Performing pressure test

• With outlet hose -1- of VAG 1687 connected to air pressure adapter:
• Attach shop air supply line to previously installed male fitting.
  Fig 1: Performing Pressure Test With Outlet Hose -1- Of VAG 1687 Connected To Air Pressure Adapter

  Courtesy of AUDI OF AMERICA, INC.
• Open valve -3- between regulator valve and gauge.
  Fig 2: Locating Valve -3- Between Regulator Valve And Gauge

  Courtesy of AUDI OF AMERICA, INC.
• Adjust test pressure up to 0.5 bar (see CAUTION below) by turning regulator valve -2-.
  CAUTION:

  • DO NOT pressurize the system above 0.5 bar!
  • Doing so may force oil into the intake system which can damage the engine.
• Slowly open outlet valve -4- (after gauge) to test hose connections.
• Observe pressure gauge for a drop in pressure.
  NOTE: Some pressure will be lost past the throttle plate.
• Readjust test pressure to 0.5 bar (see CAUTION above) by turning regulator valve -2-.
• Listen for any very large intake leaks.

If smoke generator was used to fill the system with smoke:

• Inspect intake system connections for smoke at leaks.
  NOTE: An ultrasonic detector may also be used to detect extremely small leaks where smoke may not be visible.
• Repair any leaks found.
• Remove tester.
• Remove plug from crankcase ventilation hose.
• Remove air pressure adapter.

With VAS 5051 diagnostic tool connected:

• Erase DTC memory.

If smoke generator was not used to fill the system with smoke:

• Apply soapy water solution or equivalent to intake system connections.
  NOTE: An ultrasonic detector may also be used to detect extremely small leaks.
• Inspect intake system connections for leaks.
• Repair any leaks found.
• Remove tester.
• Remove plug from crankcase ventilation hose.
• Remove air pressure adapter.

With VAS 5051 diagnostic tool connected:

• Erase DTC memory.