With Manufacturer's Scan Tool

Catalytic converter, checking

Special tools and equipment





^ V.A.G 1551 Scan Tool (or vehicle system tester V.A.G 1552) with cable VAG1551/3

Note: All functions which could previously be performed with V.A.G 1551/1552 can also be performed with the new tester VAS 5051.





Conditions
^ Fuses must be OK.
^ Battery voltage must be at least 11.5 V.
^ If vehicle is equipped with air conditioning, this must be switched off.
^ Selector lever must be in position "P" or "N" on models with an automatic transmission.
^ Exhaust system between catalytic converter and cylinder head must be free of leaks
^ Coolant temperature must be at least 85°CDisplay group 1, display zone 2
^ Catalytic converter temperature must be at least 380° Display group 46, display zone 2
^ No DTC's may be stored in DTC memory
Refer to Powertrain Management
^ Oxygen sensor aging before catalytic converter is OK,
^ Oxygen sensor aging after catalytic converter is OK,

Note: The diagnosis will only be ended if the oxygen sensor aging diagnosis before and after catalytic converter is completed successfully first.

Test sequence
- Connect V.A.G 1551 (or V.A.G 1552). Start engine and select "Address word" 01 of engine control module.
Refer to Powertrain Management





Indicated on display
- Press keys 0 and 4 for function "Initiate basic setting" and confirm entry with Q key.





Indicated on display
- Press keys 0, 0 and 1 for"Display group number 1" and confirm entry with Q key.





Indicated on display: (1 . . .4 = display zones)
Only continue with the test when:
^ Coolant temperature is above 85°C -Display zone 2
- Change to display group 46 as follows:
- Press C key.





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





Indicated on display: (1 . . .4 = display zones)
- Depress brake pedal and hold.
- Depress accelerator down to wide open throttle position.
Engine speed will be increased by engine control module to approximately 2300 rpm.

Only continue with the test when:
^ Catalytic converter temperature is above 380°C -Display zone 2

- Hold brake pedal and accelerator down until display in display zone 4 jumps from "Test OFF" to "Test ON".

Note: This process can take approximately 80 seconds.

- Continue to hold brake pedal and accelerator down until display zone 4 displays specification "Cat. B1 OK.".
- Release brake and accelerator pedals.
"Cat B1 OK." appears in display zone 4
- Press (arrow) key.
- Press keys 0 and 6 for function "End output" and confirm entry with Q key.
- Switch ignition off.
"CatB1 n.OK." appears in display zone 4
- Press (arrow) key.
- Check DTC memory:
Refer to Powertrain Management
- Read readiness code:
- Generate readiness code again if DTC memory has been erased or engine control module disconnected from permanent positive supply:
Refer to Powertrain Management
- If no DTC is stored in DTC memory
- Press keys O and 6 for function "End output" and confirm entry with Q key.
- Switch ignition off.
- Replace front exhaust pipe with catalytic converter.