Work sequence
WARNING: This page is about a different variant/trim than selected.
- Connect scan tool VAG 1551 (or system tester VAG 1552 ) scan tool. Leave engine running and select engine control unit using "address word" "01". Refer to 01 ON BOARD DIAGNOSTIC (OBD)
Diagnosing the aging of oxygen sensors (sensor dynamics)
Indicated on display
| Rapid Data Transfer HELP Select Function XX |
- Press keys "0" and "4" for function "start basic setting" and acknowledge entry with "Q."
Indicated on display
| Basic setting Enter Group Display No. XXX |
- Press "0" , "3" and "4" for display group 34 and acknowledge with "Q."
Indicated on display (1-4 = display fields)
| System in basic setting 34 -> 1 2 3 4 |
- Press brake pedal and hold.
NOTE:
- The engine control module will increase the engine speed.
- Check specifications in fields 1-4.
If diagnosis was started by engine control module, field 4 will jump from "Test OFF" to "Test ON."
| Display Fields | ||||
| 1 | 2 | 3 | 4 | |
| Display Group 34: Diagnosing aging of oxygen sensors - Bank 1 (Sensor Dynamics) | ||||
| Display | xxxx/min | xxx.x ° C | xx.xx | test OFF/test ON B1S1 OK/B1S1 nOK |
| Indicator | Engine speed (increments of 40) | Converter temperature | Sensor dynamics Bank 1 Oxygen sensor 1 | status of diagnosis and result |
| Working range | 0-6800 rpm | --- | 0.00-1.99 | --- |
| Specification | 1350-1450 rpm | --- | > 0.80 | B1S1 OK |
If the indicator does not behave as described:
- Press, → button.
- Check DTC memory: Refer to 01 ON BOARD DIAGNOSTIC (OBD)
- Read readiness code: Refer to 01 ON BOARD DIAGNOSTIC (OBD)
- If DTC memory has been erased or engine control module was separated from positive voltage supply, readiness code must be regenerated: Refer to 01 ON BOARD DIAGNOSTIC (OBD)
If the indictor behaved as described:
- Release brake pedal.
- Press C button.
Diagnosis of catalytic converter
NOTE:
- This diagnosis will only exit if the diagnosis of the oxygen sensor aging has already been completed successfully.
Indicated on display
| Basic setting Enter Display Group No. XXX |
- Press "0" , "4" and "6" for display group 46 and acknowledge with "Q."
Indicated on display (1-4 = display fields)
| System in basic setting 46 -> 1 2 3 4 |
- Press brake pedal and hold.
NOTE:
- The engine control module will increase the engine speed.
- Check catalytic converter conversion (amplitude ratio) in field 3:
Specification: 0.50 maximum
- Let engine run at higher speed until "Cat B1 OK" is displayed in field 4.
If diagnosis is started by engine control module, field 4 will jump from "Test OFF" to "Test ON."
NOTE:
- Diagnosis of the catalytic converter lasts about 100 seconds.
| Display Fields | ||||
| 1 | 2 | 3 | 4 | |
| Display Group 46: Diagnosing Catalytic Converter Bank 1 | ||||
| Display | xxxx rpm | xxx.x ° C | x.xx | Test OFF/Test ON Cat B1 OK Cat B1 nOK |
| Indicator | Engine speed (increments of 40) | Converter temperature | Catalytic Conversion (Amplitude ratio) | status of diagnosis and result |
| Working Range | 0-6800 rpm | --- | 0.00-1.00 | --- |
| Specification | 1350-1450 rpm | 400-650.0 ° C | 0.50 max. | Cat B1 OK |
If the indicator does not behave as described:
- Press, → button.
- Check DTC memory: Refer to 01 ON BOARD DIAGNOSTIC (OBD)
If the indicator behaves as described:
- Release brake pedal.
If "Cat B1 nOK" is displayed in field 4:
- Check DTC memory: Refer to 01 ON BOARD DIAGNOSTIC (OBD)
- Read readiness code: Refer to 01 ON BOARD DIAGNOSTIC (OBD)
- If DTC memory was erased or engine control module was separated from positive voltage supply, readiness code must be regenerated: Refer to 01 ON BOARD DIAGNOSTIC (OBD)
If the specification "Cat B1 OK" is attained:
- Press, → button.
- Press "0" and "6" for function "end output" and acknowledge by entering "Q."
- Turn off ignition.