Volkswagen Golf / Golf GTI / Jetta. Manual — part 83

20-52

- 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 that fuel tank cap is completely closed or

if seal is leaking, replace as necessary.

- Repeat functional check.

If fault is still present:

- Check that fuel delivery unit union nut is tight or

if seal is leaking replace as necessary,

Page

20-15

, Removing and installing fuel delivery

unit.

- Repeat functional check.

If fault is still present:

Evaporative Emissions (EVAP) system

20-53

- Remove rear right wheel housing liner:

Repair Manual, Body Exterior, Repair Group

66

- Check to see if pressure hose between LDP and

EVAP canister is leaking

Page 20-43

, item -

8 - and replace if necessary.

- Check lines and line connections between EVAP

canister and fuel tank flap unit or tank breather
valve for leaks

Page 20-44

, Assembly

overview of EVAP system.

- Repeat functional check.

If fault is still present:

- Remove EVAP canister and check for cracks

and leaks, replace if necessary

Page 20-41

,

Servicing components of EVAP system.

- Repeat functional check.

Evaporative Emissions (EVAP) system

20-54

EVAP canister purge regulator
valve -N80-, checking

In a no-current situation the solenoid
valve is closed.

Special tools and equipment

Note:

All functions which could previously
be performed with V.A.G 1551/1552
can also be performed with the new
tester VAS 5051.

Test conditions

V.A.G 1551 Scan Tool (or

vehicle system tester V.A.G
1552) with cable VAG 1551/3

The fuses must be OK.

Battery voltage must be at least

11.5 V.

All electrical consumers, e.g.

lights and rear window defroster
must be switched off.

If the vehicle is equipped with air

conditioning, this must be
switched off.

Evaporative Emissions (EVAP) system

20-55

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 EVAP canister purge

regulator valve -N80- 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 20-56

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Evaporative Emissions (EVAP) system