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Checking exhaust gas recirculation valve N18 > < Hose connection diagram for exhaust gas recirculation

A4 Mk1

Checking exhaust gas recirculation
Checking exhaust gas recirculation
Checking the exhaust gas recirculation function is performed in the “Basic setting” function. In this test, the exhaust gas recirculation valve is pulsed every 10 seconds, so that the extreme values for the exhaust gas recirculation (air mass meter) can be read off in display group 003.
Special tools and workshop equipment required
   
t  Vehicle diagnostic, testing and information system -VAS 5051B-
Procedure
l  Coolant temperature at least 80 °C.
l  Vehicle diagnostic, testing and information system -VAS 5051B- connected.
l  Ignition switched on.
l  Vehicle self-diagnosis and vehicle system “01 - Engine electronics” selected.
  W00-10343
Display on -VAS 5051B-:
–  From menu -1-, select diagnosis function “Basic setting” and press → key to continue.
  A01-10024
Display on -VAS 5051B-:
–  Press key 3 on keypad -1- to select “Display group 003” and confirm entry by pressing key Q.
  A01-10026
Display on -VAS 5051B-:
–  Check display in display zone -3-.
l  Specification: display should alternate between “EGR n.active” and “EGR active” every 10 seconds.
–  Check display in zone -3-.
l  Specification: display value for intake air mass “... mg/H” (= mg per stroke) should change significantly every 10 seconds.
If the specifications are not obtained:
–  Check exhaust gas recirculation valve -N18- → Chapter.
  A01-10027

Checking exhaust gas recirculation valve N18 > < Hose connection diagram for exhaust gas recirculation