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Intake air preheating: check > < Test condition

Leon Mk2

Testing procedure
Testing procedure
  Note!
t  Due to the vacuum in the intake system, the leak detecting spray is sucked in together with the undue air. The spray reduces the flammability of the fuel mixture. This way, a drop in engine speed occurs, as well as a variation in Lambda probe voltage.
t  Follow the safety rules on the container unconditionally.
–  Attach the unit -V.A.G. 1551- (-V.A.G. 1552-). Start the engine and enter “direction code” 01 to select the engine control unit. (Fault finder: Connect and select the engine control unit → Vehicle diagnosis, testing and information system VAS 5051.)
   
Display reading:
–  Press buttons 0 and 8 for the function “Read the measurement values block” and confirm the entry with the Q button.
  
Rapid data transfer                 HELP
Select function XX
Display reading:
–  Press buttons 0, 0 and 1 for “display group 1” and confirm the entry with the Q button.
  
Read measurement values block       HELP
Enter display group number XXX
Display reading: (1...4 = display fields)
Proceed with testing only when the following are complied with:
l  Coolant temperature, 85 °C display field 2.
–  Observe engine speed in display field 1 and Lambda probe voltage in display field 3.
–  Systematically apply leak detecting spray to all intake system components.
If engine speed drops or Lambda probe voltage varies:
–  Press the button →.
–  Press buttons 0 and 6 for the function “End data transmission” and confirm the entry with the Q button.
–  Switch off the ignition.
–  Check whether the area sprayed has any leaks and eliminate any that that are detected.
If the engine speed and the Lambda probe voltage do not change:
–  Press the button →.
–  Press buttons 0 and 6 for the function “End data transmission” and confirm the entry with the Q button.
–  Switch off the ignition.
  
Read measurement values block 1        →
         1         2         3         4

Intake air preheating: check > < Test condition