Test sequence

• Connect vehicle diagnostic, test and information system VAS 5051 and select vehicle system "01 - Engine electronics". When doing this ignition must be on.

  See VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS 5051, CONNECTING AND SELECTING FUNCTIONS .

• Interrogate fault memory of engine control unit.

  See FAULT MEMORY, INTERROGATING AND ERASING .

If display shows a malfunction relating to Wastegate Bypass Regulator Valve -N75-:

• Remove air filter housing. See REMOVING .
• Disconnect hoses from Wastegate Bypass Regulator Valve -N75- but leave electrical connector plugged in.
Fig 1: Disconnecting Hoses From Wastegate Bypass Regulator Valve
Courtesy of AUDI OF AMERICA, INC.
• Connect a hose to longer connection on valve shown in illustration (arrow).
  • Vehicle diagnostic, testing and information system VAS 5051 is connected; vehicle system "01 - Engine electronics" is selected. Ignition must be switched on.

Display on VAS 5051:

• Select diagnosis function "03 - Final control diagnosis" from menu -1-

• Press the > button repeatedly until following display appears:

Display on VAS 5051:

4 - Charge pressure control valve -N75-

A - Actuator test is waiting - Continued switching required

• Press the > button.

Display on VAS 5051:

A - Actuator is running - Continued switching allowed

• Valve should click...
• ...and open and close (can be checked by blowing into auxiliary hose).

• Press the < button to exit from function "03 - Final control diagnosis".

Valve does not click:

• Test internal resistance of valve, see TESTING INTERNAL RESISTANCE .

If valve does not open and close properly:

• Replace Wastegate Bypass Regulator Valve -N75-