check oil AUDI A4 1998 B5 / 1.G AFC Engine On Board Diagnostic Multiport Fuel Injection Workshop Manual

01-52

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

Malfunction repair
P0170 / 16554
Fuel Trim Malfunction (Bank 1) Air leak in the area of the intake
manifold

- Find and repair leak

Malfunction cause found: Yes
No

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

Oil dilution (fuel in the oil) because
of frequent cold starts or driving short
distances

- Check, if necessary do oil change
MIL Status:
MIL lights up after 2 Trips Malfunction cause found: Yes
No

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

Mass Air Flow (MAF) sensor -G70-
supplies false signal

- Check Mass Air Flow (MAF) sensor -
G70- page 24
-81

For troubleshooting Display
groups 005, 007, 009 and 010
Malfunction cause found: Yes
No

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

Oil burning with faulty piston

Repair Manual, 2.8 Liter V6 2V Engine
Mechanical, Engine Code(s): AFC, Repair Group 15
- Check compression pressure

Malfunction cause found: Yes

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01-56

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

Malfunction repair
P0173 / 16557
Fuel Trim Malfunction (Bank 2) Air leak in the area of the manifold

- Find and repair leak

Malfunction cause found: Yes
No

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

Oil diluted (fuel in the oil) because
of frequent cold starts for driving short
distances

- Check and change oil if necessary
MIL Status:
MIL lights up after 2 Trips Malfunction cause found: Yes
No

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

Mass Air Flow (MAF) sensor -G70-
supplies false signal

- Check Mass Air Flow (MAF) sensor -
G70- page 24
-81

For troubleshooting Display
groups 006, 008, 009 and 010
Malfunction cause found: Yes
No
Continued next page

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

Oil burning with faulty piston

Repair Manual, 2.8 Liter V6 2V Engine
Mechanical, Engine Code(s): AFC, Repair - Check compression pressure
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01-63


Has combustion misfiring only been recognized on one
or two cylinders (2/4 or 3/5 or 1/6)?
No
Yes

- Spark harness connector loose or faulty check- Check ignition cable for damage (e.g. cracks, traces
of burns, worn places)
- Check face side of spark plug
- Fuel injector of the cylinder faulty; check fuel injector
page 24
-29


Malfunction cause found: Yes
No

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

Has combustion misfiring occurred on two cylinders
(2/4 or 3/5 or 1/6)?
No Yes

- Common ignition coil of both affected cylinders
faulty, check ignition coil page 28
-16


Malfunction cause found: Yes
No
Continued next page

- Erase DTC memory, test drive and check DTC
memory
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01-66


Has combustion misfiring been recognized on only
one or two cylinders (2/4 or 3/5 or 1/6)?
No
Yes

- Spark harness connector loose or faulty check- Check ignition cable for damage (e.g. cracks, traces
of burns, worn places)
- Check face side of spark plug
- Fuel injector of the cylinder faulty Check fuel
injector page 24
-29


Malfunction cause found: Yes
No


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

Has misfiring occurred on two cylinders (2/4 or 3/5 or
1/6)?
No Yes

- Common ignition coil for the two cylinders affected
faulty, check ignition coil page 28
-16


Malfunction cause found: Yes
No
Continued next page

- Erase DTC memory, test drive and check DTC
memory
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01-115


Camshaft Position (CMP) sensor -G40- oily or dirty
on the inside because of leaking seal on the cylinder
head.

- Camshaft Position (CMP) sensor -G40- and check for
contamination. If it is oily, replace seal on cylinder head

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
Notes:

The malfunction "P1340 / 17748" is set as soon as the crankshaft position sensor signal is always "high" at an engine
speed between 50 RPM and 4000 RPM and with more than 20 crankshaft sensor signals recognized.
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jection
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01-116

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

Malfunction repair
P1341 / 17749
Ignition Coil Power
Output Stage 1
Short to Ground
-----------------------
P1343 / 17751
Ignition Coil Power
Output Stage 2
Short to Ground
-----------------------
P1345 / 17753
Ignition Coil Power
Output Stage 3
Short to Ground
----------------------- Harness connector for ignition coil power
output stage -N122- 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

- Erase DTC memory, test drive and after test
Pa
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jection
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No
drive, check DTC memory again

Wiring connection to ignition coil power
output stage -N122- faulty or power output
stage -N122- faulty

- Check Power output stage -N122- for
ignition coils page 28
-13


Malfunction cause found: Yes
No

- Erase DTC memory, test drive and after test
drive, check DTC memory again
MIL Status:
MIL lights up
immediately
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 power output stage is not integrated in the Engine Control Module (ECM) -J192-, it is a separate component.
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01-117

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

Malfunction repair
P1391 / 17799
Camshaft Pos.Sensor
(B2)
Short to Ground Harness connector on Camshaft Position
(CMP) sensor -G40- 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 Camshaft Position
(CMP) sensor -G40- faulty or sensor -G40-
faulty

- Check Camshaft Position (CMP) sensor -
G40- page 28
-33


Malfunction cause found: Yes
No

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

Camshaft Position (CMP) sensor -G40-
oily or dirty on the inside because of leaking
seal on the cylinder head

- Remove Camshaft Position (CMP) sensor -
G40- and check for contamination. If it is
oily, replace seal on cylinder head

Malfunction cause found: Yes
No
Continued next page

- Erase DTC memory, test drive and after
test drive, check DTC memory again
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jection
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01-120


Camshaft Position (CMP) sensor -G40- oily or
dirty on the inside because of leaky seal on cylinder
head

- Remove Camshaft Position (CMP) sensor -G40- and
check for contamination. If it is oily, replace seal on cylinder
head

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

check DTC memory and test drive check DTC
memory
Notes:

The malfunction "P1392 / 17800"is set as soon as the crankshaft position sensor signal is always "high" at an engine
speed between 50 RPM and 4000 RPM and with more than 20 crankshaft sensor signals recognized.
Pa
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jection
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)
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01-121

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

Malfunction repair
P1393 / 17801
Ignition Coil Power
Output Stage 1
Electrical Malfunction
-----------------------
P1394 / 17802
Ignition Coil Power
Output Stage 2
Electrical Malfunction
-----------------------
P1395 / 17803
Ignition Coil Power
Output Stage 3
Electrical Malfunction
----------------------- Harness connector for Power output stage
-N122- for ignition coils 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

- Erase DTC memory, test drive and after
Pa
ge 163 of 366 On Board Dia
gnostic
(OBD
) - Multi
port Fuel In
jection
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)
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play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1