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

01-72

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

Malfunction repair
P0332 / 16716
Knock Sensor 2 Circuit
Low Input (Bank 2) Malfunction P0327 / 16711 "Knock
Sensor 1 Circuit Low Input (Bank 1 or
Single Sensor)" also in DTC memory
No
Yes

- Check knock sensor 1 -G61- and 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
MIL Status:
MIL lights up
immediately
Harness connector for Knock Sensor
(KS) 2 -G66- 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
For troubleshooting
Display group 016
Knock Sensor (KS) 2 -G66- loose

- Check mounting of knock sensor 2 -G66-
and if necessary retighten use insert 3247;
tightening torque 20 Nm (15 ft lb)

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after test
drive, check DTC memory again
Pa
ge 97 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 98 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

01-74

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

Malfunction repair
P0337 / 16721
Crankshaft Position
Sensor Circuit Low
Input Harness connector for Crankshaft Position
(CKP) sensor -G4- 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 after
test drive, check DTC memory again
MIL Status:
MIL lights up
immediately Crankshaft Position (CKP) sensor -G4-
loose or distance to groove on crankshaft
counterweight greater than 1.3 mm (0.053
in.)

- Check crankshaft position sensor -G4- for
correct installation and tight fit

Malfunction cause found: Yes
No

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

Wiring connection to Crankshaft Position
(CKP) sensor -G4- faulty, or sensor -G4-
faulty

- Check crankshaft position sensor -G4-
page 28
-19


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after
test drive, check DTC memory again
Pa
ge 100 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 101 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

01-75


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 "P0337 / 16721" is set at an engine speed between 25 RPM and 400 RPM as soon as no crankshaft sensor
signal is recognized for longer than 3 sec.
Pa
ge 102 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

01-76

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

Malfunction repair
P0401 / 16785
Exhaust Gas Recirculation
Flow Insufficient Detected EGR system vacuum hose kinked or fallen
off

- Check vacuum hoses

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and
after test drive, check DTC memory
again
MIL Status:
MIL lights up after 2 Trips Leak in a vacuum hose of the EGR system
(e.g. cracked, worn though, etc.)

- Check vacuum hoses for leaks

Malfunction cause found: Yes
No

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

Vacuum hose between EGR vacuum
regulator solenoid valve -N18- and mechanical
EGR valve plugged

- Check vacuum hoses for
obstructions
For troubleshooting
Display group 017
Malfunction cause found: Yes
No
Continued next page

- Erase DTC memory, test drive and
after test drive, check DTC memory
again
Pa
ge 103 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