1995 AUDI A4 engine

01-66

Note:
The display group numbers can be selected in
sequence by pressing buttons <-1 and 3-> on the
VAG1551 scan tool, or the arrow buttons and
on the VAG1552 mobile scan tool.
- Press -C- button to input display group number
manually. Read measurin
g value block
Enter displa
y group number XXX

Indicated on display:
Note:
For display group 3 (005):
To read the display fields for engine speed and current engine torque
with the engine running, communication between the scan tool and
the control module must be terminated via the "End Output" function
page 01
-16
. Start the engine and reinitiate communication
between the scan tool and the control module.
- Press buttons -0- and -8- to select "Read measuring value block"
function 08.
- Press -Q- button to confirm input.
- Press buttons -0-, -0- and -3-.
- Press -Q- button to confirm input.
Pa
ge 8 of 79 Read Measurin
g Value Block
(function 08
)
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01-67
Test table: display group 3 Read measuring value block
3
Indicated on display
60 to
8000
1 RPM 0 to
100
%
0 or 1
---


Traction control (ASR) button: (Only for vehicles equipped with ASR)

0 Traction control button not operated. 1 The traction control button is operated, operational condition of ASR alternates, i.e. "ASR
OFF" and "ASR ON". When ASR is switched off via the traction control button, the warning lamp for ASR lights up.
- Check traction control button if there are deviations. Carry out "Electrical test", step 22 page 01
-
68
.

Actual engine torque (AET): (Only for vehicles equipped with ASR)
0% vehicle is in deceleration mode.20% - 30% represents engine idle.100% engine is offering its maximum torque.
- If no indication is displayed, proceed according to DTC 00647 "ABS-ASR engine electrical connection 2". DTC
table page 01
-98
.
Engine speed: (Only for vehicles equipped with ASR)

Engine speed is displayed in increments of 60 RPM, starting at 60 RPM.
Pa
ge 9 of 79 Read Measurin
g Value Block
(function 08
)
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e=re
pair&id=AUDI.B5.SU02.01.8

01-68

Electrical testing


If the On Board Diagnostic (OBD) sequence
does not provide any indication of the source of
the malfunction, work through all of the
electrical test steps.
If the OBD sequence identifies the source of the
malfunction, only carry out the test steps
recommended in the DTC table (specific
testing).

Test requirements
The "Automatic Test Sequence" was carried
out and it was determined that the
Transmission Control Module (TCM) and
Engine Control Module (ECM) only contain
DTCs relating to ABS.

- Connect the VAG1551 Scan Tool (ST) and
select the address word 00 with ignition
switched on;

- After completing electrical test, check and
erase DTC memories of Transmission Control
Module (TCM) and Engine Control Module
(ECM).
Pa
ge 11 of 79 Read Measurin
g Value Block
(function 08
)
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e=re
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01-73

Terminal
Wire connection to component ...
18
Engine Control Module (ECM); MMD signal (Masked Misfire Diagnostic)
for vehicles with Front Wheel Drive (FWD) and ABS/EDL/ASR, the SET signal (Specified Engine Torque) is
also transmitted via this wiring harness.
19
Hydraulic unit; control wire for ABS return flow pump -V39- 20
Engine Control Module (ECM); Engine RPM
for vehicles with Front Wheel Drive (FWD) and ABS/EDL/ASR
25
Hydraulic unit; Left rear ABS outlet valve -N136- 26
Hydraulic unit; Right front ABS outlet valve -N100- 27
Hydraulic unit; right front traction control outlet valve -N167- (primary piston circuit) 28
Ground (GND) terminal 31 (ABS control module -J104-) 29
Ground (GND) terminal 31 (ABS control module -J104-) 31
Instrument cluster; activation of traction control indicator light
for vehicles with Front Wheel Drive (FWD) and ABS/EDL/ASR
32
Instrument cluster; ABS/EDL warning light activation (active) 33
Hydraulic unit; Left front ABS outlet valve -N102- 34
Hydraulic unit; Right rear ABS outlet valve -N135- 35
Left front ABS wheel speed sensor -G47-
for vehicles with All Wheel Drive (AWD) and ABS/EDL
Pa
ge 17 of 79 Read Measurin
g Value Block
(function 08
)
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play?action=Goto&t
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e=re
pair&id=AUDI.B5.SU02.01.8

01-74

Terminal
Wire connection to component ...
37
Hydraulic unit; activation of ABS solenoid valve relay -J106- 38
Right rear ABS wheel speed sensor -G44- 42
Right front ABS wheel speed sensor -G45-
for vehicles with Front Wheel Drive (FWD) and ABS/EDL/ASR for vehicles with All Wheel Drive (AWD) and ABS/EDL (throttle valve regulation)
44
Traction control (ASR) button
for vehicles with Front Wheel Drive (FWD) and ABS/EDL/ASR
45
TI (Transmission Influence)
for vehicles with Front Wheel Drive (FWD) and ABS/EDL/ASR
46
K-wire 47
Engine Control Module (ECM); AET (Actual Engine Torque)
for vehicles with Front Wheel Drive (FWD) and ABS/EDL/ASR
47
Brake light switch -F-
for vehicles with All Wheel Drive (AWD) and ABS/EDL
48
Brake light switch -F- 50
Battery + (terminal 30) 53
Hydraulic unit; left rear ABS inlet valve -N134-
Pa
ge 19 of 79 Read Measurin
g Value Block
(function 08
)
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yp
e=re
pair&id=AUDI.B5.SU02.01.8

01-110

Output on printer of
VAG1551 Scan Tool
(ST) Possible cause
Corrective action
DTC
00529
Wheel speed information
missing
No signal

This malfunction only
occurs if vehicle is
equipped with ASR.
Open circuit or short circuit to B+ or
Ground (GND) in wiring between ABS
control module -J104- 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.


Engine Control Module (ECM)
malfunctioning. - If the tachometer in the instrument cluster is
malfunctioning and no malfunctions can be found in
the wiring, the Engine Control Module (ECM) is
malfunctioning and must be replaced.

ABS control module -J104-
malfunctioning - If the tachometer in the instrument cluster
functions properly and no malfunctions can be
found in the wiring, the ABS control module
(w/EDL) -J104- is malfunctioning and must be
replaced.
Pa
ge 69 of 79 Read Measurin
g Value Block
(function 08
)
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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
)
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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
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play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.8