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Checking intake air preheating: checking > < Fuel pressure regulator and holding pressure: checking

Leon Mk2

Intake system: Checking for leaks (unmetered air)
Intake system: Checking for leaks (unmetered air)
Special tools and workshop equipment required
   
t  Fault reader -V.A.G 1551- or vehicle system tester -V.A.G 1552- with cable -V.A.G 1551/3B-
t  Leak detector spray -G 001 800 A1-
  Note!
t  The vacuum in the intake system will cause the leak detector spray to be drawn in with the unmetered air. The leak detector spray reduces the flammability of the mixture. This leads to a drop in engine speed and to a change of Lambda probe reading.
t  The safety precautions listed on the container must be adhered to.
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.)
  W00-0459
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)
–  Store the engine speed shown in display zone 1.
–  Store the Lambda probe voltage shown in display zone 3 and its margin of oscillation.
–  Systematically, spray parts of the intake system with engine leak detector spray.
Engine speed or Lambda probe voltage does not change:
–  Press the → key.
–  Press keys 0 and 6 for the “End output” function and confirm input with the Q key.
If the engine speed drops or the Lambda probe voltage changes:
–  Press the → key.
–  Press keys 0 and 6 for the “End output” function and confirm input with the Q key.
–  Check sprayed areas of intake system for leaks and rectify if necessary.
  
Read measured value block 1           ->
         1         2         3         4

Checking intake air preheating: checking > < Fuel pressure regulator and holding pressure: checking