spark plugs AUDI A4 1997 B5 / 1.G AFC Engine On Board Diagnostic Multiport Fuel Injection Workshop Manual

01-58


Malfunction on spark plug(s) or ignition cable(s)
of Bank 1

- 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 plugs

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check DTC memory

Malfunction in the fuel injectors in Bank 2
because of
- Resistance in the fuel injector connectors
- Fuel injector that is dirty, faulty or has carbon
deposits

- Check harness connector on fuel injector for tight fit
- Check fuel injection quantity and for leaks page 24
-33

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check DTC memory

Intake valves have carbon deposits

- Check intake valves for carbon deposits, if necessary clean
valves

Malfunction cause found: Yes
No

- Erase DTC memory, test drive and check DTC memory

Continue Troubleshooting per Diagnostic Trouble Code (DTC) table page 01
-16

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01-171
Test table display group 003 Display
field Display on VAG
1551 scan tool Malfunction cause
Malfunction repair
1 Greater than 750
RPM
Closed Throttle Position (CTP)
switch -F60- Large air leak quantity Idle Air Control (IAC) valve -N71-
sticks or is hard to move Rear windshield heater on Display group 04, display field 4
- Check -F60- page 24
-73
- Repair cause
- Check using output diagnostic test mode
page 01
-145

- Switch electrical consumers off
Less than 650 RPM
Idle Air Control (IAC) valve -N71-
sticks or is hard to move Closed Throttle Position (CTP)
switch -F60- Driving mode selected (automatic
transmission) Display group 004, display field 4
- Check using output diagnostic test mode
page 01
-145

- Check -F60- page 24
-73
- Move selector lever to P or N
2 Outside tolerance
range
Poor idle (not running on all
cylinders) Mass Air Flow (MAF) sensor -G70-
faulty Idle Air Control (IAC) valve -N71-
faulty Electrical consumers on- Fuel injectors or spark plugs faulty
- Check DTC memory page 01
-13
and/or
display group 001, display field 2 and 3
- Check DTC memory page 01
-13
and/or
display group 018
- Switch electrical consumers off
- Center steering wheel
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jection
(MFI
)
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pair&id=AUDI.B5.FU01.01.1

01-180
Notes on display groups 005 and 006:
If there are differences in oxygen sensor learning values ( display group 010, display fields 1 and 2 ) of more than 8%
between display group 005 (bank 1) and display group 006 (bank 2), the following malfunctions are possible:
Spark plugs faulty
Fuel injectors faulty (leaking, plugged)
Intake air leak on one side
Heated Oxygen Sensor (HO2S) faulty, dirty
Mechanical engine basic settings (valve/camshaft timing) not OK
If a difference of 9% is reached between the richest and leanest oxygen sensor learning value of one display group, further
learning will be discontinued in the two affected learning ranges ( display group 007 and/or 008). Learning requirements
display ( display groups 007 and/or 008) of these learning ranges cannot be 1.
If there is no power to the engine control module, all values are set back to 0.0%.
Pa
ge 252 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