Volkswagen Golf / Golf GTI / Jetta. Manual — part 82

20-48

Selector lever must be in position "P" or "N"

on models with an automatic transmission.

Fuel pump relay -J17- must be OK,

checking:

Electrical Wiring Diagrams, Troubleshooting &

Component Locations

No DTCs may be stored in DTC memory:

Repair Manual, 2.8 Liter VR6 4V Fuel Injection

& Ignition, Engine Code(s): BDF, Repair Group
01

Checking activation

- Check activation of LDP -V144- via output

Diagnostic Test Mode (DTM):

Repair Manual, 2.8 Liter VR6 4V Fuel Injection

& Ignition, Engine Code(s): BDF, Repair Group
01

If activation is OK:

- Perform functional check

Page 20-49

.

Evaporative Emissions (EVAP) system

20-49

Functional check

Test conditions

Throttle valve angle less than 4%,

display

group 3, display zone 3.

Coolant temperature must be 85...110 C

display group 4, display zone 3.

Intake air temperature less than 80 C,

display group 4, display zone 4.

Test sequence

- Connect V.A.G 1551 Scan Tool (or V.A.G 1552).

Start engine and select "Address word" 01 of
engine control module.

Repair Manual, 2.8 Liter VR6 4V Fuel Injection

& Ignition, Engine Code(s): BDF, Repair Group
01

Rapid data transfer

HELP

Select function XX

Indicated on display

- Press keys 0 and 4 for function "Initiate basic

setting" and confirm entry with Q key.

Basic setting

Input display group number XXX

Indicated on display

Evaporative Emissions (EVAP) system

20-50

- Press keys 0, 7 and 1 for "Display group number

71" and confirm entry with Q key.

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.

System in basic setting 71

1

2

3

4

Indicated on display (1...4

display zones)

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

If the diagnosis is initiated by the engine control
module the display in display zone 4 jumps from
"Test OFF" to "Test ON".

Note:

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

- Open fuel tank filler cap briefly to release

pressure in fuel tank. This will close reed
contact.

Evaporative Emissions (EVAP) system

20-51

- Leave engine running at idling speed until

display zone 4 displays specification "Syst. OK.".

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

- Press

key.

- Press keys 0 and 6 for function "End output" and

confirm entry with Q key.

- Switch ignition off.

If "Sm leak or La leak" appears in display zone 2

and "Sys. n.OK." appears in display zone 4:

- Press

key.

- Check DTC memory:

Repair Manual, 2.8 Liter VR6 4V Fuel Injection

& Ignition, Engine Code(s): BDF, Repair Group
01

- Read readiness code:

Repair Manual, 2.8 Liter VR6 4V Fuel Injection

& Ignition, Engine Code(s): BDF, Repair Group
01

Evaporative Emissions (EVAP) system