engine AUDI A4 1998 B5 / 1.G AFC Engine Auxiliary Input Signals Checking User Guide
Page 31 of 37
24-106
- Switch ignition ON.
- Using VAG 1551 scan tool, select "Read
Measuring Value Block" function 08, display
group 027, display field 1 page 01
-249
.
Read measuring value block 27 1 2 3 4
Indicated on display; note display field 1
If the specified value is not obtained, even though coding is OK: Specified value: 0
- Start engine and let idle.
Specified value: 1
-
Press button.- Select "End Output" function 06.
- Press -Q- button to confirm input.
- Connect VAG 1598/19 test box to ECM harness connector page 01
-
255
.
- Check wiring for open or short circuit between ECM and TCM, using
wiring diagram.
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11/22/2002 htt
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pair&id=AUDI.B5.FU01.24.25
Page 32 of 37
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
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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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Page 33 of 37
24-108
- Switch ignition ON.
- Using VAG 1551 scan tool, select "Read
Measuring Value Block" function 08, display
group 027, display field 2 page 01
-249
.
Read measuring value block 27 1 2 3 4
Indicated on display; note display field 2
If the specified value is not obtained, even though coding is OK: Specified value: 0
- Start engine and let idle.
Specified value: 1
-
Press button.- Select "End Output" function 06.
- Press -Q- button to confirm input.
- Connect VAG 1598/19 test box to ECM harness connector page 01
-
255
.
- Check wiring for open or short circuit between ECM and instrument
cluster, using wiring diagram.
Pa
ge 33 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
Page 34 of 37
24-109
Rough road condition signal, checking
ABS control module with ABS/EDL
Notes:
Misfires can result in malfunctions such as
"Combustion misfire" being recorded in DTC
memory due to road wheel malfunctions.
If the ABS control module recognizes a free
turning wheel, it generates a rough road signal.
If the Engine Control Module (ECM) recognizes
the rough road signal, misfire recognition is
switched off in the ECM.
The rough road signal is created to check
whether DTC 18014 "Rough Road Spec Engine
Torque ABS-SG Electrical Malfunction" is
stored in DTC memory. The "Combustion
misfire" malfunction results from this signal and
can be ignored.
The rough road signal is monitored by the
ECM.
Checking requirement
Pa
ge 34 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