1999 AUDI A4 wiring

01-95

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

Malfunction repair
P1105 / 17513
Heating Circ. (B1-S2)
Short to B+ Harness connector for Oxygen Sensor
(O2S) heater -Z29- (B1-S2) 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 of Oxygen Sensor
(O2S) heater -Z29- (B1-S2) faulty, or heater
-Z29- faulty

- Check O2S heater -Z29-(B1-S2) page 24
-55


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after
test drive, check DTC memory again
For troubleshooting
Display group 040
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 127 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

01-97

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

Malfunction repair
P1106 / 17514
(B2-S1) Voltage too
Low/Air Leak Harness connector for Heated Oxygen
Sensor (HO2S) 2 -G108- (B2-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 after
test drive, check DTC memory again
MIL Status:
MIL lights up
immediately Leak in Bank 1 exhaust system up to
Heated Oxygen Sensor (HO2S) 2 -G108-
(B2-S1)

- Find and repair leak

Malfunction cause found: Yes
No

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

Wiring connection to r Heated Oxygen
Sensor (HO2S) 2 -G108- (B2-S1) or -G108-
(B2-S1) faulty

- Check Heated Oxygen Sensor (HO2S) 2 -
G108- (B2-S1) page 24
-49

For troubleshooting
Display group 010
Malfunction cause found: Yes
No
Continued next page

- Erase DTC memory, test drive and after
test drive, check DTC memory again
Pa
ge 129 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

01-99

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

Malfunction repair
P1107 / 17515
Heating Circ. (B2-S1)
Short to B+ Harness connector for Oxygen Sensor
(O2S) heater -Z28- (B2-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 after
test drive, check DTC memory again
MIL Status:
MIL lights up
immediately Wiring connection of Oxygen Sensor
(O2S) heater -Z28- (B2-S1) faulty, or heater
-Z28- faulty

- Check O2S heater -Z28- (B2-S1) page 24
-51


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after
test drive, check DTC memory again
For troubleshooting
Display group 040
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 heating of the oxygen sensor probes in front of Three Way Catalytic Converter (TWC) is switched on with the fuel
pump relay, i.e. immediately at engine start.
Pa
ge 131 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

01-100

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

Malfunction repair
P1109 / 17517
(B2-S2) Voltage too
Low/Air Leak Harness connector for Heated Oxygen Sensor
(HO2S) -G131- (B2-S2) 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
Leak in bank 2 exhaust system between
Heated Oxygen Sensor (HO2S) 2 -G108- and
Oxygen Sensor (O2S) 2 behind Three Way
Catalytic Converter (TWC) -G131-

- Find and repair leak

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and
after test drive, check DTC memory
again
For troubleshooting
Display group 041
Wiring connection to Oxygen Sensor (O2S) 2
behind Three Way Catalytic Converter (TWC) -
G131- (B2-S2) faulty, or sensor -G131- faulty

- Oxygen Sensor (O2S) 2 behind Three
Way Catalytic Converter (TWC) -G131-
(B2-S2) page 24
-53


Malfunction cause found: Yes

- Erase DTC memory, test drive and
after test drive, check DTC memory
Pa
ge 133 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

01-102

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

Malfunction repair
P1110 / 17518
Heating Circ. (B2-S2)
Short to B+ Harness connector for Oxygen Sensor
(O2S) heater -Z30- (B2-S2) 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 for Oxygen Sensor
(O2S) heater -Z30- (B2-S2) faulty, or heater
-Z30- faulty

- Check O2S heater -Z30- (B2-S2) page 24
-55


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after
test drive, check DTC memory again
For troubleshooting
Display group 040
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 heating for Oxygen Sensor Probes behind Three Way Catalytic Converter (TWC) is not switched on immediately at
engine start, but when the calculated exhaust gas temperature drops below 308 C (586 F) ( Read measuring value
Pa
ge 136 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

01-103

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

Malfunction repair
P1201 / 17609
Cyl.1-Fuel Injector Circ.
Electrical Malfunction
-----------------------
P1202 / 17610
Cyl.2-Fuel Injector Circ.
Electrical Malfunction
_______________________
P1203 / 17611
Cyl.3-Fuel Injector Circ.
Electrical Malfunction
_______________________ Are all 6 fuel injectors stored in the DTC
memory with the malfunction type "Cyl. X
Electrical circuit electrical malfunction" and
malfunction P1500 / 17908
"Fuel pump relay Electrical circuit electrical
malfunction"?
No
Yes

- Check Fuel pump relay and
control page 24
-24


Malfunction cause found: Yes
No

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

Wiring connection to Cylinder 1, 2, or 3

- Check fuel injectors page 24
-
Pa
ge 138 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

01-105

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

Malfunction repair
P1204 / 17612
Cyl.4-Fuel Injector Circ
Electrical Malfunction
-----------------------
P1205 / 17613
Cyl. 5-Fuel Injector Circ
Electrical Malfunction
_______________________
P1206 / 17614
Cyl. 6-Fuel Injector Circ
Electrical Malfunction
_______________________ Are all 6 fuel injectors stored in DTC memory
with the malfunction "Cyl. X-Fuel Injector Circ
Electrical Malfunction" and with DTC P1500 /
17908 "Fuel Pump Relay Circ Electrical
Malfunction"?
No
Yes

- Check fuel pump relay and
control page 24
-24


Malfunction cause found: Yes
No

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

Wiring connection to Cylinder 4, 5, or 6 fuel

- Check fuel injectors page
Pa
ge 141 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

01-106
Notes:

If the malfunction "P1204 / 7612" and/or "P1205 / 17613" and/or "P1206 / 17614" is recognized by the engine control
module, the oxygen sensor control for bank 2 is blocked.
If all 6 fuel injectors are stored with the malfunction type "Cyl. X Electrical circuit electrical malfunction" the malfunction
"P1500 / 17908" is also set.
Output on GST and/or on VAG
1551 scan tool Possible malfunction cause

Malfunction repair
P1213 / 17621
Cyl.1-Fuel Injector Circ.
Short to B+
-----------------------
P1214 / 17622
Cyl.2-Fuel Injector Circ.
Short to B+
_______________________
P1215 / 17623
Cyl.3-Fuel Injector Circ. Wiring connection to Cylinder 1, 2,
or 3 fuel injectors faulty, or fuel
injectors -N30-, -N31- or -N32- faulty
Yes

- Check fuel injectors page 24
-29
Pa
ge 143 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