check engine AUDI A4 1996 B5 / 1.G AFC Engine On Board Diagnostic Multiport Fuel Injection Service Manual

01-69


Metal chips on engine speed (RPM) sensor -G28- or
distance from the engine speed (RPM) sensor -G28- to the
flywheel ring greater than 1.2 mm (0.049 in.)

- Remove engine speed (RPM) sensor -G28-,
check for contamination, clean if necessary

Malfunction cause found: Yes
No

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

Wiring connection to engine speed (RPM) sensor -G28-
faulty or sensor -G28- faulty

- Check and adjust engine speed (RPM) sensor -
G28- page 28
-21


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:
If the malfunction "P0322 / 16706" is recognized during engine start, no ignition or fuel injection occurs.
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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
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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
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jection
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e=re
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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
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jection
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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
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jection
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)
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01-83

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

Malfunction repair
P0452 / 16836
Evaporative Emission
Control System Pressure
Sensor Low Input Harness connector on sensor for EVAP
canister -G172- (differential pressure sensor)
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 Wiring connection to sensor for EVAP
canister -G172- (differential pressure sensor)
faulty, or sensor -G172- faulty

- Check sensor for EVAP canister -
G172- (differential pressure sensor)
page 24
-61


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and
after test drive, check DTC memory
again
For troubleshooting
Display group 030
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 "P0542 / 16836" is set as soon after engine start as the differential pressure sensor signal is less than 0.1 V
Pa
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jection
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)
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play?action=Goto&t
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e=re
pair&id=AUDI.B5.FU01.01.1

01-84

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

Malfunction repair
P0453 / 16837
Evaporative Emission
Control System Pressure
Sensor High Input Harness connector on sensor for EVAP
canister -G172- (differential pressure sensor)
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 Wiring connection to sensor for EVAP
canister -G172- (differential pressure sensor)
faulty, or sensor -G172- faulty

- Check sensor for EVAP canister -
G172- (differential pressure sensor)
page 24
-61


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and
after test drive, check DTC memory
again
For troubleshooting
Display group 030
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 "P0453 / 16837" is set as soon after engine start as the differential pressure sensor signal is greater than 5.0
Pa
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jection
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)
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e=re
pair&id=AUDI.B5.FU01.01.1

01-85

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

Malfunction repair
P0461 / 16845
Fuel Lever Sensor Circuit
Range/Performance Wiring connection between Engine Control
Module (ECM) -J192- and instrument panel
insert faulty

- Check fuel level signal page 24
-
107


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 Malfunction on instrument cluster or fuel
level sensor

Repair Manual, Electrical
Equipment - Check instrument cluster
For troubleshooting Display
group 027
Malfunction cause found: Yes


- Erase DTC memory, test drive and
after test drive, check DTC memory
again
Note:
The malfunction "P0461 / 16845" is set with ignition on as soon as a voltage signal over 10.8 V is recognized for longer than
15 sec.
Pa
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(OBD
) - Multi
port Fuel In
jection
(MFI
)
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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
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) - Multi
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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

01-87

Output on GST and/or on
VAG 1551 scan tool Possible malfunction
cause
Malfunction repair
P0605 / 16989
Internal Control Module Read
Only Memory (ROM) Error
(Module Identification Defined
by SAE J1979) Engine Control Module
(ECM) -J192- faulty

- Replace engine control module code vehicle
erase DTC memory and test drive check DTC
memory
MIL Status:
MIL lights up immediately Note:
The malfunction type "control module faulty" is set in the ROM/RAM or EEPROM when malfunctions are recognized.
Pa
ge 117 of 366 On Board Dia
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(OBD
) - Multi
port Fuel In
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