Volkswagen Golf / Golf GTI / Jetta. Manual — part 196

24-38

Components, checking

Heated Oxygen Sensor (HO2S),
checking

Note:

The vehicle must be raised to gain access to

the Oxygen Sensor (O2S) connector.

Only gold plated terminals may be used to

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

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

VAG 1526 or Fluke 83 Hand multimeter or VAG

1715 multimeter

VAG 1594 Adapter set

VAG 1598/31 Test box

Electrical Wiring Diagrams

Components, checking

24-39

Test requirements

Electrical Wiring Diagrams,

Troubleshooting & Component
Locations

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 switched
off.

Selector lever must be in

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

Fuel Pump (FP) relay -J17- must

be OK., checking:

Components, checking

24-40

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

).

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-, -4- and -1- for "Display group

number 41" and confirm entry with -Q- button.

Read measured value block 41

1

2

3

4

Indicated on display: (1...4

display zones)

- Check status of the Oxygen Sensor (O2S)

heating in display zone 2: Display: Htg.bC.ON /
Htg.bC.OFF (alternating):

Components, checking

24-41

Note:

The Oxygen Sensor (O2S) heating may be
switched on or off depending on the operating
conditions of the engine, therefore the display in
display zone 2 may show "Htg.bC.ON" or
alternating from "Htg.bC.ON" to "Htg.bC.OFF".

- Press

button.

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

output" and confirm entry with -Q- button.

- Switch off ignition.

If the display does not indicate as described:

- Remove protective cover (arrows) and

disconnect 6-pin connector (black) -1- to Heated
Oxygen Sensor (HO2S) -G39-.

Components, checking