With Manufacturer's Scan Tool

EVAP Canister Purge Regulator Valve (N80), Checking

The solenoid valve is closed when there is no current.

Special tools, equipment, test and inspection devices; required accessories







- V.A.G1551 scan tool


NOTE: The VAG 1552 scan tool may also be used in place of the V.A.G 1551 scan tool, except that no printout can then be made.







- V.A.G 1551/3 cable

Test conditions







- Fuse no. 43 must be OK
- The temperature of the coolant must be at least 85 °C See display group 04, field 3

Functional test
- Connect VAG 1551 (or VAG 1552) scan tool.
Leave engine running and select engine control module using "address word" 01.

Indicated on display:


Rapid Data Transfer HELP
Select Function XX


- Press keys "0" and "8" for function "Read Measuring Value Block" and acknowledge entry by pressing "Q."

Indicated on display:


Read Measuring Value Block
Enter Display Group No. XXX


- Press keys "0", "7" and "0" for display group 70 and acknowledge entry by pressing "Q."

Indicated on display (1-4 = display fields).


Read Measuring Value Block 70 ->
1 2 3 4


- Press "4" for function "basic setting." Diagnosis of evaporative emissions system is started.


NOTE: No load may be produced during this diagnosis. Otherwise the diagnosis will be stopped and can only be started again after applying the accelerator.


Indicated on display (1-4 = display fields).


System in basic setting 70 ->
1 2 3 4


- Let engine idle until specification "TEV OK" is displayed in field 4.

If the diagnosis is started by the engine control module, the display in field 4 will jump from "Test OFF" to "Test ON".


NOTE: If the display switches from "Test ON" to "Test OFF" during the test, the test can be repeated by a brief application of the accelerator.






If the indicator does not behave as described:
- Press -> button.
- Start output diagnostic test mode and trigger solenoid valve 1 for charcoal filter (N80):
- Check DTC memory:
- Read out readiness code:
- If fault memory has been erased or engine control module was separated from positive voltage supply, readiness code must be regenerated:

If the specification "TEV OK" is attained:
- Press -> button.
- Press keys "0" and "6" for function "end output" and acknowledge with "Q."
- Turn off ignition.