Volkswagen Golf / Golf GTI / Jetta. Manual — part 335

01-6

Safety precautions

The ABS is a vehicle safety system; the

appropriate knowledge is necessary to work on
the system.

In order to check complaints and to be able to

carry out pin-pointed troubleshooting, the
Diagnostic Trouble Code (DTC) memory must
be checked before beginning work on the ABS
system.

Only separate connectors when the ignition is

switched off.

Observe the appropriate instructions regarding

the handling of brake fluid.

Repair Manual, Brake System, Repair Group

47

ABS malfunctions are indicated by the ABS

warning light illuminating. Certain malfunctions
will only be recognized at speeds above 20
km/h (approx. 13 mph) (carry out road test).

If the ABS Warning Light -K47- and the warning

light for brake system -K118- do not light up,
but the brake system is not functioning correctly
then the malfunction must be sought in the
conventional braking system.

Repair Manual, Brake System; Repair Group

45

ABS ITT Mark 20 IE On Board Diagnostic (OBD)

01-7

On Board Diagnostic (OBD) with V.A.G 1551 Scan Tool or Tester VAS
5051 (flow chart)

Connect V.A.G 1551 and select 1-

rapid datatransfer

or

Connect tester
VAS 5051 and

select vehicle

OBD

Compare control

module

identification

Select address word 03-Brake

electronics

Check DTC memory

02

Repair DTCs using DTC table

No DTCs

recognized

Read

measured

value block 08

Perform output Diagnostic

Test Mode (DTM) 03

Replace

component

1. Perform test drive at more
than 20 km/h

2. Check DTC memory 02 again

3. "No DTCs recognized" is

displayed again

A B C

D

E

ABS ITT Mark 20 IE On Board Diagnostic (OBD)

01-8

A B

C D

E

Perform directed

entry of electrical

tests

Service

hydraulic/mechanical

parts of brake system

(

Repair Manual)

1. Perform all test

steps of electrical
checks

Page 01-

102

Identification not OK.

2. Service

hydraulic/mechanical
parts of brake
system

(

Workshop

Manual)

Replace control module

- Connect V.A.G 1551 and check DTC memory again (02).

- Erase DTC memory (05)

- Perform test drive at more than 20 km/h (13 mph) and allow the ABS to
regulate braking.

- Check DTC memory again after test drive. If "No DTC recognized"
appears on display of V.A.G 1551 after repairing DTCs and performing
test drive the On Board Diagnostic (OBD) is completed.

ABS ITT Mark 20 IE On Board Diagnostic (OBD)

01-9

Electrical/electronic
components and
locations

Repair Manual, Brake

System, Repair Group 45

1 - ABS hydraulic unit

N55-

Located on left of

engine compartment.

The ABS hydraulic

pump -V64-
inlet/outlet valves in the
hydraulic unit are
checked by On Board
Diagnostic (OBD)

The ABS Hydraulic

Pump -V64
block must not be
separated from one
another

Removing and

installing:

When changing the

hydraulic unit, always
seal the old part with
the plugs from the
repair set Part No. 1H0
698 311 A

Electrical/electronic components and locations