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Test voltage supply of engine control unit > < Test air mass meter G70

Octavia 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 - with cable -V.A.G 1551/3-
Testing with engine leak search spray -G 001 800 A1-
  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 considerable increase of the CO content.
t  You must comply with the safety instructions on the box.
–  Select 08 for the function “read measured value block” and further select display group 001.
   
The following appears in the display:
–  Note engine speed in display field 1.
–  Note lambda probe voltage in display field 3 and the range in which it fluctuates.
–  Systematically spray parts of the intake system with engine leak search spray.
If the engine speed or lambda probe voltage does not change:
–  Press → key.
–  Enter 06 for the function “End output” and confirm with key Q.
If the engine speed drops or if the lambda probe voltage changes:
–  Press → key.
–  Enter 06 for the function “End output” and confirm with key Q.
–  Check the sprayed location of the intake system for leaks and if necessary eliminate the fault.
  
Reading measured value block 1                      ->
850/rpm    90°C     0.05V    0000010

Test voltage supply of engine control unit > < Test air mass meter G70