Adjust The Turbine Switch-Over Vacuum Diaphragm

Special tools and workshop equipment required 

• Vehicle Diagnostic Tester
• Turbocharger Tester Kit VAG1397A
• Hand Vacuum Pump VAS6213
• Pressure Control Valve VAS6342

Procedure

-- Remove the engine cover, refer to ENGINE COVER, REMOVING AND INSTALLING .

-- Loosen the clamp -3- and remove the air guide hose.

Fig 1: Identifying Connector, Bolts And Air Hose Guide

Courtesy of AUDI OF AMERICA, LLC

-- Remove the vacuum line to the vacuum diaphragm for the turbine switch-over on the Turbine Switch-Over Valve -N529- -arrow-.

Fig 2: Identifying Vacuum Line, Vacuum Diaphragm And Turbine Switch-Over Valve

Courtesy of AUDI OF AMERICA, LLC

-- Connect the Hand Vacuum Pump VAS6213 and Pressure Control Valve VAS6342 to the removed vacuum diaphragm and to connection "II" on the Turbocharger Tester Kit VAG1397A, as illustrated.

Fig 3: Hand Vacuum Pump Setup

Courtesy of AUDI OF AMERICA, LLC

-- Connect the Pressure Control Valve VAS6342.

• The lever -1- is horizontal.

-- Set the Vacuum Pump VAS6213 slide ring -2- in the "vacuum" position.

-- Switch the Turbocharger Tester Kit VAG1397A and set the slide switch to position "II".

-- Select 02-Measured Values  in Guided Fault Finding 01 Engine Electronics  on the Vehicle Diagnostic Tester.

Fig 4: Display On VAS 5051 - (1St Control Element In Test & Evaporative Emission (EVAP) Canister Purge Regulator Valve)

Courtesy of AUDI OF AMERICA, LLC

-- Select High Pressure Turbocharger Bypass Valve Turbine Input, Raw Voltage  from measured value list.

-- Operate the Hand Vacuum Pump VAS6213 until the Turbocharger Tester VAG1397A shows the following value:

• 200 mbar (2.9 psi).

-- Read the voltage value on the Vehicle Diagnostic Tester.

• Specified value: 4090 to 4190 mV.

-- Check the adjustment, to do this operate the Hand Vacuum Pump VAS6213 until the Hand Vacuum Pump VAS6213 pressure gauge displays the following values:

• 700 mbar (10.15 psi).

-- Read the voltage value on the Vehicle Diagnostic Tester.

• Specified value: 4150 to 4250 mV.

If Specification Is Not Attained

-- Remove the catalytic converter, refer to CATALYTIC CONVERTER, REMOVING AND INSTALLING, VEHICLES WITH TWO TURBOCHARGERS .

-- Reduce the vacuum via the Pressure Control Valve VAS6342 to approximately 100 mbar (1.4 psi).

Fig 5: Identifying Actuator Rod

Courtesy of AUDI OF AMERICA, LLC

-- Open the lock nut -3- with the open-end wrench.

-- Unclip the lock washer -1- and remove the actuator rod from the adjusting lever.

-- Turn the upper part of the actuator rod -2- left or right on its own axis to extend or shorten it.

-- Push the actuator rod -2- on the adjusting lever.

Fig 6: Identifying Actuator Rod

Courtesy of AUDI OF AMERICA, LLC

-- Repeat the test with the Hand Vacuum Pump VAS6213 and the Vehicle Diagnostic Tester.

-- If the specified value is now reached, install the lock washer -1- and tighten the lock nut -3-.

-- Check the adjustment again, to do this operate the Hand Vacuum PumpVAS6213 until the Hand Vacuum Pump VAS6213 pressure gauge displays the following values:

• 700 mbar (10.15 psi).

-- Read the voltage value on the Vehicle Diagnostic Tester.

• Specified value: 4150 to 4250 mV.

If Specified Value Is Obtained

-- Install the catalytic converter, refer to CATALYTIC CONVERTER, REMOVING AND INSTALLING, VEHICLES WITH TWO TURBOCHARGERS .