With Manufacturer's Scan Tool

EVAP Canister Purge Regulator Valve -N80-, Checking

In a no-current situation the solenoid valve is closed.

Checking activation, output diagnostic test mode

Special tools and equipment





- VAG1551 scan tool


NOTE: The VAG1552 vehicle system tester can be used instead of the VAG1551 Scan Tool, however a print-out is not possible.






- VAG 1551/3 Cable

Test conditions





- Fuse No. 43 must be OK
- Coolant temperature must be at least 85 °C See display group 04, display zone 3

Functional check
- Connect VAG1551 Scan Tool (VAG1552). Start engine and select the engine control module with the "Address word" 01.

Connecting scan tool and selecting engine control module:

Indicated on display


Rapid data transfer HELP
Select function XX

- Press keys 0 and 8 for the "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: (1-4 = Display zones)

Read Measuring 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: (1-4 = 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 the specification "EVAP OK" is displayed in display zone 4.

NOTE: If the display jumps from "Test ON" to "Test OFF" during the test, rev up briefly and the test will be repeated.






If "EVAP not OK" appears in display zone 4:
- Initiate output diagnostic test mode and activate the EVAP canister purge regulator valve -N80:
- Check DTC memory.
- Read out readiness code.
- If the DTC memory has been erased or the engine control module separated from the permanent positive, the readiness code must be generated again.

If the specification "EVAP OK" is obtained:
- Press -> key.
- Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
- Switch ignition off.