Catalytic Converter: Testing and Inspection

Three Way Catalytic Converter
Three way catalytic converter, checking
Special tools, testers, measuring instruments and auxiliary items required
^ VAG 1551 scan tool or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3





^ V.A.G 1788/10 Engine speed adjuster (only engine codes AWD, AWW)

Test sequence
^ Connect VAG 1551 scan tool ((V.A.G 1552). Start engine and select engine control module with "Address word" 01. Connecting scan tool and selecting engine control module.





Indicated on display:
^ Press keys O and 4 for the function "Introduction of basic setting" and confirm entry with Q key.





Indicated on display:
^ Press keys 0, 3 and 4 for "Display group number 34" and confirm entry with Q key.





Indicated on display: (1 to 4 = Display zones)

Engine codes AWD, AWW
^ Set engine speed to 1800 to 2200 RPM using speed regulator V.A.G 1788/10:
^ Maintain the engine speed at 1800 to 2200 rpm until the display in display zone 4 jumps from "Test OFF" to "Test ON". The Three way catalytic converter temperature in display zone 2 must be between 350 and 500°C.
^ Continue to maintain the speed at 1800 to 2200 rpm until the specification "B1-S1 OK" appears in display zone 4.

Engine code AWP
^ Depress brake pedal and hold.
^ Press accelerator pedal to wide-open position.
The engine speed is increased by the control module to approx. 2300 RPM.
^ Hold both brake pedal and accelerator pedal depressed until the display in display zone 4 jumps from "Test OFF" to "Test ON".
The three way catalytic converter temperature in display zone 2 must be between 350 to 500°C.
^ Continue to hold both brake pedal and accelerator pedal depressed until the result of the function test is displayed in display zone 4 Specification:"B1-S1 OK"
^ Release gas pedal and brake pedal
Continuation for all engine codes
If the display does not indicate as described:
^ Check DTC memory.
^ Read out readiness code.
^ If the DTC memory has been erased or the engine control module separated from the permanent positive, the readiness code must be generated again.

If the display indicates as described:
^ Press C key.
^ Press keys 0, 4 and 6 for "Display group number 46" and confirm entry with Q key.





Indicated on display: (1 to 4 = Display zones)

Engine codes AWD, AWW
^ Maintain engine speed at 1800 to 2200 rpm until display in display zone 4 jumps from "Test OFF" to "Test ON". Three way catalytic converter temperature in display zone 2 must be at least 440°C.
^ Continue to maintain engine speed at 1800 to 2200 rpm until Specification "Cat B1 OK" appears in display zone 4.
^ Remove the engine speed adjuster V.A.G 1788/10 from accelerator pedal.

Engine code AWP
^ Depress brake pedal and hold.
^ Press accelerator pedal to wide-open position.
The engine speed is increased by the control module to approx. 2300 RPM.

^ Hold both brake pedal and accelerator pedal depressed until the display in display zone 4 jumps from "Test OFF" to "Test ON".
The three way catalytic converter temperature in display zone 2 must be at least 440°C.

^ Continue to hold both brake pedal and accelerator pedal depressed until the result of the function test is displayed in display zone 4. Specification: "Cat. B1 OK"
^ Release brake pedal and gas pedal.

Continuation for all engine codes
If "Cat. B1 not OK" appears in display zone 4:
^ Check DTC memory.
^ Read out readiness code.
^ If the DTC memory has been erased or the engine control module separated from the permanent positive, the readiness code must be generated again.

If the specification "Cat B1 OK" is obtained:
^ Press (arrow) key.





Indicated on display:
^ Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
^ Switch off ignition.