sensor VOLKSWAGEN BORA 1998 Service Manual

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ABS ITT Mark 20 IE On Board
Diagnostic (OBD)
Function
Since the control modules are interconnected
with CAN-bus, always begin OBD by checking
the Diagnostic Trouble Code (DTC) memories
of all the control modules in the vehicle.
This occurs in the Automatic test sequence and
is activated with key function 00.
When doing this, check to see if there are
DTCs stored which may influence the ABS.
On Board Diagnostic (OBD) relates to the
electrical/electronic part of the ABS, i.e. only
malfunctions via the electrical connection to the
control module are recognized (e.g. speed
sensor open circuit).
The 25-pin ABS Control Module (w/EDL) -J104-
forms with the hydraulic unit a compact unit.
The unit is located on the left in the engine
compartment. The control module is equipped
with a DTC memory. The diagnostic connection
is located in the center console below the
heating/air conditioning controls.
The control module recognizes malfunctions
during vehicle operation and stores them in a
permanent memory, the contents of which
remain even during periods of no battery
voltage.
Стр. 1из 8 ABS ITT Mark 20 IE On Board Diagnostic (OBD)

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Sporadic (isolated) malfunctions will also be
recognized and stored. But if these malfunctions
do not occur again within the next 50 vehicle
starts and driving off sequences then, with the
exception of "control module inoperative", the
DTC memory will be erased.
After switching on the ignition and/or starting the
engine the ABS warning light -K47- and the
warning light for brake system -K118- light up for
approx. 2 seconds.
During this period a test sequence (self-check) is
run in the control module for the following
functions:

To check if the supply voltage is at least 10.0
Volt

To check control module including the valve
windings

To check the coding of the control module

A static check of the speed sensor (no speed
signal)

If after driving off and exceeding a speed of
approx. 20 km/h (approx. 13 mph) the speed
signal is not OK. The ABS warning light -K47-
will light up again.
Стр. 2из 8 ABS ITT Mark 20 IE On Board Diagnostic (OBD)

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5 -
Brake light
switch -F-

The brake
light switch is
open in the
rest position;

Adjusting
Page 01
-131
Can be
checked via
read
measured
value block
Page 01
-
61
6 -
Data Link
Connector
(DLC)

Installation
position: in
center
console
below
heating/air
conditioning
controls
7 -
Longitudinal
acceleration
sensor -G251-

All-wheel
drive
vehicles with
Haldex
coupling only
Стр. 5из 14 Electrical/electronic components and locations

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11 -
Right/left
front ABS
wheel speed
sensor -G45-/-
G47-

Checked by
On Board
Diagnostic
(OBD)

Before
inserting the
sensor clean
the inner
surface of
the sensor
mounting
and coat with
lubricating
paste G 000
650

When
connecting
the speed
sensor wire
ensure it is
not twisted in
the wheel
housing

Bolt
tightening
torque - 10
Nm
12 -
Wheel hub
with impulse
rotor for
right/left front
speed
sensors

Rotor and
speed
sensors for
front left and
right-hand
sides are
identical
Стр. 7из 14 Electrical/electronic components and locations

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13 -
Right/left rear
ABS wheel
speed sensor
-G44-/-G46-

Checked by
On Board
Diagnostic
(OBD)

Before
inserting the
sensor clean
the inner
surface of
the sensor
mounting
and coat with
lubricating
paste G 000
650

When
connecting
the speed
sensor wire
ensure it is
not twisted in
the wheel
housing

Bolt
tightening
torque - 10
Nm
14 -
Wheel hub
with impulse
rotor for
right/left rear
speed
sensors

Rotor and
speed
sensors for
left and right-
hand sides
are identical

Removing
and installing
Стр. 9из 14 Electrical/electronic components and locations

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ABS warning light -K47-

Electrical Wiring Diagrams,
Troubleshooting & Component Locations
binder
If the ABS warning light -K47- (-2-) does
not go out after switching ignition on and
completion of test sequence then the
malfunction may be:
-a- Voltage supply is below 10 Volts
-b- There is a malfunction in the ABS
The anti-locking brake system remains
switched off with an ABS malfunction -b-,
but the brake system remains fully
operational.
-c- Since the last time the vehicle was
started there was a temporary speed
sensor malfunction.
In the case of a sensor malfunction -c-,
the ABS warning light -K47- will
extinguish after restarting the engine and
attaining a speed of above 20 km/h
(approx. 13 mph).
-d- The connection from instrument cluster
to ABS control module (w/EDL) -J104- is
interrupted.
-e- Instrument cluster is faulty.
Стр. 12из 14 Electrical/electronic components and locations

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01-37


V.A.G 1551
print-out Possible cause

Repair
00283
Left front
ABS wheel
speed
sensor -
G47-
Open circuit, shor
t to positive or
Ground, or loose contact in
connections betwe en left front ABS
wheel speed sens or -G47- and
ABS Control Mo dule (w/EDL) -
J104- - Check wiring and
connections using
wiring diagram
- Perform electrical checks from
Page 01
-102
Damaged rotor or left front ABS
wheel speed sensor -G47

Left front ABS whee l speed sensor
windings -G47- faulty - Check left front
ABS wheel speed
sensor -G47- and rotor for damage
- Replace rotor/speed sensor -G47-
Repair Manual, Brake System,
Repair Group 45; Removing and
installing parts of ABS system on front
and rear axles
If the malfuncti on occurs again:

ABS Control Module (w/EDL) -
J104- faulty
Repair Manual, Brake System,
Repair Group 45; Hydraulic unit, brake
booster/brake master cylinder -
Assembly overview; Removing and
installing control mo dule and hydraulic
unit
- Replace ABS Control Module
(w/EDL) -J104-
Стр. 17
из 81
ABS ITT Mk 20 IE On Board Diagnostic (OBD) program
Volkswagen Technical Site: http://v olkswagen.msk.ru http://vwts.info http://vwts.ru
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V.A.G 1551
print-out Possible cause
Repair
00283
Left front ABS
wheel speed
sensor -G47-
Signal outside
tolerances
1)
Open circuit, short to positive or
Ground, or loose contact in
connections between left front ABS
wheel speed sensor -G47- and ABS
Control Module (w/EDL) -J104- - Check wiring and
connections using wiring
diagram
- Perform electrical checks
from Page 01
-102

Electrical interference from other
sources (high frequency radiation e.g.
non-insulated ignition cable) - Read measured value block
Page 01
-61 Display group
number 001

Damaged rotor or left front ABS wheel
speed sensor -G47-


Excessive air gap between left front
ABS wheel speed sensor-G47- and
rotor (signal not OK.)
Repair Manual, Brake
System, Repair Group 45;
Removing and installing parts
of ABS system on front and
rear axles - Check left front ABS wheel
speed sensor -G47- and rotor
for damage
- Replace rotor/speed sensor
1) Type of DTC, this DTC is only recognized above 20 km/h (13 mph) (carry out test drive).
Стр. 18из 81 ABS ITT Mk 20 IE On Board Diagnostic (OBD) program

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V.A.G 1551 print-
out Possible cause
Repair
00283
Left front ABS
wheel speed
sensor -G47-
Mechanical
malfunction
1)
Excessive air gap
between left front ABS
wheel speed sensor -
G47- and rotor (signal
not OK.) Repair Manual, Brake System, Repair
Group 45; Removing and installing parts of
ABS system on front and rear axles - Check installation of left front ABS wheel
speed sensor -G47- and rotor
- Read measured value block Page 01-
61 Display group number 002
- Perform output Diagnostic Test Mode
(DTM) Page 01
-74
If the malfunction occurs again:

Outlet valve in ABS
hydraulic unit -N55-
faulty Repair Manual, Brake System, Repair
Group 45; Hydraulic unit, brake
booster/brake master cylinder - Assembly
overview; Removing and installing control
module and hydraulic unit - Replace ABS hydraulic unit -N55-
1) Type of DTC, this DTC is only recognized above 20 km/h (13 mph) (carry out test drive).
Стр. 19из 81 ABS ITT Mk 20 IE On Board Diagnostic (OBD) program

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V.A.G 1551
print-out Possible cause
Repair
00285
Right front
ABS wheel
speed
sensor -
G45-
Open circuit, short to positive or
Ground, or loose contact in
connections between right front
ABS wheel speed sensor -G45-
and ABS Control Module (w/EDL) -
J104- - Check wiring and connections using
wiring diagram
- Perform electrical checks from
Page 01
-102

Damaged rotor or speed sensor -
G45

Speed sensor windings -G45-
faulty
Repair Manual, Brake System,
Repair Group 45; Removing and
installing parts of ABS system on front
and rear axles - Check right front ABS wheel speed
sensor -G45- and rotor for damage
- Replace rotor/right front ABS wheel
speed sensor -G45-
If the malfunction occurs again:


ABS Control Module (w/EDL) -
J104- faulty
Repair Manual, Brake System,
Repair Group 45; Hydraulic unit, brake
booster/brake master cylinder -
Assembly overview; Removing and
installing control module and hydraulic
unit - Replace ABS Control Module
(w/EDL) -J104-
Стр. 20из 81 ABS ITT Mk 20 IE On Board Diagnostic (OBD) program