wiring AUDI A4 1996 B5 / 1.G AFC Engine Auxiliary Input Signals Checking User Guide

24-102

Read measuring value block 4 1 2 3 4

Indicated on display; note display field 4
Notes:
Due to its short signal duration, shifting cannot always be observed on the
VAG 1551 scan tool.
CAUTION!
Do not use the shift inputs (identified by an X) during the shift signal
check.
If the change in the shift signal display did not occur, even though the
control module coding was OK: Specified value: XXX_X0
Shift value must increase briefly during shifting.
Specified value: XXX_X1
-
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.
Pa
ge 27 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

24-105

Malfunction Indicator Lamp (MIL) wire
from Transmission Control Module
(TCM), checking


Notes:

If a malfunction is recognized by the Engine
Control Module (ECM) or the Transmission
Control Module (TCM), it is indicated by the
Malfunction Indicator Lamp (MIL) in the
instrument cluster.
If the TCM recognizes a malfunction, the MIL is
switched on via the ECM.
The MIL wiring is monitored by the ECM.

Checking requirement
Control module coding OK page 01
-247
.
Pa
ge 30 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

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.
Pa
ge 31 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

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

Control module coding OK page 01
-247
.

Checking

- Switch ignition OFF.

- Connect VAG 1598/19 test box to ECM harness
connector page 01
-255
.

- Check signal wire for open or short circuit
between ECM and ABS control module, using
wiring diagram.
Pa
ge 35 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

24-110

- Find and eliminate open or short circuit; repair
as necessary.
If wiring is OK:

- Replace ABS control module.
If the ABS control module is OK, but the
malfunction is still occurring:

- Replace ECM page 01
-265
.

ABS control module with ABS/EDL/ASR

Notes:

The torque signal is monitored by the
"Automatic Traction Control" Control Module
and by the ECM.

Repair Manual, Brake System On Board
Diagnostic (OBD), Repair Group 01


Vehicles with automatic traction control (ASR)
can be recognized by the ASR indicator light in
the instrument cluster or by control module
identification displayed during the ABS On
Board Diagnostic program sequence.
Pa
ge 36 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