Volkswagen Golf / Golf GTI / Jetta. Manual — part 144

01-155

- Read Engine Coolant Temperature value in

display zone 3.

Specification: 85 to 110 C

- Read Intake Air Temperature value in display

zone 4.

Specification: Ambient temperature less than 80

C

If the specifications are obtained:

- Press

button.

Work step 5: Evaporative Emissions (EVAP)
Canister system diagnosis (Tank ventilation
system)

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:

Note:

The engine must not be loaded during this
diagnosis, if this occurs the diagnosis will be
interrupted and will not start again until the engine
is revved-up.

- Press buttons -0-, -7- and -1- for "Display group

number 71" and confirm entry with -Q- button.

Readiness code

01-156

System in basic setting 71

1

2

3

4

Indicated on display: (1 to 4

display zones)

If "Reed op." appears in display zone
1:

If the diagnosis is initiated by the
Motronic Engine Control Module
(ECM) -J220- the display in display
zone 4 jumps from "Test OFF" to
"Test ON".

Note:

If the display in display zone 4 jumps
from "Test OFF" to "Test ON" during
the diagnosis, repeat the diagnosis
again. When repeating the
diagnosis, the diagnosis can take up
to 60 seconds before the display in
display zone 4 jumps from "Test
OFF" to "Test ON".

If "Sm leak or La leak" (meaning
Small leak or Large leak) appears in
display zone 2 and "Sys. n.OK."
appears in display zone 4:

- Open fuel tank filler cap briefly to

release pressure in fuel tank. This
will close reed terminal.

- Leave engine running at idle until

specification "Sys. OK." is
displayed in display zone 4.

- Press

button.

Readiness code

01-157

- Check DTC memory, repair Diagnostic Trouble

Codes (DTCs) if necessary and then erase DTC
memory

Page 01-23

, DTC memory, checking

and erasing.

- Read readiness code

Page 01-146

. If the

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

Page 01-149

.

If no DTC is stored:

- Check Evaporative Emissions (EVAP) Canister

system for leaks:

Repair Manual, 2.8 Liter VR6 4V Engine

Mechanical, Engine Code(s): BDF; Repair Group
20

If "Sys. OK." appears in display zone 4:

- Press

button.

Work step 6: Oxygen Sensor (O2S) control
diagnosis status before Three Way Catalytic
Converter (TWC)

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:

Readiness code

01-158

- 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)

Significance of figures in 3 digit number block

Page 01-217

.

Note:

The bits in display zones 1 will not be set to 1 until
the Three Way Catalytic Converter (TWC)
temperature rises above 380 C (

display groups

34, display zone 2).

If the specification is not obtained:

If the specification is obtained:

- Check Oxygen Sensor (O2S) control status

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

Specification: 111

- Press

button.

- Check Oxygen Sensor (O2S) heater of Oxygen

Sensor (O2S) before Three Way Catalytic
Converter (TWC)

Page 24-38

.

- Press

button.

Readiness code