Passat Sedan 4Motion W8-4.0L (BDP) (2002)
Air Injection Control Valve: Testing and Inspection
Combination Valve, Checking
Combination valves, 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
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Disconnect vacuum hose of combination valve to be checked:
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Cylinder bank 1, item 3 ,
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Cylinder bank 2, item 4 .
NOTE:
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Cylinder bank 1 = in driving direction, right
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Cylinder bank 2 = in driving direction, left
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Connect hand vacuum pump to vacuum connection of combination valve (arrow).
NOTE: Do not use pressurized air for the following test!
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Remove front noise insulation.
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Disconnect pressure hose (arrow) between Secondary Air Injection (AIR) Pump Motor and connecting line and blow into it with light pressure.
Both combination valves must be closed.
NOTE: To disengage, compress the buttons at the hose coupling.
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Operate hand vacuum pump.
The respective combination valve must open.
If the combination valve does not open or it is constantly open:
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Replace the respective combination valve:
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Cylinder bank 1, item 3 ,
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Cylinder bank 2, item 4 .
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Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
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Generate readiness code. See: Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes