Test sequence
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- Connect Scan Tool VAG 1551 or Vehicle system tester VAG1552/. Start engine and select "Address word" 01 of engine control module. → 01 ON BOARD DIAGNOSTIC (OBD)
Indicated on display
| Rapid data transfer HELP Select function XX |
- Press keys 0 and "4" for function "Initiate basic setting" and confirm entry with "Q" key.
Indicated on display
| Basic setting Input display group number XXX |
- Press keys "0" , "0" and "1" for "Display group number 1" and confirm entry with "Q" key.
Indicated on display (1...4 = display zones)
| System in basic setting 1 -> 1 2 3 4 |
Only continue with the test when
- The coolant temperature is above 85 ° C - Display zone 2 -
- Change to display group 70 as follows:
- Press C key.
Indicated on display
| Basic setting Input display group number XXX |
- Press keys "0" , "7" and "0" for "Display group number 70" and confirm entry with "Q" key.
NOTE:
- The engine must not be loaded during this diagnosis, if this occurs the diagnosis will be interrupted and will not start again until the engine is revved-up.
Indicated on display (1...4 = display zones)
| System in basic setting 70 -> 1 2 3 4 |
If the diagnosis is initiated by the engine control module the display in display zone 4 jumps from "Test OFF" to "Test ON".
NOTE:
- This process can take approx. 30 seconds.
- Leave engine running at idling speed until display zone 4 displays specification TBV OK.
NOTE:
- TBV stands for tank breather valve ( EVAP canister purge regulator valve N80 ).
If "TBV OK" appears in display zone 4:
- Press → key.
- Press keys "0" and "6" for function "End output" and confirm entry with "Q" key.
- Switch ignition off.
If "TBV n. OK" appears in display zone 4:
- Press → key.
- Check DTC memory: → 01 ON BOARD DIAGNOSTIC (OBD)
- Read readiness code: → 01 ON BOARD DIAGNOSTIC (OBD)
- Generate readiness code again if DTC memory has been erased or engine control module separated from permanent positive supply. → 01 ON BOARD DIAGNOSTIC (OBD)
If no DTC is stored in DTC memory:
- Press keys "0" and "6" for function "End output" and confirm entry with "Q" key.
- Switch ignition off.
- Check breather lines to EVAP canister (may be kinked).
- Check EVAP system for leaks → EVAP system, checking for leaks .