EVAP system, checking using tester KLI 9210: Conditions

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2008 Audi S4, 2008 Audi RS 4, 2008 Audi A4, 2007 Audi S4, and 2007 Audi RS 4. However, it is still accessible from the selected car via links, so may be relevant.

Ignition switched off
LDP is visible → Component Locations

Fig 1: Tester Hose Connected To Fuel Filler Neck

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Tester hose connected to fuel filler neck
VAS 5051 or VAS 5052 Diagnostic tool connected to vehicle
Smoke generator connected to battery

Turn KLI 9210 valve to "Test" and use smoke generator trigger to fill system with smoke (wait until smoke is coming out of the LDP filter).
Start engine.
From VAS 5051 Start-up screen, select "Vehicle self diagnosis".

Fig 2: Display Screen - Select Diagnostic Function

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Select vehicle system "01 - Engine electronics".

Fig 3: Display Screen - 01 - Engine Electronics

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Select Diagnosis Function "04 - Basic settings".

Fig 4: Display Screen - 01 - Engine Electronics, Basic Settings

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Input appropriate display group from table below on keypad.

Engine code	Display group
AEB, AEG, AFP, AHA, APH, ATQ, ATW, AUG, AWD, AWM, AWP, AWV, AWW, BDC, BDF, BEV, BGD, BGJ	071
AVH, AZG, BAP, BBW, BDP	202

Press "Q" on keypad to confirm.

LDP should activate

If LDP does not activate:

For some vehicles using Display group 202 a similar screen appears indicating "Test Off".

Fig 5: Display Screen - 01 - Engine Electronics, Basic Settings, LDP Activated

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Select "Activating" button.

If LDP does not activate:

Check electrical connections to LDP.
Check vacuum source to LDP.

If LDP activates:

Fig 6: Identifying Display Screen - 01 - Engine Electronics, Basic Settings, LDP Activated, "1" In Position 5

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A similar screen appears, Test is "ON" (indicated by a "1" in position 5, - arrow -).

Fig 7: Identifying Display Screen - 01 - Engine Electronics, Basic Settings, LDP Activated, Position 1

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Position 1 - arrow - alternates between "0" and "1" during pump operation.

Fig 8: Identifying Display Screen - 01 - Engine Electronics, Basic Settings, LDP Activated, "1" In Position 6 And "0" In Position 8

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If test is OK:

Indicated by "1" in position 6 and a "0" in position 8 as shown.

LDP has activated and the system is pressurized.

Using a compressed air blow gun, clear area near LDP and LDP filter of any residual smoke.

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

Check and repair according to DTC listed in DTC table for appropriate engine code.

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

NOTE:

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

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

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: