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Lambda control > < Testing the engine operating conditions

Fabia Mk1

Testing the intake system for tightness (unmetered air)
Testing the intake system for tightness (unmetered air)
Special tools and workshop equipment required
t  Vehicle system tester -V.A.G 1552 -
t  Diagnostic cable -V.A.G 1551/3- or -V.A.G 1551/3A- or -V.A.G 1551/3B-
t  Engine leak search spray -G 001 800 A1-
Test condition
l  Coolant temperature minimum 80 °C
Test sequence
  Note
t  Because of the vacuum in the intake system the leak search spray is sucked in with the unmetered air. The leak search spray reduces the ignition performance of the mixture. This results in a drop in engine speed and a change in the lambda control value.
t  You must comply with the safety instructions on the box.
–  Connect vehicle system tester -V.A.G 1552-. Start engine and select the “address word 01” for engine electronics → Chapter.
–  Select function 08 “read measured value block” and display group number 001.
   
Readout on display:
–  Observe and take down the display values in display field 1 (engine speed) and display field 3 (lambda control before catalyst).
–  Systematically spray parts of the intake system with engine leak search spray.
If the engine speed drops or if the lambda control changes:
–  Check the sprayed part of the intake system for leakage and eliminate leak.
–  Select function 06 “End output” and confirm with Q.
  
Reading measured value block         1   ->
780/min    85.0 °C     -60 %    10111111

Lambda control > < Testing the engine operating conditions