engine coolant AUDI A4 1995 B5 / 1.G Instrument Cluster OBD From Model Year 2000 Workshop Manual

01-93
Diagnostic Trouble Code (DTC) table for instrument cluster

Notes:

The following table lists all malfunctions that can be recognized by the instrument cluster and printed out by the VAG1551
scan tool. The malfunctions are listed in order according to their 5-digit numbers.
DTC numbers appear only on the print-out.
Before replacing a component shown as faulty, check the wiring and connections to the component as well as the Ground
(GND) connections according to wiring diagram.
After repairs and function test of the system, DTC memory must always be checked again using the VAG1551 scan tool
and erased.
DTC memory stores all static and sporadic malfunctions: If a malfunction occurs and persists for at least 2 seconds, it is
identified as a static malfunction (outside temperature malfunction at least 60 seconds, coolant temperature sensor only
after at least 30 minutes with engine running). If a malfunction does not occur again, it is registered as sporadic. "/SP" will
appear at right on scan tool display.
When the ignition is switched on, all existing malfunctions are automatically re-classified as sporadic malfunctions and will
only register as static malfunctions if they still occur after testing.
Sporadic malfunctions which no longer occur during 50 driving cycles (ignition on at least 5 minutes, vehicle speed 30
km/h) are erased automatically.
Pa
ge 17 of 99 Instrument cluster with lon
g service life, On Board Dia
gnostic
(OBD
) (from m.
y. 2000
)
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01-95

VAG 1551 scan tool
display Possible causes
Corrective action
00771
Sender for fuel gauge -G-

Open circuit/short
circuit to B+
Short circuit to Ground
Open circuit or short circuit between sender for fuel
gauge -G- (Front Wheel Drive/All Wheel Drive) and
instrument cluster
Sender for fuel gauge -G- (Front Wheel Drive/All
Wheel Drive) is faulty - Locate malfunction using wiring
diagram
- Repair open circuit
- - Replace Sender for fuel gauge -
G- (Front Wheel Drive/All Wheel
Drive)
00779
Outside air temperature
sensor -G17-

Open circuit/short
circuit to B+
Short circuit to Ground
Open circuit or short circuit
Outside air temperature sensor -G17- faulty - Locate malfunction using wiring
diagram
- Repair open circuit
- Replace outside air temperature
sensor -G17-
01039
Engine Coolant
Temperature (ECT) sensor
-G2-

Open circuit/short
circuit to B+
Short circuit to Ground
Open circuit or short circuit between Engine Coolant
Temperature (ECT) sensor -G2- and instrument
cluster
Engine Coolant Temperature (ECT) sensor -G2-
faulty - Locate malfunction using wiring
diagram
- Repair open circuit
- Replace Engine Coolant
Temperature (ECT) sensor -G2-
Pa
ge 20 of 99 Instrument cluster with lon
g service life, On Board Dia
gnostic
(OBD
) (from m.
y. 2000
)
11/20/2002 htt
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play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.EE01.01.2

01-101

Output Diagnostic Test Mode (scan tool
function 03)


Notes:

Output Diagnostic Test Mode is only possible
when vehicle is stationary and engine is not
running!
If malfunctions are found during output
Diagnostic Test Mode, determine cause of
malfunction and replace instrument cluster if
necessary.

During the "output Diagnostic Test Mode"
function, all actuators that are installed in the
instrument cluster and coded are activated in
sequence.
There is also a simultaneous parallel sweep
through the indicator range of all analog display
instruments (Engine Coolant Temperature
(ECT) gauge, tachometer, speedometer, fuel
gauge)
Activation of warning lamps
Activation of seat belt warning light

Pa
ge 27 of 99 Instrument cluster with lon
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01-103
The following tests are performed
simultaneously:

Sweep of coolant temperature needle through
entire display range
Sweep of tachometer needle through entire
display range
Sweep of speedometer needle through entire
display range
Sweep of fuel gauge needle through entire
display range
After sweep of display ranges, the following fixed
values are displayed:

Engine Coolant Temperature (ECT)
gauge:
1/2
Tachometer: 3000 RPM

Speedometer: 62 MPH
Fuel gauge:
1/2

Note:
Switching ignition on and off will stop any needle
Pa
ge 30 of 99 Instrument cluster with lon
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01-115

Display group overview:

Display group
number Indicated on display
001 1 = Speed
2 = Engine RPM
3 = Oil pressure switch
4 = Time
002 1 = Trip odometer
2 = Fuel gauge
3 = Tank sensor
4 = Outside air
temperature
003 1 = Coolant temperature
010 1 = Channel 30
2 = Adaptation tank
sensor
3 = Channel 9
4 = Trip odometer
011 1 = Channel 4
Pa
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01-117

Display group
number Indicated on display
050 1 = Trip odometer
2 = Engine RPM
3 = Oil temperature
4 = Coolant temperature
125 1 = Engine
2 = Transmission
3 = ABS
4 = ADR
126 1 = A/C
130 1 = Tire pressure
2 = Auxiliary heater
3 = Unassigned
4 = Parking assistance
140 1 = Radio
2 = Telephone
3 = Navigation
Pa
ge 48 of 99 Instrument cluster with lon
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01-118

Notes:

For an instrument cluster replacement, data
from display groups 10...15 must be printed out.
Measuring value blocks 125 and 126 indicate
the participants in the powertrain data-BUS.
Measuring value block 130 indicates the
participants in the comfort system databus.
Measuring value block 140 indicates the
participants in the information data-BUS
Display will always indicate the actual values
obtained from the sensors. The values which
appear on the instrument cluster are filtered
and may be different.
If the actual engine coolant temperature is
between 80 C and 100 C, instrument cluster
will always show 90 C.
Pa
ge 50 of 99 Instrument cluster with lon
g service life, On Board Dia
gnostic
(OBD
) (from m.
y. 2000
)
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e=re
pair&id=AUDI.B5.EE01.01.2

01-128
Measuring value block 50

Read Measuring Value Block 50

Indicated on display:

6256 mi 2400 RPM
99 C
85.0 C



Coolant temperature
50 - 130 C




Oil temperature

Engine speed (RPM)

0 - 9990 RPM


Display value of trip odometer

Pa
ge 60 of 99 Instrument cluster with lon
g service life, On Board Dia
gnostic
(OBD
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y. 2000
)
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yp
e=re
pair&id=AUDI.B5.EE01.01.2