1997 AUDI A4 AFC Engine On Board Diagnostic Multiport Fuel Injection Workshop Manual

01-131

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

Malfunction repair
P1505 / 17913
CTP Switch does not
Close
Open Circuit Floor mat presses on gas pedal

- Visual inspection

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after
test drive, check DTC memory again
MIL Status:
MIL lights up
immediately Throttle cable set too tight

Repair Manual, 2.8 Liter V6 2V Engine
Mechanical, Engine Code(s): AFC, Repair Group 20, Adjust throttle cable

- Adjust throttle cable

Malfunction cause found: Yes
No

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

Harness connector on -G69- and Closed
Throttle (CTP) switch -F60- 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
For troubleshooting
Malfunction cause found: Yes

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yp
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Display groups 000, 002,
004 No
Continued next page
- Erase DTC memory, test drive and after
test drive, check DTC memory again
Pa
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yp
e=re
pair&id=AUDI.B5.FU01.01.1

01-132


Closed Throttle (CTP) switch -F60- in Throttle
Position Sensor does not close or is faulty

- Check Closed Throttle (CTP) switch -F60- and adjust page 24
-73


Malfunction cause found: Yes
No

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

1st stage of throttle sticks

- Check throttle body for mechanical damage

Malfunction cause found: Yes
No

- Erase DTC memory, test drive, 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
Note:
The malfunction "P1505 / 17913" is set after 500 RPM has been exceeded (during start) and then a trip of at least 20 minutes
at under 100 km/h (63 mph) as soon as the idle switch has not been recognized as closed even once.
Pa
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) - Multi
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jection
(MFI
)
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pair&id=AUDI.B5.FU01.01.1

01-133

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

Malfunction repair
P1506 / 17914
CTP Switch does not
Open
Short to Ground Harness connector on Throttle Position (TP)
sensor -G69- and Closed Throttle (CTP) switch -
F60- 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

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and
after test drive, check DTC memory
again
MIL Status:
MIL lights up
immediately Closed Throttle (CTP) switch -F60- in the
Throttle Position Sensor does not open or is
faulty

- Check and adjust idle switch page 24
-73

Note:
Malfunction P0120 /
16504 is also stored Malfunction cause found: Yes
No

- Erase DTC memory, test drive and
after test drive, check DTC memory
again
For troubleshooting
Display groups 000,
002, 004
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:
Pa
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(OBD
) - Multi
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jection
(MFI
)
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play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1

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
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) - Multi
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jection
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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
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(OBD
) - Multi
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jection
(MFI
)
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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