Volkswagen Golf / Golf GTI / Jetta. Manual — part 225

24-154

Oxygen Sensor (O2S) Behind
Three Way Catalytic Converter
(TWC) -G130-, checking aging

Special tools and equipment

Note:

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

VAG 1551 Scan tool (or VAG

1552) with VAG 1551/3 adapter
cable

Functions, checking

24-155

Test requirements

Functional check

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, it must be turned
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.

Coolant temperature must be at

least 85 C,

display group 1,

display zone 2.

Three Way Catalytic Converter

(TWC) temperature must be at
least 380 C,

display group

34, display zone 2.

- 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

).

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24-156

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-, -4- and -3- for

"Display group number 43" and
confirm entry with -Q- button.

System in basic setting 43

1

2

3

4

Indicated on display: (1...4

display

zones)

When performing this test the Three
Way Catalytic Converter (TWC)
temperature in display zone 2 must
be at least 380 C.

Note:

This process can take approx. 30
seconds.

- Depress brake pedal and hold.

- Depress accelerator down to wide

open throttle position.

Engine speed will be increased by

Motronic Engine Control Module
(ECM) -J220- to approx. 2300
rpm.

- Depress brake pedal and

accelerator down and hold until
display in display zone 4 jumps
from "Test OFF" to "Test ON."

Functions, checking

24-157

- Depress and hold brake pedal and accelerator

until display zone 4 displays specification "B1-P2
OK."

- Release brake and accelerator pedals.

- Press

button.

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

output" and confirm entry with -Q- button.

If the display does not indicate as described:

- Road test vehicle to remove possible residue on

Oxygen Sensor (O2S) and repeat check.

Observe the valid safety precautions when

performing a road test

Page 24-33

.

If the display does not indicate as described

again:

- Check Oxygen Sensor (O2S) and Oxygen

Sensor control after Three Way Catalytic
Converter (TWC)

Page 24-140

.

Functions, checking