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Exhaust gas recirculation system > < Silencer with mountings

Leon Mk2

Checking catalytic converter
Checking catalytic converter
Engine codes ANV, AUC, ANW, AUD only
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-
Test conditions
   
l  Fuse No. 1 must be OK.
l  Vehicle stationary
l  All electrical consumers, e.g. lights and rear window heating must be switched off.
l  If the vehicle is equipped with an air conditioner, this must be switched off.
l  Exhaust system between catalytic converter and cylinder head must be free of leaks
l  Coolant temperature must be at least 80 °C, ⇒ display group 04, display zone 3.
l  Intake air temperature less than 60° C ⇒ display group 04, display zone 4
Functional check
–  Connect fault reader -V.A.G 1551- (-V.A.G 1552-). Start engine and select the engine control unit with the “Address word” 01. Connecting fault reader and selecting engine control unit: → Vehicle diagnosis, testing and information system VAS 5051
Lambda probe ageing diagnosis (cycle duration monitor)
  N24-0831
Indicated on display:
–  Press keys 0 and 4 for the “Introduce basic setting” function and confirm entry with Q key.
  
Rapid data transfer                 HELP
Select function XX
Indicated on display:
–  Press keys 0, 3 and 4 for “Display group number 34” and confirm entry with Q key.
  
Basic setting                           
Input display group number XXX
Indicated on display: (1...4 = Display zones)
–  Depress brake pedal.
Engine speed is raised to approx. 1100...1300 rpm by engine control unit.
–  Allow engine to run at increased engine speed until display zone 4 jumps from “Test OFF” to “Test ON”. The catalytic converter temperature in display zone 2 must be a minimum of 400 °C.
  Note!
This process can take a few minutes.
–  Check the amplitude quality in display zone 3: Specification: 0.7... 2.00
–  Allow engine to continue to run at increased engine speed until display zone 4 displays the specification “B1-P1 OK.”.
If the display does not indicate as described:
–  Interrogate fault memory: → Vehicle diagnosis, testing and information system VAS 5051
If the display indicates as described:
–  Press C key.
The engine speed drops to idling speed.
Catalytic converter diagnosis
  Note!
The diagnosis will only be terminated if the Lambda probe ageing diagnosis is first successfully completed.
  
System in basic setting       34       →

      

      

    
      

      

    
Indicated on display:
– 
          Press keys 0, 4 and 6 for “Display group number 46” and confirm entry with Q key.

      		 
      
    
Basic setting                           
Input display group number XXX          

      

      

    
      

      

    
Indicated on display: (1...4 = Display zones)
– 
          Depress brake pedal.
Engine speed is raised to approx. 1100...1300 rpm.
– 
          Allow engine to run at increased engine speed until display zone 4 jumps from “Test OFF” to “Test ON”. The catalytic converter temperature in display zone 2 must be a minimum of 400 °C.
– 
          Check the amplitude relationship in display zone 3: Specification: Max. 0.40
– 
          Allow the engine to continue to run at increased engine speed until display zone 4 displays “Cat B1 OK.”
If the display does not indicate as described:
– 
          Interrogate fault memory:  → Vehicle diagnosis, testing and information system VAS 5051
If the display indicates as described:
– 
          Press → key.
The engine speed drops to idling speed.
– 
          Press keys 0 and 6 for the “End output” function and confirm input with the Q key.
– 
          Switch off ignition.

      		 
      
    
System in basic setting       46       →

      

      

    


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