Volkswagen Golf / Golf GTI / Jetta. Manual — part 103

26-50

If test is OK:

LDP has activated and the system is
pressurized.

If the test aborts and DTCs other
than for small or large leaks are
stored:

When "Check end" is indicated on
VAS 5051 or VAS 5052:

Note:

Only check LDP during "Check end"
phase when "Test OK" was
indicated.

Indicated by "1" in position 6 and

a "0" in position 8 as shown.

- Using a compressed air blow gun,

clear area near LDP and LDP
filter of any residual smoke.

- Check and repair according to

DTC listed in DTC table for
appropriate engine code.

- Use smoke generator trigger to fill

system with smoke again.

- Check for smoke doming from

LDP filter and LDP hose
connections.

Smoke coming from filter

indicates a faulty LDP

Smoke coming from LDP

outlet or hose indicates a
faulty hose or clamp

Secondary air system

26-51

- Make repairs as necessary and check with

smoke again.

No smoke coming from filter indicates LDP

is OK and leak is somewhere else in EVAP
system

Note:

If the KLI 9210 EVAP system tester is connected
in "Test" mode and Basic settings (using Self
Diagnosis) and Fault finding are activated, a
false "System OK" message may be generated.

If the LDP is OK and a DTC was stored for the
EVAP system:

- Switch ignition off.

- Continue checking EVAP system as follows:

Checking EVAP system for leaks

CAUTION!

Clamp only soft rubber lines when isolating a
leak. To avoid risk of damage, never clamp hard
plastic lines!

- Clamp off LDP outlet (EVAP side) -1- using

special tool 3094 or equivalent.

- Turn control valve from "Hold" to "Test".

- Allow fuel system to pressurize.

Secondary air system

26-52

Note:

Fuel system pressurization depends on volume

of fuel system and amount of fuel in tank.

If fuel system pressurization does not stabilize:

- Verify that all fuel system outlets have been

sealed before continuing.

Note:

Any flow shown on flow meter indicates a leak.

Flow below flow meter flag set at vehicle leak
standard may indicate a sporadic DTC.

If flow meter on tester registers flow near or

above pre-set pressure:

- Clamp off hose leading from EVAP canister

purge regulator valve -N80- to intake manifold.

If flow stops:

- Replace EVAP canister purge regulator valve -

N80- and repeat test before continuing.

If meter indicates no flow after test:

- Perform quality check and return vehicle to

customer.

If flow continues:

- Use smoke generator trigger to charge fuel

system with smoke again.

Secondary air system

26-53

- Inspect complete EVAP system for escaping

smoke.

Note:

It may be necessary to move, twist, or wiggle
EVAP components around to reproduce leak.

If leak cannot be found using smoke:

If leak cannot be located:

CAUTION!

Clamp only soft rubber lines when isolating a
leak. To avoid risk of damage, never clamp hard
plastic lines!

If flow stops:

When leak has been located:

- Locate leak with ultrasonic tester.

General search: tester only

Localized search: tester with extension

wand (left)

- Disconnect and plug or clamp shut EVAP lines

to isolate fuel tank using special tool 3094 or
equivalent before continuing.

- Reconnect EVAP lines and search area that was

isolated.

- Repair leak and repeat EVAP system test.

Secondary air system