1998 AUDI A4 OBD port

01-205
Display group 023 Display shows
Display/specified value
Designation
Basic setting 23
1 2 3 4 X 1 = Upshift or downshift signal
XX 2 = Gear recognition signal and shifting signal
XX 3 = A/C compressor off/on and rear window heater signal
X 4 = A/C compressor shut-off Notes on display field 1:

The signal for upshift and downshift will only be output by the Transmission Control Module (TCM) for the automatic
transmission 01V. For vehicles without automatic transmission 01V, a "1" is always displayed.
Check upshift and downshift signal page 24
-103
.
X
Meaning of 1-digit display:

With vehicle not running:
Value "0" = Selector lever in R
Value "1" = Selector lever in 2,3,4,D,P,N

When driving-vehicle speed greater than 14 km/h (9 mph):
Value "0" = Ignition angle retarded for downshift selected
Pa
ge 289 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

Value "1" = Ignition angle retarded for upshift selected
Pa
ge 290 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

01-206
Note on display field 2: X
X
Meaning of 2-digit display:

1 = Shifting signal (ignition angle retard):
Value "0" = Ignition angle retarding not active
Value "1" = Ignition angle retarding active
Notes:

Because of the brief signal, the shift is not always displayed.
On vehicles without automatic transmission, "0" is always displayed.
Check shift signal page 24
-101
.

2 = Gear recognition signal:
Value "0" = Selector lever in R, D, 4, 3, or 2 (driving mode engaged)
Value "1" = Selector lever in P or N
Notes:

On vehicles without automatic transmission, "0" is always displayed.
Check gear recognition signal page 24
-99
.
Pa
ge 291 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

01-207
Note on display field 3: X
X
Meaning of the 2-digit display:

1 = A/C compressor off/on (0 = off; 1 = on)
Notes:

On vehicles without A/C "0" is always displayed.
Check A/C compressor page 24
-90
.
The A/C compressor is shut off for approx. 12 sec. by -J192- when accelerating from a stop and from low speed.
If the gas pedal is released sooner, the time is reduced to a minimum of 3 sec. At wide open throttle, the A/C
compressor is switched off by the automatic transmission (kick-down switch).

2 = Rear window heating - Signal (0 = off; 1 = on)
Notes:
The rear window heating signal is only displayed on vehicles without A/C.
On vehicles with A/C "0" is always displayed.
Check rear window heater signal page 24
-88
.
Notes on display field 4:

If the A/C compressor is off display field 3; display field 4 can be used to recognize whether the compressor was
switched off by the engine control module. Meaning of the 1-digit display:
Pa
ge 292 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

X
Meaning of 1-digit display

Value "0" = A/C compressor not switched off by engine control module
Value "1" = A/C compressor switched off by engine control module
Pa
ge 293 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

01-208
Display groups 024, 025 and 026
Notes:

Display group 024 is currently not assigned.
Display groups 025 and 026 are only used by Production.
Display shows
Values
Designation
Basic setting 24
1 2 3 4 -------- --------------------------------------
-------- --------------------------------------
-------- --------------------------------------
-------- -------------------------------------- Display shows
Values
Designation
Basic setting 25
1 2 3 4 0s --------------------------------------
0.0s --------------------------------------
0s --------------------------------------
0.0s -------------------------------------- Display shows
Values
Designation
Pa
ge 294 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

Basic setting 26
1 2 3 4 0 - 255 --------------------------------------
0 - 255 --------------------------------------
0 - 255 --------------------------------------
0 - 255 --------------------------------------
Pa
ge 295 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

01-209
Display group 027 Display
shows Display specified
value Designation/diagnosis
Basic setting
27
1 2 3 4 X 1 = Malfunction Indicator Lamp (MIL) wire from Transmission Control Module
(TCM)
X 2 = Fuel level signal from instrument cluster
0.000 V 3 = ---------------
0.000 V 4 = --------------- Notes on display field 1:

On vehicles with manual transmission, "1" is always displayed.
Checking Malfunction Indicator Lamp (MIL) wire from transmission control module page 24
-105
.
X
Meaning of the 1-digit display:

Value "0" = ignition on, engine not running
Value "1" = engine running Note on display field 2:

Check fuel level signal from instrument cluster page 24
-107
.
Pa
ge 296 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