Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSVOLKSWAGEN2003GOLF (1J1) L4-1.8L TURBO (AWW)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSAIR INJECTIONTESTING AND INSPECTIONCOMBINATION VALVE, CHECKING
2003 Volkswagen Golf (1J1) L4-1.8L Turbo (AWW)
Combination Valve, Checking
2003 Volkswagen Golf (1J1) L4-1.8L Turbo (AWW)SECTION Combination Valve, Checking
Special tools and equipment
- VAG 1390 hand vacuum pump
Test requirements
- No DTCs in DTC memory.
- Output Diagnostic Test Mode (DTM) performed.
- No leaks in vacuum lines or hose connections
- Vacuum hoses not clogged or kinked
Test sequence
- Disconnect vacuum hose -1- at Secondary Air Injection (A1R) solenoid valve (N112) -2-.
- Connect VAG 1390 vacuum pump to vacuum hose -1-.
NOTES: Do not use pressurized air for the following test!
- Disconnect pressure hose -3- at Secondary Air Injection (AIR) pump and blow air in with light pressure (arrow).
Combination valve must close.
- Operate vacuum pump.
Valve must open.
If combination valve does not open:
- Replace the 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.