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 .

  When indicated on display

  Fig 1: VAG 1551 Scan Tool Display (Rapid Data Transfer)

  Courtesy of AUDI OF AMERICA, INC.
• Press buttons -0- and -8- to select "Read Measuring Value Block" and press -Q- button to confirm input.

  When indicated on display

  Fig 2: VAG 1551 Scan Tool Display (Read Measuring Value Block)

  Courtesy of AUDI OF AMERICA, INC.
• Press buttons -1-, -1- and -2- to select "display group number 112" and press -Q- button to confirm input.

  Indicated on display (1 - 4 = display fields)

  Fig 3: VAG 1551 Scan Tool Display (Read Measuring Value Block 112)

  Courtesy of AUDI OF AMERICA, INC.
• Check exhaust gas temperature.
• Road test vehicle to check exhaust gas temperature.
  • Wide Open Throttle (WOT) at engine speeds between 5000 - 6500 RPM must be reached.

Fig 4: Display Group 112: Exhaust Temperature

Courtesy of AUDI OF AMERICA, INC.

1) During oscillation stage, values around 1025° C may be displayed briefly. See Fig 4.

2) During oscillation stage, values of 25% may be displayed briefly. See Fig 4.

If values above 20% are displayed constantly, then

• Fuel pressure may be too low,
• Mass air flow sensor signal may be too small.

• Select measuring value block 220.

  Indicated on display (1 - 4 = display fields)

• Check exhaust temperature regulation.
  Fig 5: VAG 1551 Scan Tool Display (Read Measuring Value Block 220)

  Courtesy of AUDI OF AMERICA, INC.
  Fig 6: Display Group 220: Exhaust Gas Temperature Regulation

  Courtesy of AUDI OF AMERICA, INC.
• Repeat test for bank 2, measuring value block 221

  If specified values are not obtained and there is a malfunction stored in DTC memory:

• Check exhaust gas temperature sensor.