wiring AUDI A4 1998 B5 / 1.G EVAP Workshop Manual
[x] Cancel search | Manufacturer: AUDI, Model Year: 1998, Model line: A4, Model: AUDI A4 1998 B5 / 1.GPages: 65, PDF Size: 0.77 MB
Page 27 of 65
20-152
If LED does not light up:
Electrical Wiring Diagrams, Troubleshooting & Component Locations
If wiring is OK:
Repair Manual, Fuel Injection & Ignition, Repair Group 24 - Check electrical wiring from terminal 3 via fuse for fuel pump relay for
open circuit. - Repair wiring as necessary.
- Check fuel pump relay:
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p://127.0.0.1:8080/audi/servlet/Dis
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pair&id=AUDI.B5.GE04.20.5
Page 28 of 65
20-153
Checking output wiring (vehicles with
mechanical throttle activator)
- Remove weatherstrip at plenum chamber -arrows-.
- Remove cover for plenum chamber -1- toward front.
- Remove cover for E-box in plenum chamber.
Note:
Disconnect or connect the Engine Control Module (ECM) connector only
with ignition switched off. - Carefully lever off clamp -arrow- with screwdriver.
- Unlatch clip and disconnect connector for Engine Control Module
(ECM).
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Page 29 of 65
20-154
- Connect test box VAG1598/22 to harness connector. Do not connect
ECM.
- Check the following wire connection for open circuit and short circuit to
Ground (GND) or to plus (B+): Electrical connector terminal
Test box VAG1598/22 socket
2 16
- Repair wiring or short circuit as necessary.
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Page 30 of 65
20-155
If you did not find any malfunction, however the
Leak Detection Pump (LDP) did not function
during the output Diagnostic Test Mode (DTM):
- Replace Leak Detection Pump (LDP) -V144
Page 20
-162
.
If the LED does not blink, although wiring is OK:
- Replace Engine Control Module (ECM):
Repair Manual, Fuel Injection & Ignition,
Repair Group 24
- Generate readiness code:
Repair Manual, Fuel Injection & Ignition,
Repair Group 24
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pair&id=AUDI.B5.GE04.20.5
Page 31 of 65
20-156
Checking output wiring (vehicles with
electronic throttle control)
- Connect voltage tester VAG1527B as follows:Electrical connector terminal
Specification
2 Battery Positive
- Initiate Diagnostic Test Mode (DTM) Page 20
-146
.
-
Press button until following display is shown:
Output Diagnostic Test Mode LDP leak test
Indicated on display:
If LED does not blink:
LED must blink
- Switch ignition off.
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Page 33 of 65
20-158
- Connect test box VAG1598/22 to harness connector. The ground
clamp (not visible in the illustration) must be connected to battery
ground connection. Do not connect ECM.
- Check the following wire connection for open circuit or short circuit to
Ground or plus (B+): Electrical connector terminal
Test box VAG1598/22 socket
2 25
- Repair wiring or short circuit if necessary.
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pair&id=AUDI.B5.GE04.20.5
Page 34 of 65
20-159
If you did not find any malfunction, however the
Leak Detection Pump (LDP) did not function
during the Output Diagnostic Test Mode (DTM):
- Replace LDP Page 20
-162
If the LED does not blink, although wiring is OK:
- Replace the Engine Control Module (ECM)
Repair Manual, Fuel Injection & Ignition,
Repair Group 24
- Generate readiness code:
Repair Manual, Fuel Injection & Ignition,
Repair Group 24
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e=re
pair&id=AUDI.B5.GE04.20.5
Page 35 of 65
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:
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pair&id=AUDI.B5.GE04.20.5
Page 36 of 65
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
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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