Volkswagen Golf / Golf GTI / Jetta. Manual — part 198

24-46

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, this 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

24-47

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 to 4

display zones)

- Check the status of the Oxygen Sensor (O2S)

heating in display zone 4: Display: Htg.aC.ON /
Htg.aC.OFF (alternating)

Components, checking

24-48

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 4 may show "Htg.aC.ON" or
alternating from "Htg.aC.ON" to "Htg.aC.OFF".

- Press the

button.

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

output" and confirm entry with the -Q- button.

- Switch off ignition.

If the display does not indicate as described:

- Remove protective cover -arrows- and

disconnect 4-pin connector (black) -1- to Oxygen
Sensor (O2S) Behind Three Way Catalytic
Converter (TWC) -G130-.

Components, checking

24-49

Checking resistance

If the specification is not obtained:

If the specification is obtained:

- Check sensor heater wire

resistance at connector terminals
1 and 2 to Oxygen Sensor (O2S).

- Specification: 6,4 to 47,5

(at

room temperature).

- Replace Oxygen Sensor (O2S) 2,

Bank 1 after Three Way Catalytic
Converter (TWC) -G130-

Page

24-17

, item 18 .

- 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

.

Components, checking