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

01-242

X
X
X
X
X
X
X
X
Meaning of 8-digit display "Diagnosis Condition 2"

1 = Three way catalytic converter diagnosis, bank 2 active

2 = Engine load: 27 - 66% ( display group 003 )
3 = Engine speed: 1800 - 2700 RPM ( display group 003)
4 = Vehicle speed: 80 - 100 km/h (50 - 63 mph) ( display group 003)
5 = Three way catalytic converter diagnosis, bank 1 active

6 = Value does not drop below or exceed oxygen sensor control limit ( display group 007
and/or 008)
7 = Intake air mass through Mass Air Flow (MAF) sensor: 12 - 36 g/sec ( display group 019)

8 = Calculated exhaust gas temperature in three way catalytic converter: 400 - 640 C (752 -
1184 F)
Pa
ge 338 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

01-244
Display group 099 Display
shows Display/specified
value Designation/diagnosis
Basic
setting 99
1 2 3 4 ... RPM 1 = Momentary engine speed Display group 003, display field 1 ...% 2 = Momentary engine load display group 003, display field 2
... C
3 = Coolant temperature display group 001, display field 1

-Control OFF
and/or
-Control ON
4 = Oxygen sensor control OFF in "Basic Setting" function 04; Oxygen sensor control
ON in "Read Measuring Value Block" function 08
Notes on display field 4:

For defined troubleshooting, the oxygen sensor control is switched off when display group 099 is selected under "Basic
Setting" function 04, and switched on when display group 099 is selected under "Read Measuring Value Block"function
08. When leaving "Basic Setting" function 04, oxygen sensor control is automatically active again.
You can switch back and forth between "Basic Setting" function 04 and "Read Measuring Value Block" function 08 by
pressing buttons -4- and -8- on the VAG 1551 scan tool.
Pa
ge 340 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

01-245

Engine Control Module (ECM), coding


Notes:

During Engine Control Module (ECM)
identification, a 5-digit code must always be
displayed.
Coding is carried out with the VAG 1551 scan
tool.
If coding that corresponds to the vehicle is not
displayed or if the ECM has to be replaced, the
ECM must be coded as follows:

- Connect VAG 1551 scan tool page 01
-7 .
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -7- to select "Code Control Module" function 07.
Rapid data transfer
Q
07 - Code Control Module

Indicated on display
- Press -Q- button to confirm input.
Code control module QEnter code number XXXXX
(0-32000
)

Indicated on display
- Enter code number for vehicle and press -Q- button to confirm input.
Coding variations page 01
-247
.
Pa
ge 341 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

01-247
Engine Control Module (ECM), coding variations
Country/exhaust gas
Drive/auxiliary function
Transmission
Vehicle type
00 = ----------------- 0 = Front wheel drive without
traction control 0 = 5-speed manual
transmission 0 = --------------
----
01 = Vehicle with Exhaust Gas
Recirculation (EGR) 1 = Front wheel drive with traction
control 1 = ------------------ 1 = A4
02 = ----------------- 2 = All wheel drive without traction
control 2 = ------------------ 2 = --------------
----
03 = ----------------- 3 = ------------------ 3 = ------------------ 3 = --------------
----
04 = ----------------- 4 = ------------------ 4 = ------------------ 4 = --------------
----
05 = ----------------- 5 = ------------------ 5 = Automatic trans. 01V 5 = --------------
----
06 = ----------------- 6 = ------------------ 6 = ------------------ 6 = --------------
----
Pa
ge 344 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

01-258

Generating readiness code

Notes:

In order to generate the readiness code, a
"mixed city and highway" drive (short test) has
to be taken. A "mixed city and highway" drive is
understood as approx. 1-1/2 to 5 minutes at 80-
100 km/h (50-63 mph) with manual
transmission in 4th or 5th gear, or automatic
transmission selector lever in "D" position,
preferably in 4th gear.
If a malfunction is recognized and stored by the
engine control module during a "mixed city and
highway" trip, and/or the Malfunction Indicator
Lamp (MIL) is switched on, the brief test can be
interrupted by the technician and the
malfunction repaired according to the diagnostic
trouble code.
If the readiness code has to be generated, the
DTC memory should be checked (no faults
should be stored) and erased (readiness code
will be reset) before taking the "mixed city and
highway" trip.
Pa
ge 357 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

01-259

Step 1: Preparation

- Start engine and let idle.

- Connect VAG 1551 or VAG 1552 scan tool,
switch on printer and select address word 01 (
page 01
-7 )

- Check and erase DTC memory ( page 01
-
13
).

No malfunctions may be stored. If necessary:

- Repair malfunctions.

- Erase DTC memory.

- Stop engine and start again.

- Test drive and, as a check, check and erase
DTC memory again.

- After checking and erasing DTC memory, let
engine run at idle again.
Pa
ge 358 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

01-265

Engine Control Module (ECM), replacing


Notes:

By disconnecting the ECM, the permanent
voltage supply is disconnected and therefore
the learning values, DTC memory and
readiness code are erased.
If uneven idle occurs after the ECM is installed,
let the engine idle for a few minutes so that the
learning process can be carried out page 01
-
150
, Basic Setting, display groups 007 and/or
008.
If the engine control module is replaced, carry
out the following work steps in the specified
sequence.

- Switch ignition on.

- Connect VAG 1551 scan tool and operate until
control module identification is displayed page
01
-7 .
8D0906266 2.8l V6/2V MPI OBD2
D01
Codin
g 01051
WSC 06388

ECM identification and the coding are shown on the display.
- Print out ECM identification and compare coding to table of coding
variations page 01
-247
.
-
Press button.
Pa
ge 364 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