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Checking intake air preheating > < Checking fuel pressure regulator and holding pressure

Leon Mk2

Checking intake air system for leaks (unmetered air)
Checking intake air system for leaks (unmetered air)
Checking with engine 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 ignitability 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.
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 1551/3A-
t  Engine leak detector spray -G 001 800 A1-
Test conditions
l  Coolant temperature must be at least 80 °C, ⇒ display group 04, display zone 3.
Test sequence
–  Remove air cleaner → Fig..
–  Connect fault reader -V.A.G 1551- (-V.A.G 1552-). Start engine and select “Address word” 01 of engine control unit. When doing this the engine must be running at idling speed. (Connecting fault reader and selecting engine control unit → Vehicle diagnosis, testing and information system VAS 5051.)
   
Indicated on display:
–  Press keys 0 and 8 for the function “Read measured value block” and confirm entry with Q key.
  
Rapid data transfer                 HELP
Select function XX
Indicated on display:
–  Press keys 0, 0 and 1 for “Display group number 1” and confirm entry with Q key.
  
Read measured value block               
Input display group number XXX
Indicated on display: (1...4 = Display zones)
Only continue with the test when
l  The coolant temperature exceeds 80 °C -display zone 2-
–  Observe the engine speed in display zone 1 and the Lambda regulation in display zone 3.
–  Systematically spray parts of the intake system with engine leak detector spray.
If the engine speed drops or the Lambda regulator changes:
–  Press → key.
–  Press keys 0 and 6 for the function “End output” and confirm entry with the Q key.
–  Switch off ignition.
–  Check sprayed areas of intake system for leaks and rectify if necessary.
If the engine speed or Lambda regulator does not change:
–  Press → key.
–  Press keys 0 and 6 for the function “End output” and confirm entry with the Q key.
–  Switch off ignition.
  
Read measured value block      1       →

      

      

    


Checking intake air preheating >
< Checking fuel pressure regulator and holding pressure