1999 AUDI A4 ABS

01-63
Test table: display group 1
Notes:

Display fields 1 through 4 show the current wheel circumference speeds in km/h. These are calculated by the ABS control
module -J104- on the basis of the signals received from the wheel speed sensors. If one of the display fields shows no
reading, proceed as for DTCs 00283, 00285, 00287, 00290 "ABS Wheel Speed Sensor" DTC table page 01
-98
.
In order to check whether wheel speed sensors are properly allocated to each wheel, the vehicle must be raised. On
vehicles with manual transmission put the gear shift lever in neutral. On vehicles with automatic transmission move the
selector lever to position "N". Turn appropriate wheel by hand. Remaining drive wheels must be secured against turning.
When a vehicle is accelerated uniformly on a dry surface, the displayed value will increase continuously by whole
numbers; e.g. 6 km/h, 7 km/h, 8 km/h ... . The difference between displayed values 1 to 4 should not be more than 1
km/h (error from out-of-round wheels). If the values jump, for instance from ...6km/h, 7 km/h, to 12 km/h...or if the
difference between the displayed values is greater than 1 km/h, then check the installation of the wheel speed sensors
and rotors. Repair Manual, Suspension, Wheels, Steering, Repair Group 40

Repair Manual, Suspension, Wheels, Steering, Repair Group 42

Read measuring value block
1
Indicated on display
1 to 19
1)
km/h 1 to 19
1)
km/h
1 to 19
1)
km/h 1 to 19
1)
km/h


Rear right wheel circumference speed

Rear left wheel circumference speed
Pa
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g Value Block
(function 08
)
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Front right wheel circumference speed
Front left wheel circumference speed 1) On Board Diagnostic (OBD) is terminated by the ABS control module -J104- if road speed exceeds 19 km/h.
Pa
ge 4 of 79 Read Measurin
g Value Block
(function 08
)
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01-65
Test table: display group 2 Read measuring value block
2
Indicated on display
0 or 1
0 or 1

0 or 1
0 or 1



ABS solenoid valve relay:
For vehicles with Front Wheel Drive (FWD), the display shifts one field toward
left.
0 not permitted during "Read measuring value block", the relay was not
activated during "ignition on".
- Carry out "Electrical test", step 11 page 01
-68
.
1 specified value, relay was activated by ABS control module -J104- during
ignition on.

Voltage at motor for ABS return flow pump:
For vehicles with Front Wheel Drive (FWD), the display shifts one field toward left.

0 specified value, there is no voltage at the motor for the ABS return flow pump. 1 not permitted during "Read measuring value block", there is voltage at the motor for the
ABS return flow pump.
- Carry out "Electrical test", step 12 page 01
-68
.

Brake light switch: Additional signal only for
All Wheel Drive (AWD):
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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.
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g Value Block
(function 08
)
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yp
e=re
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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).
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g Value Block
(function 08
)
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01-69


Note:
The operation manual for the VAS1978 wiring harness repair kit generally
forbids the repair of any lines in the ABS or related systems. This rule only
pertains to the shielded lines in these systems.
Multi-pin harness connector for ABS control module -J104- in proper
condition, with no bent, broken or corroded terminals. Replace any
damaged terminals using VAS1978 wiring repair kit. Ignition and electrical consumers switched off before beginning
testing (headlights, lighting, fan, etc.). For steps 13 through 16, raise the vehicle until the wheels rotate
freely. On vehicles with manual transmission put the gear shift lever in
neutral. On vehicles with automatic transmission move the selector
lever to position "N".
Pa
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g Value Block
(function 08
)
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01-71

Connecting the VAG1598/20 test box and
checking the ABS, ABS/EDL or ASR system

- Switch ignition off.

- Remove ABS control module -J104-.

Repair manual, Brake System, Repair Group
45


- Disconnect multi-pin connector from ABS control
module -J104-.

- Check multi-pin connector between harness
connector and ABS control module -J104-.

The socket designations on the VAG1598/20 test box are identical to the
terminal designations on the ABS control module -J104- and on the wiring
harness connector.
Electrical Wiring Diagrams, Troubleshooting & Component Locations - Connect VAG1598/20 test box to multi-pin connector of ABS wiring
harness.
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g Value Block
(function 08
)
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01-72
Terminal assignment of multi-pin connector for wiring harness / ABS control module (w/EDL) -J104- Terminal
Wire connection to component ...
1
Voltage supply, terminal 15 2
Hydraulic unit; activation of ABS return flow pump relay -J105- 3
Hydraulic unit; left front traction control switch-over valve -N168- (secondary piston circuit) 4
Hydraulic unit; left front traction control outlet valve -N169- (secondary piston circuit) 5
Hydraulic unit; left front ABS inlet valve -N101- 6
Hydraulic unit; right rear ABS inlet valve -N133- 7
Hydraulic unit; activation of ABS return flow pump relay -J105- 9
Left front ABS wheel speed sensor -G47-
for vehicles with Front Wheel Drive (FWD) and ABS/EDLfor vehicles with Front Wheel Drive (FWD) and ABS/EDL/ASR
10
Left front ABS wheel speed sensor -G47- 11
Right rear ABS wheel speed sensor -G44- 12
Left rear ABS wheel speed sensor -G46- 13
Left rear ABS wheel speed sensor -G46- 14
Right front ABS wheel speed sensor -G45- 15
Right front ABS wheel speed sensor -G45-
for vehicles with Front Wheel Drive (FWD) and ABS
Pa
ge 15 of 79 Read Measurin
g Value Block
(function 08
)
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play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.SU02.01.8