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Home >> Audi >> 2005 >> TT Coupe (8N3) L4-1.8L Turbo (AWP) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Combination Valve, Checking
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Combination Valve, Checking



Combination Valve, Checking

Recommended Special Tools, Workshop Equipment, Testers, Measuring Instruments and Auxiliary Items
- V.A.G 1390 hand vacuum pump

Test Conditions
- Vacuum lines and hose connections free of leaks.
- Vacuum hoses not clogged or kinked
- Pressure hose for Secondary Air Injection (AIR) Pump Motor not clogged or kinked

Test Sequence
- Disconnect vacuum hose from combi-valve.







- Connect hand vacuum pump (V.A.G 1390 or VAS 6213 ) to vacuum hose -1- on combi-valve.

NOTE: Do not use compressed air during following check.

- Disconnect pressure hose at at Secondary Air Injection (AIR) pump motor -arrow- and blow air in with light pressure. Combi-valve must be closed.
- Operate the hand vacuum pump.

Combi-valve must open.

If the combination valve does not open or it is constantly open:
- Replace combi-valve.
- Erase DTC memory of ECM. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Generate Readiness Code
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