Volkswagen Golf / Golf GTI / Jetta. Manual — part 363

01-134

Function

As the control modules are interconnected

with a data bus wire, always start
troubleshooting by the Diagnostic Trouble
Code (DTC) memories of all the control
modules in the vehicle.

This occurs in "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.

The On Board Diagnostic (OBD) relates to

the electrical/electronic part of the ABS, in
other words only malfunctions via the
electrical connection to the control module
are recognized (e.g. speed sensor open
circuit).

The 47 pin ABS Control Module (w/EDL) -

J104- forms with the hydraulic unit a
compact unit. The unit is located on the left
of the engine compartment. The control
module is equipped with a DTC memory.
The Data Link Connector (DLC) 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.

ABS Mark 60 On Board Diagnostic (OBD), vehicles from my 10.00

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Sporadic (irregular) malfunctions will also be

recognized and stored. But if malfunctions
affecting the data bus system do not occur again
within the next 15 vehicle start and driving off
sequences, or other malfunctions within the next
50 vehicle start and driving off sequences, they
will be erased from DTC memory except for the
malfunction "Control module faulty" (forget-
malfunction counter).

After switching on the ignition and/or starting the

engine, the ABS warning light -K47- and the ESP
control lamp -K155- will 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 the wheel speed signal is not OK after the car

has been driven and a speed of approx. 20
km/h (approx. 13 mph) has been exceeded, the
ABS warning light -K47- will light up again.

ABS Mark 60 On Board Diagnostic (OBD), vehicles from my 10.00

01-136

Features of 4MOTION

In order to utilize the engine's maximum

performance for a test, e.g. on a rolling road
test bed, the longitudinal acceleration sensor
-G251- must be switched off

Page 01-

264

, Initiating basic setting, Display group

number 040.

Switch ignition off and on again to reactivate

the longitudinal acceleration sensor -G251-.

All-wheel drive vehicles with a Haldex

coupling are equipped with EDL (Electronic
Differential Lock).

Special detail for bleeding brake systems

with ABS/EDL

If a chamber in the brake fluid reservoir has

run empty, basic setting must be performed
for bleeding the brakes

Page 01-264

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V.A.G 1551 scan tool or tester VAS 5051

The On Board Diagnostic must be initiated

at the commencement of troubleshooting.
Electrical malfunctions which influence the
braking characteristics will be stored.

They can be checked with the V.A.G 1551

Scan Tool, Vehicles system tester V.A.G
1552 or Vehicle Diagnosis, Testing and
Information System VAS 5051.

The program card in the V.A.G 1551 must

be at least version 9.0 and in vehicle system
tester V.A.G 1552, at least version 6.0.

ABS Mark 60 On Board Diagnostic (OBD), vehicles from my 10.00

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Arrangement of ABS MARK 60

The brake booster boost is produced
by vacuum pressure.

Distinguishing features:

1 -

10" brake booster

2 -

Hydraulic unit

3 -

Control module, 47-pin (bolted
to hydraulic unit). Two 4.8 mm
wide contacts are located at
each end of the connection.

ABS Mark 60 On Board Diagnostic (OBD), vehicles from my 10.00