ECU VOLKSWAGEN JETTA 1998 Service Manual

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Safety precautions
Observe following if test and measuring
instruments are required during a test drive:

Test and measuring instruments must be
secured to rear seat and operated by a 2nd
person from this location.

When test and measuring instruments are
operated from the front passenger seat there is
a danger that the person sitting there could be
injured in an accident when the airbag is
triggered.
Стр. 42из 81 ABS ITT Mk 20 IE On Board Diagnostic (OBD) program

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Repair Manual,
Suspension, Wheels,
17 -
Right/left
front ABS
wheel speed
sensor -G45-/-
G47-

Checked by
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
make sure it
is not twisted
in the wheel
housing

Securing bolt
tightening
torque - 10
Nm (7.4 ft lb)
18 -
Wheel hub
with rotor for
speed
sensors

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

Removing
and installing
Стр. 14из 17 Electrical/electronic components and installing locations

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Repair Manual,
Suspension, Wheels,
Steering, Repair
Group 42; Servicing
19 -
Right/left rear
speed sensor
-G44-/-G46-

Checked by
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
make sure it
is not twisted
in the wheel
housing

Securing bolt
tightening
torque - 10
Nm (7.4 ft lb)
20 -
Wheel hub
with rotor for
speed
sensors

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

Removing
and installing
Стр. 16из 17 Electrical/electronic components and installing locations

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Access to the OBD is only possible when the
vehicle is stationary and ignition turned on
(or engine running).

Wheel bearings and wheel bearing play are
OK.

When checking the ABS system make sure
that the vehicle electric system is not
affected by electro-magnetic interference,
i.e. the vehicle is kept away from equipment
with a high current draw, e.g. from an electric
welding module.

Safety precautions

WARNING!

You must always secure testing and
measuring equipment on the rear seat.

When vehicle is being driven, a second
technician must operate this equipment.
Стр. 2из 129 On Board Diagnostic (OBD), performing

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Measured value block, reading

Note:
All functions that have been carried out so far
with V.A.G 1551 can now also be carried out with
the tester VAS 5051.
The control module can transfer a considerable
amount of test data. This test data delivers
information on the operational condition of the
system and/or sensors connected to it. In many
cases the transferred test data supports
troubleshooting and repair. The test data has
been summarized into single display groups
because all the information cannot be evaluated
at the same time. The information can be
selected via display group numbers.

Safety precautions

WARNING!

If the use of test and information devices
during a test drive is necessary, observe the
following:

You must always secure testing and
measuring equipment on the rear seat.

When vehicle is being driven, a second
technician must operate this equipment.
Стр. 82из 129 On Board Diagnostic (OBD), performing