wheel AUDI A4 1998 B5 / 1.G EVAP Workshop Manual

20-131


7 -
Vacuum hose
LDP / throttle actuator control module
Connection in engine compartment4 cylinder engine Fig. 16 cylinder engine Fig. 2
8 -
Cable tie
To mounting of vacuum line on LDP
bracket
9 -
Leak Detection Pump (LDP) -V144 Location: in left rear wheel house behind
wheel well Checking Page 20
-139
Removing and installing Page 20
-162
10 -
3-pin harness connector
Black
Pa
ge 2 of 65 EVAP s
ystem, servicin
g
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE04.20.5

20-132


11 -
Connecting hose
LDP / EVAP canisterPressure sideTo remove at LDP, press unlocking tab on
connector
12 -
10 Nm
13 -
Air filter For LDP
14 -
Sealing piece
15 -
Cable tie For mounting connecting hose on wheel
house
16 -
EVAP canister Location: lower front in spare wheel wellRemoving and installing Page 20
-164
Pa
ge 3 of 65 EVAP s
ystem, servicin
g
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE04.20.5

20-137

Note:
Observe the cover flange installation instructions.

Front wheel drive Page 20
-44


All wheel drive Page 20
-97
.

- Visually inspect all fuel tank system line and
hose connections and replace any leaking lines,
for example:


Line from EVAP canister to EVAP canister
purge regulator valve in engine
compartment.

Lines from EVAP canister to the LDP (under
left wheel house liner).

Line from the fuel tank to the EVAP canister
(under the cover for the EVAP canister).

Lines of the tank ventilation system (under
right wheel house liner).

Fuel lines to the engine.

Note:
Pa
ge 9 of 65 EVAP s
ystem, servicin
g
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE04.20.5

20-147

Rapid data transfer
HELP
Enter address word XX

Indicated on display:
- Enter "01" for address word "Engine electronics" and confirm input by
pressing Q button.
-
Press button.
Rapid data transfer
HELP
Select function XX

Indicated on display:
- Enter "03" for function "Output Diagnostic Test Mode (DTM)."
Rapid data transfer
Q
03-Output Diagnostic Test Mode

Indicated on display:
- Confirm input by pressing Q-button.
Output Diagnostic Test Mode EVAP Purge Regulator Valve
-N80

Indicated on display (EVAP canister purge regulator valve -N80)
-
Press button until following display is shown:
Output Diagnostic Test Mode Leak Detection Pump

Indicated on display:
Note:
You can hear the leak detection pump run at the left rear wheel housing
when it is working. This will be difficult to hear. Make sure to be as close
to LDP as possible and to eliminate as much surrounding noise as
possible. The leak detection pump is activated for about 1 minute.
Pa
ge 22 of 65 EVAP s
ystem, servicin
g
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE04.20.5

20-162

Leak Detection Pump (LDP) -V144,
removing and installing

Checking LDP Page 20
-139


Removing

- Remove left rear wheel.

- Remove left rear wheel housing liner.

Repair Manual, Body Exterior, Repair Group
66


- Cut tie wrap -1- and remove hose -2- .
- Disconnect hose coupling -3- after pressing tab.
- Remove nuts -arrows-.
- Switch off ignition.
- Remove LDP, unclip and disconnect connector.
Pa
ge 37 of 65 EVAP s
ystem, servicin
g
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE04.20.5

20-165

Tightening torques

Component
Nm
EVAP canister to body 15
Cover on spare wheel well 10
Pa
ge 40 of 65 EVAP s
ystem, servicin
g
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE04.20.5

20-176


EVAP system leak detection circuit,
schematic diagram (vehicles with 1.8 ltr.
turbo engine)

Repair Manual, 1.8 Liter 4-Cyl. 5V Turbo Fuel
Injection & Ignition, Repair Group 24 1 -
Check valve
Location (light/dark side): as shown in
illustration
2 -
EVAP canister purge regulator valve -N80-Location: in engine compartmentChecking
3 -
Bleed line
From EVAP canister purge regulator valve
-N80-
LocationRight side under floor panFront-wheel drive: on floor pan in area of
fuel tank All-wheel drive: on fuel tank in area of fuel
tank
Pa
ge 56 of 65 EVAP s
ystem, servicin
g
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE04.20.5

20-177


4 -
Bleed line
From gravity valve
5 -
EVAP canister Location: bottom of spare wheel well
6 -
Connecting hose LDP/EVAP canisterPressure side
7 -
Air filter For LDP
8 -
LDP -V144- Location: left rear wheel house behind
wheel well Page 20
-130

9 -
Vacuum hose
LDP / Throttle actuator control module
Pa
ge 57 of 65 EVAP s
ystem, servicin
g
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE04.20.5

20-180


EVAP system leak detection circuit,
schematic diagram (vehicles with 2.8 ltr.
engine)

Repair Manual, 2.8 Liter V6 5V Fuel Injection &
Ignition, Repair Group 24 1 -
Throttle actuator control module -J338-
2 -
EVAP canister purge regulator valve -N80-Location: in engine compartmentChecking:
3 -
Bleed line
From EVAP canister to EVAP canister
purge regulator valve -N80-
LocationOn right side under floor panVehicles with front-wheel drive: mounted
on floor pan in area of fuel tank Vehicles with all-wheel drive: mounted on
fuel tank
Pa
ge 60 of 65 EVAP s
ystem, servicin
g
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE04.20.5

20-181


4 -
Bleed line
To gravity valve on fuel tank
5 -
EVAP canister Location: in bottom of spare tire well
6 -
Connecting hose LDP / EVAP canisterPressure side
7 -
Air filter For LDP
8 -
LDP -V144 Location: in left rear wheel house behind
wheel well Page 20
-130

9 -
Vacuum hose
LDP / throttle actuator control module
10 -
T - piece Location Fig. 1
Pa
ge 61 of 65 EVAP s
ystem, servicin
g
11/18/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE04.20.5