
  
Read measured value block           HELP
Input display group number XXX
Indicated on the display: (1…4 = display zones)
–  Observe 8-digit number block in display zone 4.
   The 3rd digit from the left should be a 0.
   Display: 00000000
–  Switch on air conditioning system.
–  Switch on air conditioning system. Select lowest temperature and highest blower speed.
   The 3rd position on the left must be a 1.
   Display: 00100000
–  Go to display group 4 by pressing:
   key 3 three times in the case of -V.A.G 1551- equipment
   key ↑ three times in the case of -V.A.G 1552- equipment
  
Read measured value block 1           ->
         1         2         3         4
Indicated on the display: (1…4 = display zones)
–  Select lowest temperature and highest blower speed.
–  Observe 8-digit number block in display zone 4.
   The 2nd digit on the right should be 1.
   Display: 01000011
If the display does not change:
  
Read measured value block 4           ->
         1         2         3         4
–  Connect test box -V.A.G 1598/18- to control unit wiring harness.
–  Check wiring for open circuits between test box sockets 33+35 and air conditioner using current flow diagram.
   Wire resistance: 1,5 Ω max.
  N24-0334

Ignition system, glow plug system > < Speed signal: checking