Passat Wagon L4-1781cc 1.8L Turbo (AEB) (1998)
Wastegate: Testing and Inspection
Wastegate Bypass Regulator Valve Pressure Unit, Checking
Special tools and equipment
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V.A.G 1551 Scan Tool or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3
Checking conditions
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Engine oil temperature min. 80 °C
Checking sequence
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Disconnect Wastegate Bypass Regulator valve -N75- -1 - connector -2-.
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Start engine and raise to maximum rpm briefly using throttle.
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Operating rod -2- must move.
If the operating rod does not move:
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Check valve lever -1- for ease of movement.
If corroded together:
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Replace turbocharger.
If the operating rod does not move, even though the lever is free to move:
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Test Wastegate Bypass Regulator valve -N75-.
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Hose from turbocharger via valve to pressure unit not blocked when connector is pulled off
If the valve -N75- is OK:
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Replace turbocharger.