With Manufacturer's Scan Tool

Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-, Checking

In a no-current situation the valve is closed.

Special tools and equipment







- V.A.G 1551 Scan Tool

NOTE: The vehicle system tester V.A.G 1552 can be used instead of the VAG 1551 Scan Tool, however a print-out is not possible.







- V.A.G 1551/3 Cable

Test conditions
- Coolant temperature must be at least 80 degrees C, see display group 04, display zone 3.







- Fuse No. 43 must be OK.

Functional check
- Connect VAG 1551 scan tool (V.A.G 1552). Start engine and select engine control module with "Address word" 01.

Indicated on display

Rapid data transfer HELP
Select function XX

- Press keys 0 and 8 for "Read measured value block" function and confirm entry with Q key.

Indicated on display

Read measured value block
Input display group number XXX

- Press keys 0, 7 and 0 for "Display group number 70" and confirm entry with Q key.

Indicated on display: (1 to 4 = Display zones)

Read measured value block 70 ->
1 2 3 4

- Press key 4 for the "Basic setting" function ("Tank venting valve diagnosis" will be initiated)

NOTE: The engine must not be loaded during this diagnosis because the diagnosis will be interrupted and will not be started again until the engine is revved-up.

Indicated on display: (1 to 4 = Display zones)

System in basic setting 70 ->
1 2 3 4

When the diagnosis is initiated by the engine control module, the display in display zone 4 jumps from "Test OFF" to "Test ON"

- Run engine at idling speed until specification "TBV OK" is displayed in display zone 4.

NOTE: TBV stands for tank breather valve (Evaporative Emission (EVAP) canister purge regulator valve).

If "TBV not OK" appears in display zone 4:
- Initiate Output Diagnostic Test Mode and activate Evaporative Emission (EVAP) canister purge regulator valve -N80-.
- Check DTC memory.
- Read readiness code.
- Generate readiness code again if DTC memory has been erased or engine control module separated from permanent positive.

If the specification "TBV OK" is obtained:
- Press -> key.

Indicated on display

Rapid data transfer HELP
Select function XX

- Press keys 0 and 6 for function "End output" and confirm entry with Q key.
- Switch ignition off.