Passat Wagon L4-1781cc 1.8L Turbo (AEB) (1998)
Boost Solenoid: Testing and Inspection
Boost Pressure System, Checking
Special testers required
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VAG 1397 A Turbocharger tester
Checking requirements
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Intake and exhaust systems leak tight
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Engine oil temperature 80°C minimum
Notes:
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Boost pressure is measured under full load, while driving on the road or on a dynamometer.
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10 seconds maximum duration per measurement.
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Disconnect hose between intake manifold and recirculation valve at intake manifold and using T-piece, connect VAG 1397 A turbocharger tester.
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Select measuring range 1.
Notes:
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To operate turbocharger tester see operating instructions.
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Hoses must be connected so there is no possibility of leaks.
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Ensure pressure hose is not trapped between hood and body
CAUTION: Always use a second technician to take measurements via the VAG 1397A Turbo charger tester when driving on the road.
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Measure boost pressure at Wide Open Throttle
On a dynamometer:
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In 3rd gear or Transmission Range selection 2 between 3000 and 4000 rpm
On the road test drive:
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In 2nd gear or Transmission Range selection 1, accelerate vehicle at Wide Open Throttle and hold vehicle between 3000 and 4000 rpm by braking
at the same time
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Press memory button "M" on turbo tester and read display. Relative pressure specification: 1.350 to 1.650 bar
If specification exceeded:
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Test Wastegate Bypass Regulator valve N75
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Check to ensure that flow in hose from turbo to pressure unit (via valve) is not blocked when connector is pulled off.
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Ensure control valve pressure unit is securely mounted on turbo.
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Check charge pressure control valve shaft mounting in turbo for ease of movement.
If corroded together
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Replace turbocharger assembly
If boost pressure not attained:
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Check Wastegate Bypass Regulator valve N75.