Volkswagen Golf / Golf GTI / Jetta. Manual — part 218

24-126

Test requirements

The fuses must be OK.

The battery voltage must be at

least 11.5 V.

All electrical accessories, e.g.

lights and rear window defroster
must be switched off.

If the vehicle is equipped with air

conditioning, this must be
switched off.

Selector lever must be in

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

Exhaust system between Three

Way Catalytic Converter (TWC)
and cylinder head must be free
of leaks.

Engine Coolant Temperature

(ECT) must be at least 85 C,

display group 4, display zone

3.

Intake air temperature less than

60 C display group 04,
display zone 4.

Three Way Catalytic Converter

(TWC) temperature must be at
least 380 C,

display group

34, display zone 2.

Functions, checking

24-127

Test sequence

- Connect VAG 1551 Scan tool (or VAG 1552)

and select engine electronics control module
with "Address word" 01. Engine must be running
at idle speed: ((VAG 1551 and Motronic Engine
Control Module (ECM) -J220-, connecting and
selecting

Page 01-12

).

- Check DTC memory, repair malfunctions if

necessary and then erase DTC memory

Page

01-23

.

- Then:

- Connect scan tool.

- Continue running engine at idle.

Rapid data transfer

HELP

Select function XX

Indicated on display:

- Press buttons -0- and -4- for function "Initiate

basic setting" and confirm entry with -Q- button.

Basic setting

Input display group number XXX

Indicated on display:

- Press buttons -0-, -0- and -1- for "Display group

number 1" and confirm entry with -Q- button.

Functions, checking

24-128

System in basic setting 1

1

2

3

4

Indicated on display: (1 to 4

display zones)

Note:

In the function "System in basic
setting" the Evaporative Emission
(EVAP) Canister Purge Regulator
Valve -N80- is closed and the air
conditioner compressor turned off.

Checking idle speed

- Check adjustment conditions for

basic settings in display zone 4:

Specification: 11111111

Significance of figures in 8 digit

number block

Page 01-189

.

- Briefly increase engine speed

(rev- up) and then allow engine to
run at idle for 2 minutes.

- Change to display group 56 as

follows:

- Press -C- button.

- Press buttons -0-, -5- and -6- for

"Display group number 56" and
confirm entry with -Q- button.

System in basic setting 56

1

2

3

4

Indicated on display: (1 to 4

display zones)

Functions, checking

24-129

- Check operating conditions in display zone 4:

Specification: xx000

Significance of figures in 5 digit number block

Page 01-240

.

- Check specified idle speed in display zone 2.

Specification: 700 rpm

- Check actual idle speed in display zone 1.

Specification: 640 to 720 rpm

- Press

button.

- Press buttons 0 and 6 for function "End output"

and confirm entry with Q button.

- Switch off ignition.

If the idle speed is not obtained:

- Erase learned values and adapt Motronic

Engine Control Module (ECM) -J220- again

Page 24-182

.

- Road test vehicle.

Observe the valid safety precautions when

performing a road test

Page 24-33

.

Functions, checking