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Summary of components of exhaust gas recirculation system > < Aligning exhaust system free of stress

Octavia Mk1

Testing the catalyst
Testing the catalyst
Special tools and workshop equipment required
t  Vehicle system tester -V.A.G 1552 - with cable -V.A.G 1551/3-
Test conditions
l  Fuse 43 must be OK.
l  The exhaust system must be tight between the catalyst and the cylinder head
l  Coolant temperature at least 80 °C
l  All electrical components disconnected
l  If vehicle is equipped with air conditioning, this must be switched off.
  Note
This test should be successfully carried out only if the diagnosis of the lambda probe ageing has been carried out first of all → 1.4 ltr./55 kW Engine - Fuel Injection and Ignition System; Rep. Gr.24.
Test sequence
–  Connect vehicle system tester -V.A.G 1552-. Start engine and select address word 01 - Engine Electronics → 1.4 ltr./55 kW Engine - Fuel Injection and Ignition System; Rep. Gr.01.
–  Interrogate fault memory, if necessary eliminate fault and again erase fault memory → 1.4 ltr./55 kW Engine - Fuel Injection and Ignition System; Rep. Gr.01.
–  Select function 04 “Basic Setting” and then display group 046.
   
Readout on display:
–  Maintain speed between 2000...3000 rpm until display in display field 4 switches from “Test OFF” to “Test ON”. The catalytic converter temperature in display field 2 must be of at least 350 °C.
  Note
This may take a few minutes.
–  Further maintain speed between 2000...3000 rpm until the nominal result of the test appaears in display field 4.
Specified value: “Cat B1 O.K.”.
–  Check amplitude ratio in display field 3.
Specified value: max. 0.55.
–  Interrogate fault memory → 1.4 ltr./55 kW Engine - Fuel Injection and Ignition System; Rep. Gr.01.
–  Read out readiness code → 1.4 ltr./55 kW Engine - Fuel Injection and Ignition System; Rep. Gr.01.
–  If the fault memory was erased or if the permanent power supply of the engine control unit was interrupted the readiness code must be generated again → 1.4 ltr./55 kW Engine - Fuel Injection and Ignition System; Rep. Gr.01.
  Note
This test is foreseen for vehicles with a diagnosis of the vehicle voltage control unit and may indicate possible damage to the catalyst. If “Cat B1 N.O.K.” is displayed, the catalyst need not necessarily be replaced, it need only be replaced if the next exhaust emission test fails or if there is visible damage to the catalyst.
If the exhaust emission test fails or if the catalyst is damaged:
–  Replace catalyst.
–  If the nominal value “Cat B1 O.K.” is reached.
–  Select function 06 “End output” and switch off ignition → 1.4 ltr./55 kW Engine - Fuel Injection and Ignition System; Rep. Gr.01.
  
System in basic setting 46            ->
2070 rpm    352.0 °C     0.00     Test off

Summary of components of exhaust gas recirculation system > < Aligning exhaust system free of stress