1999 AUDI A4 wiring

01-115

Output on printer of
VAG1551 Scan Tool
(ST) Possible cause
Corrective action
DTC
00644
Left front traction
control switch-over
valve -N168-
Open circuit, short circuit to B+ or Ground (GND)
in wiring between ABS hydraulic unit -N55- and
ABS control module -J104-.
Left front traction control switch-over valve -N168-
malfunctioning. - Carry out "electrical test", steps 5 +17
page 01
-68
.
- If the electrical test does not reveal any
malfunctions, check all wiring and
connectors for loose contacts.
- If no problems are found after
implementing the specified steps, replace
the control module.
00645
Left front traction
control outlet valve -
N169-
Open circuit, short circuit to B+ or Ground (GND)
in wiring between ABS hydraulic unit -N55- and
ABS control module -J104-.
Left front traction control outlet valve -N169-
malfunctioning. - Carry out "electrical test", steps 6 +17
page 01
-68
.
- If the electrical test does not reveal any
malfunctions, check all wiring and
connectors for loose contacts.
- If no problems are found after
implementing the specified steps, replace
the control module.
Pa
ge 74 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