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

01-1
On Board Diagnostic (OBD) - Multiport Fuel Injection (MFI) Engine Control Module (ECM) versions - overview

Engine control modules: 4A0 906 266 A
4A0 906 266 AA
4A0 906 266 AB
These are the introductory version and successor versions for the USA Audi 100 with On Board Diagnostic (OBD I). The
engine control modules are downwardly compatible. The function and structure of the system are described in Self-study
Program No. 130.
Engine control module: 8A0 906 266 B
With this version, the MFI ECM was completely modified. Important new features are:
- Oxygen sensor control with learning function; CO adjustment on Mass Air Flow (MAF) sensor eliminated.
- Coding of MFI ECM using VAG 1551 scan tool and "Code Control Module" function 07.
Engine control modules: 8A0 906 266 E
8A0 906 266 H
8A0 906 266 J
These are the successor versions of the 8A0 906 266 B control module.
Engine control module: 8A0 906 266 D
With this version, the On Board Diagnostic II (OBD II) was used in the Audi A6 with 2.8 liter V6, manual transmission and
front wheel drive. Important new features on vehicles with OBD II are:
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01-8

Connecting-m.y. 1997
Note:
The DLC is located below the driver's knee bar to
the left of the steering wheel.

All vehicles - Connect VAG1551 or VAG1552 Scan Tool (ST) with VAG1551/3
adapter to Data Link Connector (DLC).
V.A.G On Board Dia
gnostic
(OBD
) HELP
1 - Rapid data transfer2 - Blink code output

Indicated on display1) 1) Operating modes 1 and 2 are displayed alternately.
Notes: If there is no display, check voltage supply for data link connector:
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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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01-161

Display
group Display
shows Designation
036 Basic
setting 36
1 2 3 4 Three way catalytic convertor diagnosis, bank 2
037 Basic
setting 37
1 2 3 4 Sensor wheel learning value
038 Basic
setting 38
1 2 3 4 Current data on combustion misfiring recognition
039 Basic
setting 39
1 2 3 4 Statistical data on combustion misfiring recognition
040 Basic
setting 40
1 2 3 4 Heating current of heated oxygen sensors in front of and behind three way catalytic convertors
041 Basic
setting 41
1 2 3 4 Voltage signals of heated oxygen sensors in front of and behind three way catalytic convertor
042 Basic
setting 42 Diagnostic conditions for diagnosing the flank rise and flank fall time (response time) of the
voltage signals of the heated oxygen sensors in front of three way catalytic convertors
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01-166
Test table display group 001 Display
field Display on
VAG 1551 scan
tool Malfunction cause
Malfunction repair
1 Greater than
110
or
Less than 85
Engine Coolant Temperature (ECT)
sensor -G62-
Wiring connection to Engine Control
Module (ECM) -J192-
Coolant thermostat faulty
Repair Manual, 2.8 Liter V6 2V Engine
Mechanical, Engine Code(s): AFC, Repair Group 19
- Check DTC memory page 01
-13
- Check -G62- page 28
-25
- Check engine coolant thermostat
2 Less than 1.450
V
Large intake air leak between intake
manifold and Mass Air Flow (MAF)
sensor Repair cause
Greater than
1.580 V Electrical consumers on, steering wheel
at end stop, driving mode selected
(automatic transmission)
Tolerance for new engines: - Switch consumers off
- Center steering wheel
- Put selector lever in P or N position
display group 004, display field 4
Max. 1.660 V
When engine speed increases, the display
value increases to 2.500 V, falls to 0.000 V
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01-169

Display
field Display on VAG
1551 scan tool Malfunction cause
Malfunction repair
3 Outside tolerance
range
Closed Throttle Position (CTP)
switch activated or faulty CTP switch or throttle position
sensor -G69- incorrectly adjusted Electrical consumers onSteering wheel at end stopDriving mode selected (automatic
transmission) Moisture in connector for -G69-Ground point on intake manifold - Check DTC memory page 01
-13
- Check and adjust -G69- page 24
-77
- Switch electrical consumers off
- Center steering wheel
- Selector lever in P or N display group 004,
display field 4 - Visual inspection
- Check ground connection according to wiring
diagram
4 0 or 1
Closed Throttle Position (CTP)
switch -F60- faulty Throttle position sensor -G69-
incorrectly adjusted Throttle sticks Floor mat presses against
accelerator pedal Moisture in connector of -G69-Accelerator pedal cable adjustment Display group 011, display field 4
Repair Manual, 2.8 Liter V6 2V Engine
Mechanical, Engine Code(s): AFC, Repair Group 20
- Check DTC memory page 01
-13
- Check and adjust -F60- page 24
-73
- Visual inspection
- Adjust accelerator pedal cable:
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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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Steering wheel at end stopDriving mode selected (automatic
transmission) - Move selector lever to P or N
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01-174
Test table display group 004 Display
field Display on VAG
1551 scan tool Malfunction cause
Malfunction repair
1 Outside tolerance
range
Malfunction in the DTC memoryClosed Throttle Position (CTP) switch -
F60- activated or faulty Idle Air Control (IAC) valve -N71- faulty Electrical consumers onSteering wheel at end stop Driving mode selected (automatic
transmission) Throttle sticks, floor mat presses on
accelerator pedal, air leak - Check DTC memory page 01
-13
- Check -F60- page 24
-73
and display
group 002, display field 4
- Check -N71- page 24
-37
- Switch electrical consumers off
- Center steering wheel
- Move selector lever to P or N
- Repair cause
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01-175

Display
field Display on
VAG 1551 scan
tool Malfunction cause
Malfunction repair
2 Greater than
+14(HS)
and/or
greater than +
10(AT)
Idle Air Control (IAC) valve -N71- faulty
Electrical consumers on
Steering wheel at end stop
Driving mode selected (automatic transmission)
Intake manifold pump plugged in automatic transmission
EGR vacuum regulator solenoid valve -N18- open- Check DTC memory
page 01
-13
and/or display
group 018
- Switch electrical
consumers off
- Center steering wheel
- Move selector lever to P or
N
- Repair cause
- Check DTC memory
and/or display group 017,
display field 3
2 Less than -16
(HS)
and/or
less than -20
(AT)
Idle Air Control (IAC) valve -N71- faulty
Large air leak, manifold area, throttle stop not OK
Air leak on second stage of throttle - Check DTC memory
page 01
-13
and/or display
group 018
- Repair cause
3 Outside
tolerance range Only on vehicles with automatic transmission:

Display field 2 outside tolerance
If display field 2 is within tolerance, move selector lever to D Display field 2
- Check transmission
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(OBD
) - Multi
port Fuel In
jection
(MFI
)
11/22/2002 htt
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play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.01.1