1998 AUDI A4 diagram

01-113

Output on printer of
VAG1551 Scan Tool (ST) Possible cause
Corrective action
DTC
00623
ABS / transmission electrical
connection Manual transmission:

This malfunction only
occurs if vehicle is
equipped with ASR.
ABS/EDL/ASR control module -J104- incorrectly
coded. Short circuit to B+ at terminal 45
Electrical Wiring Diagrams,
Troubleshooting & Component
Locations - Check coding of
ABS/EDL/ASR control module -
J104- page 01
-56
.
- Locate and repair short circuit.

Automatic transmission:

Open circuit or short circuit to Ground (GND) in wiring
between ABS/EDL/ASR control module -J104- and
Transmission Control Module (TCM) -J217-. ABS/EDL/ASR control module -J104- incorrectly
coded.
Electrical Wiring Diagrams,
Troubleshooting & Component
Locations - Check coding of
ABS/EDL/ASR control module -
J104- page 01
-56
.
- Locate and repair open circuit
or short circuit.
Pa
ge 72 of 79 Read Measurin
g Value Block
(function 08
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.8

01-116

Output on printer of VAG1551 Scan
Tool (ST) Possible cause
Corrective action
DTC

00646
ABS-ASR motor electrical connection 1
Open circuit or short circuit to B+ or Ground
(GND) in wiring between ABS control module
-J104- terminal 18 and Engine Control
Module (ECM).
Electrical Wiring
Diagrams, Troubleshooting &
Component Locations - Locate and repair open
circuit or short circuit.
Note:
The following signals are sent from the
ABS control module (w/EDL) -J104- to the
Engine Control Module (ECM) via this
connection:

MMD signal (Masked Misfire
Diagnostic) for On Board Diagnostic
(OBD)
SET signal (Specified Engine Torque)




ABS control module -J104- malfunctioningEngine Control Module (ECM)
malfunctioning.



- Replace ABS control
module (w/EDL) -J104-.
- Replace Engine Control
Module (ECM).
Pa
ge 75 of 79 Read Measurin
g Value Block
(function 08
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.8

01-117

Output on printer of VAG1551 Scan
Tool (ST) Possible cause
Corrective action
DTC

00647
ABS-ASR motor electrical connection 2
Open circuit or short circuit to B+ or Ground
(GND) in wiring between ABS control module -
J104- terminal 47 and Engine Control Module
(ECM).
Electrical Wiring Diagrams,
Troubleshooting &
Component Locations - "Read measuring value
block", display group 3
page 01
-67
.
- Locate and repair open
circuit or short circuit.
Note:
The following signal is sent from the
Engine Control Module (ECM) to the
ABS control module (w/EDL) -J104- via
this connection:

AET signal (Actual Engine Torque)





Engine Control Module (ECM) malfunctioning.





- Replace Engine Control
Module (ECM).
Pa
ge 76 of 79 Read Measurin
g Value Block
(function 08
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.8

01-118

Output on printer of VAG1551 Scan Tool (ST)
Possible cause
Corrective action
DTC

00668
Vehicle voltage terminal 30, open circuit

When equipped with EDL, the ABS control module
-J104- requires this voltage supply after ignition is
switched off in order to calculate the drop in brake
temperature; page 01
-39
.
Voltage supply to ABS control
module (w/EDL) -J104- (terminal
50) has an open circuit or short
circuit to Ground (GND). Electrical Wiring
Diagrams, Troubleshooting
& Component Locations - Check wire connection.
Pa
ge 78 of 79 Read Measurin
g Value Block
(function 08
)
11/20/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.8