Preparations For Compressor And Pressure Line Leak Check

• When an appropriate entry is made in the event memory, there is a prompt in "Guided Fault Finding" to perform a leak check using the Vehicle Diagnostic Tester.
• Then the preparations for this leak test are described that must be carried out directly in the front seat.
• Connection diagram with assignment of the pneumatic lines to the air cushions. Refer to CONNECTION DIAGRAM - PNEUMATIC SYSTEM .

Special tools and workshop equipment required 

• Digital Pressure Sensor:V.A.G 1397B 
  Fig 1: Turbocharger Tester Kit VAG1397B

  Courtesy of AUDI
• Hose Cutting Pliers:VAS 6228 
  Fig 2: Air Hose Pliers VAS 6228

  Courtesy of AUDI
• Pneumatic Repair Set:VAS 6618 A 
• Vehicle Diagnostic Tester

Procedure

• The backrest cover is removed. Refer to BACKREST COVER, REMOVING AND INSTALLING .
• To check, the pneumatic line from the compressor is not disconnected at the connection, but is disconnected by the described procedure. Refer to PNEUMATIC LINES, DISCONNECTING AND CONNECTING .
• To connect during the leak test, insert the pneumatic lines into the Connecting Sleeves :VAS 6618/2  from both sides -A arrows-.
  Fig 3: Attach The Connecting Sleeves

  Courtesy of AUDI
• To release, push the release rings -B arrows- and simultaneously remove pneumatic lines -C arrows-.

In one of the test steps in "Guided Fault Finding", it is prompted to connect the Turbocharger Tester Kit:V.A.G 1397A  to the pneumatic line to the Valve Block 2 in Driver Seat Valve Block 2 in Driver Seat -N476- / Valve Block 2 in Front Passenger Seat Valve Block 2 in Front Passenger Seat -N478-.

Courtesy of AUDI

-- Disconnect the pneumatic line -arrow- to the valve block 2.

-- Using hoses and adapter pieces from the Pneumatic Repair Set:VAS 6618A  , connect the Turbocharger Tester Kit:V.A.G 1397A  to the pneumatic line -2- coming from the compressor.

Courtesy of AUDI

1 -  Valve Block 2 in Driver Seat Valve Block 2 in Driver Seat -N476- / Valve Block 2 in Front Passenger Seat Valve Block 2 in Front Passenger Seat -N478-

TIP:

To connect the pneumatic lines, make an adapter hose from the Pneumatic Repair Set:VAS 6618 A  .

-- Connect the pneumatic lines following the leak test. Refer to PNEUMATIC LINES, DISCONNECTING AND CONNECTING .