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HOMESERVICE MANUALSVOLKSWAGEN2003PASSAT SEDAN (3B3) L4-1.8L TURBO (AWM)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSCOMBINATION VALVE, CHECKING
2003 Volkswagen Passat Sedan (3B3) L4-1.8L Turbo (AWM)

Combination Valve, Checking

2003 Volkswagen Passat Sedan (3B3) L4-1.8L Turbo (AWM)SECTION Combination Valve, Checking


Combination Valve, Checking

Recommended Special Tools And Equipment







- VAG1390 hand vacuum pump

Test requirements
- No leaks in vacuum lines or hose connections.
- Vacuum hoses not clogged or kinked
- Pressure hose for Secondary Air Injection (AIR) Pump Motor not clogged or kinked

Test sequence







- Disconnect vacuum hose at combination valve (arrow) and connect the hand vacuum pump (VAG1390).

NOTE: Do not use pressurized air for the following test.







- Disconnect pressure hose (arrow) at Secondary Air Injection (AIR) pump motor and blow air in with light pressure.
Combination valve must close.
- Operate vacuum pump.
Valve must open.

If combination valve does not open:
- Replace combination valve.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.