Jetta Sedan V6-2.8L (BDF) (2003)
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Connect hand vacuum pump VAG 1390 to vacuum hose from combi-valve -arrow-.
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Disconnect pressure hose to combi-valve at coupling -arrow- and blow in using light pressure.
Combi-valve must be closed.
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Operate hand vacuum pump.
Combi-valve must open.
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When the combi-valve does not open or is continuously open
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Replace combi-valve.
With Generic Scan Tool
Combination Valve, Checking
Recommended special tools and equipment
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VAG1390 Hand Vacuum Pump
Test requirements
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No leaks in vacuum lines or hose connections.
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Vacuum hoses not clogged or kinked
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Pressure hose for Secondary Air Injection (AIR) Pump Motor not clogged or kinked
Test sequence
Vehicles with engine code AFP
NOTE: Do not use pressurized air for the following test.
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Remove front noise insulation.
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Disconnect vacuum hose from combination valve at Secondary Air Injection (AIR) Solenoid Valve -N112-, item 5.