Volkswagen Golf / Golf GTI / Jetta. Manual — part 1022

01-4

VAG- On Board Diagnostic

HELP

1 - Rapid data transfer*

2 - Blink code output*

Indicated on display (* is displayed

alternately):

- Press button 1 for "Rapid data

transfer".

- Continue On Board Diagnostic

(OBD) of vehicle system to be
tested as described under
"performing On Board Diagnostic
(OBD)

table of contents

On Board Diagnostic (OBD) through m.y. 2001

13/2/2005

01-5

On Board Diagnostic (OBD)
from m.y. 2002

General information

OBD program text/data generated by control

modules installed on vehicles from m.y.
2002 may not be recognized by VAG
1551/1552 Scan Tools (ST) with the latest
program card. For example: scan tool
display shows "text 799",
"01529 /references" or similar.

Only the VAS 5051 Vehicle Diagnostic

Testing and Information System is capable
of processing all display text/data on these
vehicles.

All OBD program functions on vehicles

from m.y. 2002 should be performed
using the VAS 5051 Vehicle Diagnostic
Testing and Information System in
operating mode "Guided Fault Finding"
or "Vehicle Self-Diagonsis".

On Board Diagnostic (OBD) from m.y. 2002

13/2/2005

01-6

Instrument cluster through
m.y. 1999, On Board
Diagnostic (OBD)

General information

The instrument cluster contains an electronic

speedometer, tachometer, liquid crystal
(LCD) displays for odometer, trip
odometer/clock, as well as analog coolant
temperature and fuel level gauges. Control
and warning lamps are situated within and
between the speedometer and tachometer.
Automatic transmission models also contain
an LCD gear indicator display.

Where available, an LCD multi-function trip

computer (MFI) with two operating modes is
located in the tachometer display. The MFI
includes selectable displays for trip
time/mileage, average trip speed, average
trip fuel consumption and outside
temperature.

The instrument cluster is controlled by an

internal microprocessor with On Board
Diagnostic (OBD) capability. If malfunctions
occur in monitored sensors and
components, Diagnostic Trouble Codes
(DTC) will be stored in memory together with
an indication of malfunction type. A
maximum of 4 DTCs can be stored
simultaneously.

Sporadic malfunctions (indicated in the

readout by "SP") are automatically cancelled
if not repeated in the next 50 engine starts.

Before performing any troubleshooting or

inspection, always begin by checking for
DTCs using the OBD program. DTCs stored
in memory are retrieved/checked with either
the VAG 1551/1552 Scan Tool (ST) or VAS
5051 Vehicle Diagnostic Testing and
Information System.

Instrument cluster through m.y. 1999, On Board Diagnostic (OBD)

13/2/2005

01-7

Notes on exchanging instrument cluster

Do not disassemble instrument cluster.

Instrument clusters contain no field serviceable

components. All malfunctions require
replacement of instrument cluster.

When the replacement of a malfunctioning

instrument cluster is necessary, follow
exchange part procedures.

Complete the report form and return together

with instrument cluster.

Use the original packaging from the new cluster

when returning modules.

Replacement instrument clusters must be

coded according to vehicle market version and
equipment level variables using the OBD
program

Page 01-29

.

Odometer reading must be adapted to the

new/exchange instrument cluster using the
OBD program

Page 01-45

.

Additional information:

Complaint/symptom based Technical Bulletins

("Service Fixes"):

Technical Bulletins

Instrument cluster

Repair Manual, Electrical

Equipment, Repair Group 90

.

Instrument cluster through m.y. 1999, On Board Diagnostic (OBD)

13/2/2005