With Manufacturer's Scan Tool

Three Way Catalytic Converter (TWC), checking
Special tools and equipment
^ VAG1551 scan tool (or VAG1552 mobile scan tool) with VAG1551/3 cable





^ VAG 1788/10 RPM adjuster

Test sequence
- Connect VAG 1551 scan tool (VAG1552). Start engine and select the Engine Control Module (ECM) using address word 01. Connecting scan tool and selecting Engine Control Module (ECM):





Indicated on display:
- Press buttons -0- and -4- to select "Basic Setting" function 04. Press -Q- button to confirm input.





Indicated on display:
- Use VAG1788/10 RPM adjuster to adjust engine RPM to between 2300 and 2500 RPM:
- Press buttons -0-, -3- and -4- to select "Display group number 34". Press -Q- button to confirm input.





Indicated on display: (1 to 4 = display fields)
- Maintain engine speed until indication in display field 4 jumps from "Test OFF" to "Test ON". The catalytic converter temperature in display field 2 must be at least 350°C.
- Continue to maintain engine speed until display field 4 indicates specified value "B1-S1 OK".
- Press -C- button.
- Press buttons -0-, -4- and -6- to select "Display group number 46". Press -Q- button to confirm input.





Indicated on display: (1 to 4 = display fields)
- Maintain engine speed until indication in display field 4 jumps from "Test OFF" to "Test ON".
The catalytic converter temperature in display field 2 must be at least 430°C for engines AUG; and at least 550°C for engine AWM.

Engine code AUG
- Check amplitude ratio in display field 3:
Specification: max: 0.4

Engine code AWM
- Check diagnostic value in display field 3:
Specification: MIN: 1.0

Continuation for all
- Continue to maintain engine speed until display field 4 indicates specified value "Cat B1 OK".
If display field 4 indicates "Cat B1 not OK":
- Check DTC memory:
If specified value "Cat B1 OK" is obtained:
- Press (arrow) button.





Indicated on display:
- Press buttons -0- and -6- to select "End data transfer" function 06. Press -Q- button to confirm input.