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HOMESERVICE MANUALSAUDI1996A4 BASE, STANDARDREPAIR AND DIAGNOSISQUICK LOOKUPSTECHNICAL BULLETINSTECHNICAL SERVICE BULLETINSOTHER VARIANTENGINE CONTROL SYSTEMSLEAK DETECTION PUMP (LDP) -V144-, QUICK CHECK (GROUP 20, NO. 08-10)
1996 Audi A4 Base, Standard

Leak Detection Pump (LDP) -V144-, Quick Check (GROUP 20, NO. 08-10)

1996 Audi A4 Base, StandardSECTION Leak Detection Pump (LDP) -V144-, Quick Check (GROUP 20, NO. 08-10)
WARNING: This page is about the A4 Base, Automatic, which is a different variant/trim than selected.
Publication date: 2008-12-08
Reference number: GROUP 20, NO. 08-10
Supersedes refnos: 2005590, GROUP 20, NO. 03-01, GROUP 20, NO. 03-02

LEAK DETECTION PUMP (LDP) -V144-, QUICK CHECK

LEAK DETECTION PUMP (LDP) -V144-, QUICK CHECK

TECHNICAL SERVICE BULLETIN

Reference Number(s): GROUP 20, NO. 08-10 (2005590/3), Date of Issue:  December 8, 2008
AUDI: All with LDP up to 2003
GROUP: 20 - Fuel Supply/Controls
Superceded Bulletin(s): GROUP 20, NO. 03-02, Date of Issue:  June 16, 2003, GROUP 20, NO. 03-01, Date of Issue:  February 28, 2003

SERVICE INFORMATION

20 08 10 2005590/3 December 8, 2008. Supersedes Technical Service Bulletin Group 20 number 03-02 dated June 16, 2003.

CONDITION

Unnecessary replacement of LDP due to mis-diagnosed leakage.

SERVICE

As long as the Leak Detection Pump -V144- is operational you can quickly diagnose it as OK or leaking using the following method.

Prior to checking the LDP:

  • Ensure that vacuum at vacuum hose to LDP item -2- (see Fig 4) is equal to vacuum at port (source) at throttle body.
    • Connect the VAS 5051 or VAS 5052 Diagnostic tool.
    • Start engine and run at idle only.
    • From VAS 5051 Start-up screen, select "Vehicle self diagnosis".
    • Select vehicle system "01- Engine electronics". See Fig 1.
      Fig 1: VAS Display - Select Vehicle System "01- Engine Electronics"
      G03343215
    • Select Diagnosis Function "04- Basic settings". See Fig 2.
      Fig 2: VAS Display - Select Diagnosis Function "04- Basic Settings"
      G03343216

EVAP CANISTER PURGE VALVE -N80-, CHECKING

NOTE: Purge valve check must be completed prior to checking LDP using "071" (see LDP -V144-, checking below).
  • Input "070" on keypad. See Fig 3.
    Fig 3: VAS Display - Input "070" On Keypad
    G03343217
  • Press "Q" on keypad to confirm.
  • Press "Activate" button.

After test completes:

  • VAS 5051 should indicate "TBV OK".

If test continues to indicate "TBV not OK":

  • Replace EVAP Canister Purge valve -N80-.
  • Repeat test.

If test continues to indicate "TBV OK":

  • Proceed with following steps.

LDP -V144-, CHECKING

  • Locate LDP -V144- (see appropriate Repair Manual, Repair Group 20- "Leak Detection Pump (LDP) -V144-, removing and installing"). 
  • Clamp off LDP outlet (EVAP side) -1- using Special Tool No. 3094 or equivalent. See Fig 4.
    Fig 4: Leak Detection Pump
    G03343218
  • Remove fuel cap.
    CAUTION: Clamp only soft rubber lines when isolating a leak. To avoid risk of damage, never clamp hard plastic lines!
  • Select the < button.
  • Input "071" on keypad. See Fig 5.
    Fig 5: VAS Display - Input "071" On Keypad
    G03343219
  • Press "Q" on keypad to confirm.
  • Press "Activate" button.
    • Pump should activate.
    • VAS 5051 should indicate "system OK".
  • Repeat test several times to verify result.
NOTE: You MUST remove and install the clamp (to release pressure), prior to repeating test.

If test continues to indicate "system OK":

  • Pump is OK (leak is not at the pump or hose connections at pump).
  • Switch ignition OFF.
  • Reinstall fuel cap.
  • Test EVAP system for leaks using the KLI9210 EVAP Tester (see Repair Manual Repair Group 20).

If LDP fails test:

  • Pump or hose connection between pinched hose -1- and pump are not OK.
  • Check and ensure hose -1- and/or connections between EVAP Canister and LDP are not leaking. See Fig 6.
    Fig 6: Leak Detection Pump
    G03343220
  • Recheck using "071" again and verify that hose and connection are OK.

    If hose connection(s) are NOT OK:

  • Repair connection or replace hose -1- as necessary.

If hose and connection at pump are OK:

  • Replace pump.
  • Recheck using "071" again and verify that new LDP operates correctly.
  • Reinstall fuel cap.
  • Remove clamp and check entire EVAP system.
  • Erase any stored DTCs.

WARRANTY INFORMATION

WARRANTY INFORMATION

When procedure applies to vehicles within the New Vehicle Limited Warranty, use the following: 
Part Identifier:  2048 
Labor Operation:  20480140 50 TU 
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.