Volkswagen Golf / Golf GTI / Jetta. Manual — part 84

20-56

Functional check

Test conditions

Coolant temperature must be at least 85

C,

display group 1, display zone 2.

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

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

1" and confirm entry with Q key.

System in basic setting 1

1

2

3

4

Indicated on display (1...4

display zones)

Evaporative Emissions (EVAP) system

20-57

Only continue with the test when

The coolant temperature is

above 85 C -Display zone 2-

- Change to display group 70 as

follows:

- Press C key.

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 keys 0, 7 and 0 for "Display

group number 70" and confirm
entry with Q key.

System in basic setting 70

1

2

3

4

Indicated on display (1...4

display

zones)

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

Note:

This process can take approx. 30
seconds.

Evaporative Emissions (EVAP) system

20-58

- Leave engine running at idling speed until

display zone 4 displays specification TBV OK.

Note:

TBV stands for tank breather valve (EVAP

canister purge regulator valve -N80-).

If "TBV 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 "TBV 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

20-59

- Generate readiness code again if DTC memory

has been erased or engine control module
separated from permanent positive supply.

Repair Manual, 2.8 Liter VR6 4V Fuel Injection

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

If no DTC is stored in DTC memory:

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

confirm entry with Q key.

- Switch ignition off.

- Check breather lines to EVAP canister (may be

kinked).

- Check EVAP system for leaks

Page 20-47

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Evaporative Emissions (EVAP) system