With Manufacturer's Scan Tool

Three Way Catalyst, checking

Special Tools

Special Tools:

^ VAG 1551 Scan Tool

Note: VAG 1552 Scan Tool can be used instead of the VAG 7551,- however, the VAG 1552 has no printer

^ VAG 1551/3 Adapter cable
^ VAG 1788/10 RPM adjuster

Test sequence
- Connect VAG 1551/1552) Scan Tool.
- Start engine and let idle
- Press 0 and 1 buttons to select Address Word 01: "engine electronics"





Display will appear as shown
- Press 0 and 4 buttons to select Function 04: "Basic setting"
- Press Q button to enter input





Display will appear as shown
- Press 0, 4 and 6 buttons to select "Display group 46"
- Press Q button to enter input





Display will appear as shown (1 to 4 = Display zones)
- Set engine speed with VAG 1788/10 speed adjuster between 2800 and 3200 rpm.
- Maintain engine speed between 2800 and 3200 rpm.
^ Value in display zone 4 changes from "Test OFF" to "Test ON".
^ Value in display zone 2 minimum 352.0C.
- Continue maintaining engine speed between 2800 and 3200 rpm
Display zone 4 changes to "Cat. B1 OK".





Note: Catalyst diagnostic lasts about 100 seconds. If test does not complete after 750 seconds, adjust engine speed within range of 2800 to 3200 rpm.

- Remove VAG 1788/10 engine speed adjuster from throttle pedal.
If "Cat. BI not OK" appears in display zone 4:
- Check Diagnostic Trouble Code (DTC) memory.
- Display Readiness code.
- Readiness code must be reset if FCM is subject to low voltage with ignition ON or if fault memory is erased.
If specification "Cat 131 OK" obtained:
- Press --> button.





Display will appear as shown
- Press 0 and 6 buttons to select Function 06: " End transfer"
- Press Q button to enter input