Volkswagen Golf / Golf GTI / Jetta. Manual — part 219

24-130

- Check control module DTC memory again.

- Repeat engine idle speed check.

If the specifications are not obtained again:

- Check Throttle Valve Control Module -J338-

Page 24-59

.

- Check operating condition of engine

Page 24-

158

.

- Check intake air system for leaks (unmetered

air)

Page 24-121

.

- Check signals from / to air conditioning system

Page 24-194

.

Functions, checking

24-131

Oxygen Sensor (O2S) and Oxygen
Sensor control before Three Way
Catalytic Converter (TWC), checking

Note:

The vehicle must be raised to gain access to

the Oxygen Sensor (O2S) connector.

Only gold plated terminals may be used to

service the terminals in the Oxygen Sensor
(O2S) connectors.

The Oxygen Sensor (O2S) before Three Way

Catalytic Converter (TWC) has a continuous
regulation and can be differentiated from the
Oxygen Sensor (O2S) Behind Three Way
Catalytic Converter (TWC) -G130- by its 6
connector.

Special tools, materials 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

VAG 1526 or Fluke 83 Hand multimeter or VAG

1715 multimeter

VAG 1594 Adapter set

Functions, checking

24-132

VAG 1598/31 test box

Electrical Wiring Diagrams

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, 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.

Engine Coolant Temperature

(ECT) 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.

Functions, checking

24-133

Functional check

- 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

).

Rapid data transfer

HELP

Select function XX

Indicated on display:

- Press buttons -0- and -8- for function "Read

measured value (data) block" and confirm entry
with -Q- button.

Read measured value block

Input display group number XXX

Indicated on display:

- Press buttons -0-, -3- and -0- for "Display group

number 30" and confirm entry with -Q- button.

Read measured value block 30

1

2

Indicated on display: (1 to 2

display zones)

- Check Oxygen Sensor control status before

Three Way Catalytic Converter (TWC) (display
zone 1):

Specification: 111

Significance of figures in 3 digit number block

Page 01-217

.

Functions, checking