Test sequence

• Connect VAS 5051 tester or VAG 1551 scan tool and select control module for engine electronics using "address word" 01." Engine must run at idle for this.

  See VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS5051 OR VAG1551 SCAN TOOL, CONNECTING AND SELECTING FUNCTIONS .

  Fig 1: Connecting VAG 1551 To DLC

  Courtesy of AUDI OF AMERICA, INC.

When indicated on display

Fig 2: Scan Tool Display - Boost Pressure Regulation, Checking (1 Of 3)

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• Press buttons -0- and -8- to select "Read Measuring Value Block" and press -Q- button to confirm input.

When indicated on display

Fig 3: Scan Tool Display - Boost Pressure Regulation, Checking (2 Of 3)

Courtesy of AUDI OF AMERICA, INC.

• Press buttons -1-, -1- and -5- to select "display group number 115" and press -Q- button to confirm input.

Indicated on display (1 - 4 = display fields)

Fig 4: Scan Tool Display - Boost Pressure Regulation, Checking (3 Of 3)

Courtesy of AUDI OF AMERICA, INC.

• Check charge air pressure regulation.
• Road test vehicle for this.
  • Wide Open Throttle (WOT)

  must be reached.

• Measurement must be taken at Wide Open Throttle (WOT).
  Fig 5: Display Group 115: Charge Air Pressure Regulation

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  Actual pressure must not deviate from specified pressure by more than 20 mbar.

• Select measuring value block 117.
• Check function of accelerator pedal in display field 2 by briefly depressing pedal to Wide Open Throttle.
  Fig 6: Display Group 117: Charge Air Pressure Regulation

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  If the specified value 100% is not reached at Wide Open Throttle (WOT):

• Check accelerator pedal.
• Select measuring value block 116.
• Check correction factors in display fields 2 to 4.
  Fig 7: Display Group 116: Charge Air Pressure Regulation

  Courtesy of AUDI OF AMERICA, INC.

  If display field 2 indicates a correction factor <0 %, fuel quality is probably incorrect.

• Fill tank with prescribed fuel quality.

  If display field 3 indicates a correction factor less than 0 %, coolant temperature is too high (heat warning lamp lit in instrument cluster) or the Engine Control Module is receiving an incorrect temperature signal from the instrument cluster.

• Check coolant temperature display.

  See INSTRUMENTS - UP TO 2000 or INSTRUMENTS - 2001 AND UP .

  If display field 4 indicates a correction factor less than 0%, intake air is too hot or the sensor for intake air temperature is faulty.

  See ON BOARD DIAGNOSTIC (OBD) - 2.7L V6 BITURBO - APB, BEL .

• Select measuring value block 114.
  Fig 8: Display Group 114: Charge Air Pressure Regulation

  Courtesy of AUDI OF AMERICA, INC.

  Load values in display fields 1 to 3 can deviate from each other by up to 5%.

  If specified values are not achieved in the measuring value blocks:

  Check the charge air pressure sensor -G31-.