Volkswagen Golf / Golf GTI / Jetta. Manual — part 221

24-138

Checking wiring for Heated
Oxygen Sensor (HO2S)

- Remove wiper arms and cowl

panel:

Repair Manual, Electrical

Equipment; Repair Group 92

- Connect VAG 1598/31 test box to

control module wiring harness.
Engine Control Module (ECM) -
J220- remains disconnected.

- Remove protective cover (arrows)

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

Functions, checking

24-139

If no wiring malfunction is detected:

- Check wiring for open circuit

between test box and 6-pin
connector (to control module)
referring to Electrical Wiring
Diagrams.

Terminal 1 and socket 70

Terminal 2 and socket 71

Terminal 5 and socket 51

Terminal 6 and socket 52

Wire resistance: max. 1.5

- Additionally check wires all for

short to one another.

Specification:

- Replace Heated Oxygen Sensor

(HO2S) -G39-

Page 24-19

,

item 20 .

- Check DTC memory, repair

malfunctions if necessary and
then erase DTC memory

Page

01-23

.

- Erase learned values and adapt

Motronic Engine Control Module
(ECM) -J220- again

Page 24-

182

.

- Read readiness code

Page 01-

146

. If DTC memory has been

erased or Motronic Engine
Control Module (ECM) -J220- was
disconnected from battery
positive (B+), readiness code
must be generated again

Page

01-149

.

Functions, checking

24-140

Oxygen Sensor (O2S) and Oxygen
Sensor control after 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.

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

VAG 1598/31 test box

Electrical Wiring Diagrams

Functions, checking

24-141

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 1, display zone

2.

Three Way Catalytic Converter

(TWC) temperature must be at
least 380 C,

display group

34, display zone 2.

Functions, checking