2000 AUDI A4 fuel

20-160

Checking input wiring (vehicles with
mechanical throttle activator)

- Switch ignition off.

- Connect test box VAG1598/22 to harness connector Page 20
-153
,
"Checking output wiring."

Repair Manual, Fuel Injection & Ignition, Repair Group 24 - Check the following wire connections for open circuit or short circuit to
Ground or plus (B+): Electrical connector terminal
Test box VAG1598/22 socket
2 37
- Repair open or short circuit as necessary.
- Generate readiness code:
Pa
ge 35 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

20-161

Checking input wiring (vehicles with
electronic throttle control)

- Switch ignition off.

- Connect test box VAG1598/31 to harness connector Page 20
-156
,
"Check output wiring."

Repair Manual, Fuel Injection & Ignition, Repair Group 24 - Check the following wire connections for open circuit or short circuit to
Ground or plus (B+): Electrical connector terminal
Test box VAG1598/31 socket
1 80
- Repair open or short circuit as necessary.
- Generate readiness code:
Pa
ge 36 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

20-163

Installing
Installation is in reverse order of removal, but do
the following:

Note:
Secure all hoses with clamps that are the same
as factory installed.

CAUTION!

Always refer to the latest parts catalog to
ensure that you use original equipment fuel
hose clamps.

Tightening torque: - Secure hose -2- with tie wrap -1- to bracket of LDP.Component
Nm
Bracket for Leak Detection Pump (LDP) 7.5
Pa
ge 38 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

20-164

EVAP canister, removing and installing


Note:
To check seal integrity, perform tank leak
diagnosis Page 20
-139
.

Removing

- Remove cover for EVAP canister at bottom of
spare tire well.

Installing
Installation is performed in the reverse order of the removal procedure,
during installation note the following:
CAUTION!
Always refer to the latest parts catalog to ensure that you use
original equipment fuel hose clamps. - Loosen hose connections -1- and - 3- on bleed lines.
- Remove sealing pieces out and over the bleed lines.
- Loosen studs -arrows-.
Pa
ge 39 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

If vehicle fails above test ("System not OK"):

- Verify fuel cap is properly closed; repeat test.
Pa
ge 42 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

20-167
If "System OK" after re-test:

- Erase DTC memory (if necessary).

- Repeat test several times to ensure proper
EVAP system operation (remove and re-install
fuel cap before each test).

- Perform quality check and return vehicle to
customer.

Note:
If the vehicle passes the above EVAP system
test, DTCs may be sporadic; the entire EVAP
system should be carefully inspected.
If VAS 5051 continues to indicate "System not
OK" after re-test, proceed to next step.

Perform EVAP tester self-test

Note:

Always perform system self-test of KLI9210
EVAP Tester prior to use to ensure that there
are no leaks.
Refer to KLI9210 instruction manual for specific
instructions.
Pa
ge 43 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

20-169

Note:
If the leak cannot be located or repaired, contact
K-Line Customer Service - Technical Support.

Calibrate KLI9210 Tester
Determine vehicle leak threshold:

To m.y. 2000: leak threshold 0.040 in.

From m.y. 2001: leak threshold 0.020 in.

Test fuel cap - Attach test hose to appropriate preset port (black arrows).
- Turn control valve from "Hold" to "Test".
- Set flow meter flag (white arrow) at indicated value on flow meter.
- Turn control valve to "Hold"; remove test hose.
- Connect fuel cap tester to hose.

If no flow is indicated: - Screw fuel cap tightly to cap receiver (arrow).
- Turn control valve to "Test".
- Read flow meter on tester.
Pa
ge 46 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

20-170
If flow is indicated:

- Replace fuel cap and re-test.
If new fuel cap shows no flow:

- Repeat Leak Test, with new fuel cap installed,
using VAS 5051 and Basic Settings mode,
Page 20
-139
.
If Leak Test shows 'System OK":

- Perform quality check and return vehicle to
customer.

Test LDP -V144- for internal leaks
If vehicle is not LDP-equipped, proceed to "Test
EVAP system".

- Clamp off LDP outlet (EVAP side) using Special
Tool No. 3094 or equivalent.

CAUTION!

Clamp only soft rubber lines when isolating a
leak. To avoid risk of damage, never clamp
hard plastic lines!

-
Repeat Leak Test using VAS 5051 and Basic
Pa
ge 48 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