1999 AUDI A4 sensor

24-97

Vehicle speed signal, checking


Note:
The vehicle speed signal originates from the
vehicle speed sensor (on the transmission) and
is routed to the instrument cluster as well as to
the Engine Control Module (ECM).

Speedometer in instrument cluster OK

Checking

- Using VAG 1551 scan tool, select "Read
Measuring Value Block" function 08, display
group 003 page 01
-249
.
Read measuring value block 3 1 2 3 4

Indicated on display
- Observe display field 4 while accelerating from standstill.
Specified values:

0 mph (at standstill)
Actual speed (vehicle driven)
-
Press button.
- Select "End Output" function 06.
- Press -Q- button to confirm input.
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11/22/2002 htt
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vehicle speed sensor, using wiring diagram.

If wiring is OK, replace vehicle speed sensor.
If voltage tester does not light up (become brighter) or flash, replace ECM
page 01
-265
. - Find and eliminate open circuit in wiring between terminal C13 and
vehicle speed sensor.
Pa
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
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24-104

Throttle position sensor output signal,
checking


Notes:

The Transmission Control Module (TCM)
interprets this information as a load signal.
This signal is monitored by the TCM.

Repair Manual, 5 Spd. Automatic
Transmission 01V, Repair Group 01; On Board Diagnostic


Checking requirement

Control module coding OK page 01
-247
.
Pa
ge 29 of 37 Auxiliar
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put si
gnals, checkin
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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pair&id=AUDI.B5.FU01.24.25

24-107

Fuel level signal (from instrument
cluster), checking


Notes:

If the fuel level in the tank is too low (less than
3.2 gal); combustion misfire, oxygen sensor and
fuel system malfunctions could occur. In these
cases the malfunction "Fuel tank level too low"
is stored in DTC memory.
The fuel tank level signal is monitored by the
Engine Control Module (ECM).

Checking requirements:
Control Module coding OK page 01
-247
.

Fuel content greater than 3.2 gal (12 liters).
Instrument cluster fuel gauge OK.
Pa
ge 32 of 37 Auxiliar
y in
put si
gnals, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.24.25