With Manufacturer's Scan Tool

Three Way Catalyst, checking





Special tools and equipment
^ VAG1551 Scan Tool

Note: VAG1552 Scan Tool can be used instead of the VAG1551; however, the VAG1552 has no printer.

^ VAG1 551/3B Adapter cable
^ VAG1788/1 0 RPM adjuster (only for Engine code AEG)

Test sequence
- Connect VAG 1551/1552) Scan Tool.

Refer to Powertrain Management

- Start engine and let idle.
- Press 0 and 1 buttons to select Address Word 01: "engine electronics". Press Q button to confirm input.
- Press (arrow) button.





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





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





Display will appear as shown (1 to 4 = Display zones)
Engine Code AEG
- Set engine speed with VAG1788/10 speed adjuster between 2800 and 3200 RPM.
- Maintain engine speed between 2800 and 3200 RPM until:
^ Value in display zone 4 changes from "Test OFF" to "Test ON".
^ The temperature value in display zone 2 must be 352.0 ° minimum.
- Continue maintaining engine speed between 2800 and 3200 RPM until:
^ Display zone 4 changes to "Cat. B1 OK".

Note: Catalyst diagnostic lasts about 100 seconds. If test does not complete after 150 seconds, adjust engine speed within range of 2800 to 3200 RPM.

- Remove VAG1788/10 engine speed adjuster from throttle pedal.
If "Cat. B1 not OK" appears in display zone 4:
- Check Diagnostic Trouble Code (DTC) memory:
Refer to Powertrain Management
- Display Readiness code:
- Readiness code must be reset if ECM is subject to low voltage with ignition ON or if DTC memory is erased.
Refer to Powertrain Management
If specification "Cat B1OK" is obtained:
- Press (arrow) button.





Display will appear as shown
- Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.

Engine Codes AVH, AZG

Note: The test can be performed while the accelerator and brake pedals are continually depressed.

- Start engine and let motor run at idle speed.





Indicated on display
- Press keys 0 and 4 for the function "Basic Setting" and confirm entry with Q key.





Indicated on display
- Press keys 0, 4 and 6 for the "Display group number 46" and confirm entry with Q key.





Indicated on display: (1 . . .4 = Display zones)
- Depress brake pedal and hold.
- Press accelerator pedal to wide-open position.

The engine speed is increased by the control module to approximately 2 300 RPM.
- Maintain engine speed at approximately 2280 RPM until catalyst temperature in display zone 2 increases to above 540°C.
If the diagnosis is initiated from the engine control module the display in display zone 4 jumps from "Test OFF" to "Test ON."
- Depress brake pedal and hold.
- Press accelerator pedal to wide-open position.
The engine speed is increased by the engine control module to approximately 2300 RPM.
- Maintain engine speed at approximately 2280 RPM until catalyst temperature in display zone 2 increases to above 540°C.
If the diagnosis is initiated from engine control module the display in display zone 4 jumps from "Test OFF" to "Test ON."
- Check specifications in display zone 4:
Display zone 4: Cat B1. OK, Cat B1 n. OK





Indicated on display: (1...4 = Display zones)
If the display indicates as described:
- Press C key.





Display will appear as shown
- Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
- Press Q button to confirm input

Note:
This process can take a few minutes.
If the display does not indicate as described:

- Press (arrow) key.
- Check Diagnostic Trouble Code (DTC) memory:
Refer to Powertrain Management
- Display Readiness code:
Refer to Powertrain Management
- Readiness code must be reset if ECM is subject to low voltage with ignition ON or if DTC memory is erased.
Refer to Powertrain Management