Performing pressure test:
- With outlet hose -1- of V.A.G 1687 connected to air pressure adapter:
- Attach shop air supply line to previously installed male fitting (Refer to Intake system, checking for leaks using V.A.G 1687 Diagnostic Tool ).
- Open valve -3- between regulator valve and gauge.
- 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.