Volkswagen Golf / Golf GTI / Jetta. Manual — part 110

01-21

Indicated on display:

Select operating mode:

- Press button on screen for

"Vehicle self-diagnosis".

Indicated on display:

Select vehicle system:

- Press button "01 - Engine

electronics" on screen.

On Board Diagnostic (OBD)

01-22

The control module identification and

coding are shown on the display,
e.g.:

If the coding differs from the vehicle
version, then:

- Check control module coding

Page 24-177

, Coding Motronic

Engine Control Module (ECM) -
J220-.

Indicated on display:

Select diagnostic function:

At this point all diagnostic functions
are available.

- Press desired function on the

display.

- See repair procedures for further

measures.

On Board Diagnostic (OBD)

01-23

DTC memory

Check DTC memory of all control
modules

Page 01-27

, Automatic

test sequence.

DTC memory, checking and
erasing

Special tools, workshop
equipment, testers, measuring
instruments and auxiliary items
required

Note:

All functions which could previously
be performed with VAG 1551/1552
can also be performed with VAS
5051.

Test prerequisites

VAG 1551 scan tool (or VAG

1552 vehicle system tester) with
VAG 1551/3 adapter cable

The fuses must be OK.

DTC memory

01-24

Work sequence

Note:

Only when engine does not start:

- Operate starter for approx. 6
seconds. Then do not switch the
ignition off.

The main fuses must be OK.

The battery voltage must be at

least 11.5 V.

Ground (GND) connection

between engine and body must
be OK.

All electrical devices, e.g. lights

and rear window heating must
be turned off.

If the vehicle is equipped with air

conditioning, it must be turned
off.

Selector lever must be in

position "P" or "N" on vehicles
with an automatic transmission.

- Connect VAG 1551 scan tool (or

VAG 1552) and select Engine
Control Module (ECM) with the
"Address word" 01. When doing
this the engine must be running at
idle: (Connecting scan tool and
selecting Engine Control Module
(ECM)

Page 01-12

).

DTC memory