engine AUDI A4 1999 B5 / 1.G Instrument Cluster OBD From Model Year 1999 Workshop Manual

01-1


Instrument cluster, On Board
Diagnostic (OBD) (through
M.Y. 1999)

General information


Instrument cluster technology
The Audi A4 instrument cluster is available in two
versions; the low-line version with "mini-check"
system and the high-line version with an LCD
multi-function display.
The mini-check system monitors the brake
system, Engine Coolant Temperature (ECT), fuel
level and engine oil pressure.
The multi-function display contains the following
functions:

Auto check system with radio station and
telephone displays
Ambient outside temperature display
On-board computer display
Transmission Range (TR) selector lever display
for automatic transmission
Pa
ge 1 of 74 Instrument cluster, On Board Dia
gnostic
(OBD
) (throu
gh M.Y. 1999
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE01.01.1

01-12
Diagnostic Trouble Code (DTC) table for instrument cluster

Notes:

The following table lists all possible Diagnostic Trouble Codes (DTCs) which the instrument cluster can recognize and
which the VAG1551 scan tool can print.
DTC numbers only appear on the printout.
Before replacing any component shown as malfunctioning, check all related wiring and connections of these components
and the Ground (GND) connections Electrical Wiring Diagrams Troubleshooting & Component Locations After the repair has been carried out and the functional system check, re-check and erase the DTC memory using the
VAG1551 scan tool.
The DTC memory records all static and sporadic (intermittent) malfunctions. A malfunction is considered static if it exists
for at least 2 seconds (exceptions: 60 seconds for outside temperature display and 30 minutes, for engine coolant sensor).
If the malfunction is not present after this time, it will be stored as a sporadic DTC and "/SP" will appear on the right side of
the scan tool display.
After switching the ignition on, all existing DTCs are set to sporadic. If they are still present after the system check, they
will be stored as static DTCs.
If a sporadic malfunction does not reoccur within 50 driving cycles (ignition on for at least 5 minutes and vehicle speed
greater than 30 km/h or 18 mph), it will be erased.
Pa
ge 14 of 74 Instrument cluster, On Board Dia
gnostic
(OBD
) (throu
gh M.Y. 1999
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE01.01.1

01-14

01039
ECT Sensor-G2

Open/Short
circuit to B+
Short circuit to
Ground (GND)
Open circuit or short circuit between Engine Coolant
Temperature Sensor (ECT) -G2- and instrument
cluster
ECT sensor -G2- faulty- Trace malfunction Electrical Wiring
Diagrams, Troubleshooting & Component
Locations
- Replace -G2-.
01402
Data Wire from
Navigation

Incorrect signal
Open circuit in clock enable or data wire
Navigation/instrument cluster interface
malfunctioning
Malfunction caused by electromagnetic interference
inside and outside vehicle Repair Manual Radio, Telephone,
Navigation, Repair Group 97 - Check data wire for damage.
- Check causes for electromagnetic
malfunctions.
65535
Control Module
Malfunctioning
Instrument cluster faulty- Replace instrument cluster Page 90
-
1 .
Pa
ge 17 of 74 Instrument cluster, On Board Dia
gnostic
(OBD
) (throu
gh M.Y. 1999
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE01.01.1

01-15

Output Diagnostic Test Mode (scan tool
function 03)


Notes:

Output Diagnostic Test Mode may only be
carried out on a stationary vehicle with the
engine off.
Trace any faults identified by the Output
Diagnostic Test Mode, replace the instrument
cluster if necessary.

The function "Output Diagnostic Test Mode"
cycles all the control elements in the
instrument cluster sequentially, if they are
installed and coded.
Concurrent testing of the display ranges of all
the analog indicators (coolant temperature
gauge, tachometer, speedometer and fuel
gauge).
Activation of the mini-check indicator lights.
Activation of the seat belt warning lamp.
Activation of the chime.
Pa
ge 18 of 74 Instrument cluster, On Board Dia
gnostic
(OBD
) (throu
gh M.Y. 1999
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE01.01.1

01-23

Code Control Module (scan tool function
07)

This function is used to code the instrument
cluster with the following information:
Optional equipment
Country specific variations (market versions)
Number of cylinders
Engine versions

Notes:
Coding sets the various combinations of the on
board computer and check package according
to the optional equipment, country specific
variations, number of cylinders and engine
version.
The coding table only contains coding
combinations for the Audi A4.

Initiating instrument cluster coding
Rapid data transfer
HELP
Select function XX

Indicated on display
Pa
ge 29 of 74 Instrument cluster, On Board Dia
gnostic
(OBD
) (throu
gh M.Y. 1999
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE01.01.1

01-24

Code control module
Q
Input code number XXXXX (0-32000)

Indicated on display
- Input code number using Coding table Page 01
-25
. Example:
00262
00 no optional equipment
2 Country: USA
6 6-cylinders
2 Gasoline engine
Code Control Module
Q
Input code number 00262 (0-32000)

- Indicated on display (example).
- Press -Q- button to confirm input
8D0919930L B5-INSTRCLUST VDO X16Codin
g 00262
WSC 06812

Indicated on display
-
Press button to end coding process.
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -6-.
Rapid data transfer
Q
06 - End Output

Indicated on display
- Press -Q- button to confirm input
Pa
ge 31 of 74 Instrument cluster, On Board Dia
gnostic
(OBD
) (throu
gh M.Y. 1999
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE01.01.1

X Number of cylinders
4
6 4-cylinders
6-cylinders
X Engine versions
0
2 TDI engine
Gasoline engines, 4 and 6
cylinder
Pa
ge 33 of 74 Instrument cluster, On Board Dia
gnostic
(OBD
) (throu
gh M.Y. 1999
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE01.01.1

01-28

Display group overview

Display
group Indicated on display
001 1 = Vehicle speed (kmh/MPH)
2 = Engine speed (RPM)
3 = Oil pressure switch 2 < min
002 1 = Odometer (km/mi)
2 = Fuel gauge (liters/gal)
3 = Outside temperature ( C/F) 003 1 = Engine coolant temperature (
C/F) 050 1 = Odometer (km/mi)
2 = Engine speed (RPM)
4 = Engine coolant temperature (
C/F)

Notes:

The display will always show the actual values
from the sensors. Since the instrument panel
displays filters the values, they may differ from
the actual values.
Pa
ge 36 of 74 Instrument cluster, On Board Dia
gnostic
(OBD
) (throu
gh M.Y. 1999
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE01.01.1

If the actual Engine Coolant Temperature (ECT)
is between 80 C (176 F) and 100 C (212 F),
the instrument panel will always display 90 C
(194 F).

Additional display groups for the instrument
cluster are not possible.
Pa
ge 37 of 74 Instrument cluster, On Board Dia
gnostic
(OBD
) (throu
gh M.Y. 1999
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE01.01.1

01-29
Display group 001

Read Measuring Value Block 1

Indicated on display

50 km/h 2400 RPM Oil press 2

Time
Not activated for Audi A4



Oil pressure switch 2
Oil pressure switch 2 < min Oil pressure switch 2 OK.

Engine RPM

0 - 9990 RPM


Road speed
0 - 300 km/h

Pa
ge 38 of 74 Instrument cluster, On Board Dia
gnostic
(OBD
) (throu
gh M.Y. 1999
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE01.01.1