1999 AUDI A4 coolant temperature

01-71


Wiring connection to Knock Sensor (KS) 1 -
G61- faulty, or sensor -G61- faulty

- Check knock sensor 1 -G61- page 28
-29

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and 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 "P0327 / 16711" is set if the output voltage of the knock sensor is too low (below 0.2 V) (coolant temperature
over 20 C (68 F)/ engine speed greater than 3500 RPM and engine load greater than 16%). The ignition angle is then
retarded by 12 crankshaft in the knocking areas of the map (engine load greater than 40%).
Pa
ge 96 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

01-73


Wiring connection to Knock Sensor (KS) 2 -
G66- faulty or sensor -G66- faulty

- Check knock sensor 2 -G66- page 28
-29

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
Note:
The malfunction "P0332 / 16716" is set when the knock sensor output voltage is too low (under 0.2 V) (coolant temperature
over 20 C (68 F) / engine speed greater than 3500 RPM and engine load greater than 16%). The ignition angle is then
retarded by 12 crankshaft in the knocking ranges of the map (engine load greater than 40%).
Pa
ge 99 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

01-77


EGR vacuum regulator solenoid valve -N18- sticks
in closed position

- Check EGR vacuum regulator solenoid valve -N18-
page 24
-67


Malfunction cause found: Yes
No

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

EGR valve sticks in closed position

- Check mechanical EGR valve page 24
-70

Malfunction cause found: Yes


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

Recognition condition for the malfunction "P0401 / 16785" (mech. valve continuously closed) is a coolant temperature over
72 C (162 F), an open idle switch, a throttle angle less than 42.5 , a vehicle speed between 70 km/h and 105 km/h (44
and 66 mph), an EGR duty cycle greater than 50%, an engine speed between 1500 RPM and 3300 RPM and an engine
load between 23% and 60%. If all these conditions are fulfilled and the EGR temperature signal is less than 50 C (122
F) for longer than 34 sec, the malfunction "P0401 / 16785" is set.
Pa
ge 104 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

The malfunction "16786" (mech. valve continuously open) is set if after a cold start (-12 C to 30 C (10 to 86 F) coolant
temperature) the EGR temperature is greater than 50 C (122 F) at a coolant temperature of 35 C (95 F).
Pa
ge 106 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

01-86

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

Malfunction repair
P0501 / 16885
Vehicle Speed Sensor
Range/Performance Wiring connection between vehicle speed
sensor and engine control module has open
circuit

- Check vehicle speed signal page 24
-97

MIL Status:
MIL lights up immediately Malfunction cause found: Yes


- Erase DTC memory, test drive and
after test drive, check DTC memory
again
For troubleshooting Display
group 019

Notes:
The malfunction "P0501/ 16885" is set after engine start as soon as, at a coolant temperature over 80 C (176 F) and an
engine speed signal between 1300 RPM and 6000 RPM the vehicle speed signal during a deceleration fuel shut off is less
than 1 km/h (1 mph). The duration of the deceleration fuel shut off must be longer than 3 sec.
Pa
ge 116 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

01-91


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 "P1101 / 17509" is set 123 sec after engine start and at a coolant temperature over 30 C (86 F) as soon as
the oxygen sensor control has reached the rich limit for 2 sec more than 20 times (or 40 sec. without interruption).
Pa
ge 122 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

01-94


Wiring connection to Oxygen Sensor (O2S) behind Three
Way Catalytic Converter (TWC) -G130- (B1-S2) faulty, or
sensor -G130- faulty

- Check O2S behind three way catalytic converter -
G130- (B1-S2) page 24
-53


Malfunction cause found: Yes
No
Continued next page

- 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
Note:
The malfunction "P1104 / 17512" is set 123 sec after engine start, coolant temperature over 80 C (176 F), oxygen sensor
control active, engine speed between 1500 min and 5000 min, load between 19% and 80% and probe heater switched on at
least 45 sec, as soon as the signal voltage is less than 0.040 V for longer than 60 sec.
Pa
ge 126 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

01-98


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 "P1106 / 17514" is set 123 sec after engine start, with a coolant temperature over 30 C (86 F) as soon as
the oxygen sensor control has reached the rich limit for 2 sec more than 20 times (or 40 sec. without interruption).
Pa
ge 130 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