Performing pressure test
WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, and 2003 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
- With outlet hose - 1 - of VAG1687 connected to air pressure adapter:
- Attach shop air supply line to previously installed male fitting → Charge pressure leak test with VAG1687 .
- Open valve - 3 - between regulator valve and gauge.
- Adjust test pressure up to 0.5 bar (→ 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 (CAUTION ) 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 VAS5051 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 VAS5051 diagnostic tool connected:
- Erase DTC memory.