AUDI A4 1999 B5 / 1.G AFC Engine On Board Diagnostic Multiport Fuel Injection Workshop Manual

The malfunction "17914" is set as soon as the throttle opening is greater than 7 and the idle switch is closed for longer
than 3 sec.
Pa
ge 181 of 366 On Board Dia
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(OBD
) - Multi
port Fuel In
jection
(MFI
)
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p://127.0.0.1:8080/audi/servlet/Dis
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yp
e=re
pair&id=AUDI.B5.FU01.01.1

01-134

Output on GST and/or
on VAG 1551 scan tool
Possible malfunction cause

Malfunction repair
P1509 / 17917
IAC Circ.
Electrical Malfunction Harness connector on Idle Air Control
(IAC) valve -N71- loose or corroded due to
moisture in the harness connector

- Check harness connector for tight fit and
contact corrosion, if necessary reconnect
and/or clean, installation location page 24
-
1

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after test
drive, check DTC memory again
MIL Status:
MIL lights up
immediately
Wiring connection to Idle Air Control
(IAC) valve -N71- faulty or valve -N71-
faulty

- Check Idle Air Control (IAC) valve -N71-
page 24
-37


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after test
drive, check DTC memory again
For troubleshooting
Display group 018
Engine Control Module (ECM) -J192-
faulty

- Replace and code engine control module
page 01
-265
erase DTC memory and test
drive check DTC memory
Note:
If a malfunction is recognized in the electrical circuit, both power output stages ("+" and "-" output) are switched off. The Idle
Air Control (IAC) -N71- has no power and opens the limp home cross section.
Pa
ge 182 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1

01-135

Output on GST and/or
on VAG 1551 scan tool
Possible malfunction cause

Malfunction repair
P1510 / 17918
IAC Circ.
Short to B+ Harness connector for Idle Air Control
(IAC) valve -N71- loose or corroded due to
moisture in the harness connector

- Check harness connector for tight fit and
contact corrosion, if necessary reconnect
and/or clean, installation location page 24
-
1

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after
test drive, check DTC memory again
MIL Status:
MIL lights up
immediately
Wiring connection to Idle Air Control
(IAC) valve -N71- faulty or valve -N71-
faulty

- Check Idle Air Control (IAC) valve -N71-
page 24
-37


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after
test drive, check DTC memory again
For troubleshooting
Display group 018
Engine Control Module (ECM) -J192-
faulty

- Replace and code engine control module
page 01
-265
erase DTC memory and test
drive check DTC memory
Note:
If a malfunction is recognized in the electrical circuit, both power output stages ("+" and "-" output) are switched off. The idle
stabilizer valve -N71- has no power and opens the limp home cross section.
Pa
ge 183 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1

01-136

Output on GST
and/or on VAG 1551
scan tool Possible malfunction cause

Malfunction repair
P1511 / 17919
Intake Manifold
Changeover Valve
Circ.
Electrical Malfunction Harness connector on Intake manifold
change-over valve -N156- loose or corroded
due to moisture in the harness connector


- Check harness connector for tight fit and
contact corrosion, if necessary reconnect
and/or clean, installation location page 24
-
1

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after
test drive, check DTC memory again
MIL Status:
Malfunction not
displayed by MIL Wiring connection to Intake manifold
change-over valve -N156- faulty or valve -
N156- faulty

- Check Intake manifold change-over valve -
N156- page 24
-64


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after
test drive, check DTC memory again

Engine Control Module (ECM) -J192-
faulty

- Replace and code engine control module
page 01
-265
erase DTC memory and test
drive check DTC memory
Pa
ge 184 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1

01-137

Output on GST
and/or on VAG 1551
scan tool Possible malfunction cause

Malfunction repair
P1512 / 17920
Intake Manifold
Changeover Valve
Circ.
Short to B+ Harness connector on valve for Intake
manifold change-over valve -N156- loose or
corroded due to moisture in the harness
connector

- Check harness connector for tight fit and
contact corrosion, if necessary reconnect
and/or clean, installation location page 24
-1

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after
test drive, check DTC memory again
MIL Status:
Malfunction not
displayed by the MIL Wiring connection to Intake manifold
change-over valve -N156- faulty or valve -
N156- faulty

- Check Intake manifold change-over valve -
N156- page 24
-64


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after
test drive, check DTC memory again

Engine Control Module (ECM) -J192- faulty

- Replace and code engine control module
page 01
-265
erase DTC memory and
test drive check DTC memory
Pa
ge 185 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1

01-138

Output on GST and/or on
VAG 1551 scan tool Possible malfunction cause

Malfunction repair
P1600 / 18008
Power Supply (B+)
Terminal 15
Low Voltage Battery discharged or faulty

Repair Manual, Electrical
Equipment, Repair Group 27
- Check and charge battery

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and
after test drive, check DTC memory
again
MIL Status:
Malfunction not displayed
by MIL Bad ground connection to Engine Control
Module (ECM) -J192-

- Check voltage supply to the Engine
Control Module (ECM) -J192-
page 28
-27


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and
after test drive, check DTC memory
again

Excessive current draw with ignition off (e.g.
because of luggage compartment light on
continuously, etc.)

- Carry out holding current test. The
holding current must be greater than
50 mA
For troubleshooting
Display group 001
Malfunction cause found: Yes
No

- Erase DTC memory, test drive and
after test drive, check DTC memory
again
Pa
ge 186 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1

Continued next page
Pa
ge 187 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1

01-139


Malfunction on generator or
controller

- Check generator and controller

Malfunction cause found: Yes


- Erase DTC memory, test drive and after test drive, check DTC memory
again
Notes:

If the malfunction "18008" is displayed as a sporadic error, disregard malfunction display! This malfunction can be stored
when the engine runs for a fairly long time in idle with a lot of consumers on if the battery is quite discharged.
The malfunction "18008" is set as soon as the supply voltage lies under 10.08 V for longer than 1 sec (the control module
does not operate under 6.5 V).
Pa
ge 188 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1

01-140

Output on GST
and/or on VAG
1551 scan tool Possible malfunction cause

Malfunction repair
P1602 / 18010
Power Supply (B+)
Terminal 30
Low Voltage The malfunction is set when the
battery/control module is disconnected
with ignition on or with a starting attempt
with ignition/control module
disconnected

- The malfunction is erased after the second engine
start if there is sufficient supply voltage. Therefore,
start car after battery/control module is
disconnected; shut off and start car again, then
check DTC memory again.

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after test drive,
check DTC memory again
MIL Status:
MIL lights up
immediately Poor ground connection between
battery and body

- Check ground cable for good contact on battery
terminal and check the threaded connection on the
body

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after test drive,
check DTC memory again

Break in the wiring connection
between battery and Engine Control
Module (ECM) -J192-

- Check voltage supply of engine control module
page 28
-27


Malfunction cause found: Yes

- Erase DTC memory, test drive and after test drive,
Pa
ge 189 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1

check DTC memory again
Pa
ge 190 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1