display AUDI A4 1998 B5 / 1.G ATW Engine Tank Ventilation Workshop Manual

24-108

Checking for proper seal
When there is no current, the Evaporative
Emission (EVAP) canister purge regulator valve -
N80- is closed.

- Disconnect hoses from EVAP valve; harness
connector remains connected.

- Attach assisting hose to one connection of
EVAP valve.

- Connect VAS5051 tester or VAG1551 scan tool
and select control module for engine electronics
using "address word" 01 Page 01
-10
. Ignition
must remain switched on.

- Initiate output DTM and activate Evaporative
Emission (EVAP) canister purge regulator valve
-N80- Page 01
-49
.
Output Diagnostic Test Mode (DTM) EVAP canister pur
ge re
gulator valve -N80-

Indicated on display(or, indicated: tank ventilation valve -N80-)
Valve must click......and must open and close (can be tested by blowing into assisting
hose).
Pa
ge 2 of 6 Tank ventilation, checkin
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