1996 AUDI A4 AFC Engine On Board Diagnostic Multiport Fuel Injection Workshop Manual

01-29

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

Malfunction repair
P0116 / 16500
Engine Coolant Temperature
Circuit Range/Performance
Problem Harness connector on Engine Coolant
Temperature (ECT) sensor -G62- loose or
corroded due to dampness in the harness
connector

- Check harness connector for tight fit
and contact corrosion, if necessary
reconnect and/or clean, installation
location page 28
-7

Malfunction cause found: Yes
No

- Erase DTC memory, test drive, after
test drive check DTC memory again
MIL Status:
MIL lights up immediately Wiring conection to Engine Coolant
Temperature (ECT) sensor -G62- faulty,
or sensor -G62- faulty

- Engine Coolant Temperature (ECT)
sensor -G62-, checking page 28
-25


Malfunction cause found: Yes
No

- Erase DTC memory, test drive, after
test drive check DTC memory again
For troubleshooting Display
groups 000, 001
Engine Control Module (ECM) -J192-
faulty

- Replace and code engine control
module page 01
-265
erase DTC
memory and test drive check DTC
memory
Notes:
The malfunction "P0116 / 16500" is set as soon as the coolant temperature lies under 55 C (131 F) after engine start, but
18 minutes later the temperature has not risen to over 70 C (158 F).
Pa
ge 41 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

01-30

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

Malfunction repair
P0117 / 16501
Engine Coolant
Temperature Circuit
Low Input Harness connector on Engine Coolant
Temperature (ECT) sensor -G62- loose or
corroded due to dampness in the harness
connector

- Check harness connector for tight fit and
contact corrosion, if necessary reconnect
and/or clean, installation location page 28
-7

Malfunction cause found: Yes
No

- Erase DTC memory, test drive, after test
drive check DTC memory again
MIL Status:
MIL lights up
immediately Wiring connection to Engine Coolant
Temperature (ECT) sensor -G62- faulty, or
sensor -G62- faulty

- Engine Coolant Temperature (ECT)
sensor -G62-, checking page 28
-25


Malfunction cause found: Yes
No

- Erase DTC memory, test drive, after test
drive check DTC memory again
For troubleshooting
Display groups 000,
001
Engine Control Module (ECM) -J192-
faulty

- Replace and code engine control module
page 01
-265
erase DTC memory and
test drive check DTC memory
Notes:
The malfunction "P0117 / 16501" is set as soon as the signal voltage drops below 0.10 volts for longer than 1 sec when
ignition is switched on (corresponds to a coolant temperature over 200 C (392 F).
Pa
ge 42 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

01-31

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

Malfunction repair
P0118 / 16502
Engine Coolant
Temperature Circuit
High Input Harness connector on Engine Coolant
Temperature (ECT) sensor -G62- 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 28
-7

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check
DTC memory again
MIL Status:
MIL lights up
immediately Wiring connection to Engine Coolant
Temperature (ECT) sensor -G62- faulty, or
sensor -G62- faulty

- Check Engine Coolant Temperature
(ECT) sensor -G62- page 28
-25


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check
DTC memory again
For troubleshooting
Display groups 000,
001
Engine Control Module (ECM) -J192-
faulty

- Replace and code engine control module
page 01
-265
erase DTC memory and
test drive check DTC memory
Notes:
The malfunction "P0118 / 16502" is set as soon as the signal voltage is over 4.98 volts for longer than 1 sec with ignition on
(corresponds to a coolant temperature below -50 C (-58 F)).
Pa
ge 43 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

01-32

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

Malfunction repair
P0120 / 16504
Throttle Position Sensor
A Circuit Malfunction Harness connector on Throttle Position
(TP) sensor -G69- 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 check
DTC memory again
MIL Status:
MIL lights up
immediately Closed Throttle Position (CTP) switch -
F60- in throttle position sensor does not
open or is faulty

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

Note:
The malfunction P1506 /
17914 is also stored Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check
DTC memory again
For troubleshooting
Display group 002
Engine Control Module (ECM) -J192-
faulty

- Replace and code engine control module
page 01
-265
erase DTC memory and
test drive check DTC memory
Notes:
The malfunction "P0120 / 16504" is set, with idle switch closed, as soon as a position sensor signal voltage of over 0.72 volts
is recognized for longer than 2 sec. (corresponds to a throttle opening of more than 7 ).
Pa
ge 44 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

01-33

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

Malfunction repair
P0121 / 16505
Throttle Position Sensor A
Circuit Range/ Performance
Problem Harness connector on Throttle Position
(TP) sensor -G69- 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
check DTC memory again
MIL Status:
MIL lights up immediately Harness connector on Mass Air Flow
(MAF) sensor -G70- 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
check DTC memory again
For troubleshooting Display
group 002
Throttle Position (TP) sensor -G69- loose,
incorrectly adjusted or shaft connection
eccentric

- Check and adjust throttle position
sensor -G69- page 24
-77

Notes:
The malfunction "P0121 / 16505" is set at a coolant temperature of over 70 C (158 F), engine speed between 1500 RPM
and 3500 RPM for longer than 2 seconds and an engine load over 66% (Mass Air Flow sensor signal) as soon as the sensor
signal voltage is less than 0.96 volts (corresponds to a throttle opening less than 12 ).
Pa
ge 45 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

01-34

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

Malfunction repair
P0122 / 16506
Throttle Position Sensor
A Circuit Low Input Harness connector on Throttle Position
(TP) sensor -G69- 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 check
DTC memory again
MIL Status:
MIL lights up
immediately
Wiring connection to Throttle Position
(TP) sensor -G69- faulty, or sensor -G69-
faulty

- Check throttle position sensor -G69-
page 24
-77


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check
DTC memory again
For troubleshooting
Display group 002
Engine Control Module (ECM) -J192-
faulty

- Replace and code engine control module
page 01
-265
erase DTC memory and
test drive check DTC memory
Notes:
The malfunction "P0122 / 16506" is set as soon as the signal voltage is less than 0.1 volts for longer than 2 sec at an engine
speed of over 6000 RPM.
Pa
ge 46 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

01-35

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

Malfunction repair
P0123 / 16507
Throttle Position Sensor
A Circuit High Input Harness connector on Throttle Position
(TP) sensor -G69- 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 check
DTC memory again
MIL Status:
MIL lights up
immediately
Wiring connection to Throttle Position
(TP) sensor -G69- faulty, or sensor -G69-
faulty

- Check throttle position sensor -G69-
page 24
-77


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check
DTC memory again
For troubleshooting
Display group 002
Engine Control Module (ECM) -J192-
faulty

- Replace and code engine control module
page 01
-265
erase DTC memory and
test drive check DTC memory
Notes:
The malfunction "P0123 / 16507" is set as soon as the signal voltage is greater than 4.9 volts for longer than 2 sec.
Pa
ge 47 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

01-36

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

Malfunction repair
P0130 / 16514
O2 Sensor Circuit
Malfunction (Bank 1
Sensor 1) Wiring conection to Heated Oxygen
Sensor (HO2S) -G39- (B1-S1) 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 check
DTC memory again
MIL Status:
MIL lights up
immediately Wiring conection to Heated Oxygen
Sensor (HO2S) -G39- (B1-S1) faulty, or
HO2S -G39- faulty

- Check HO2S -G39- (B1-S1) page 24
-49

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check
DTC memory again
For troubleshooting
Display group 010
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 "P0130 / 16514" is set as soon as the difference between minimum and maximum signal voltage is less than
500 mV at an engine temperature over 80 C (176 F), 60 sec after start of control.
Pa
ge 48 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