TT L4-1.8L Turbo (BEA) (2004)
Differential Clutch: Testing and Inspection
Haldex coupling, checking function
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Drive vehicle front wheels onto rolling road.
WARNING!: Ensure area in front of vehicle is kept free. Carry out test with care to avoid damage.
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Engage 1st gear and slowly start driving.
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If the vehicle is not pushed off the rolling road at an engine speed of 1500 rpm, then the Haldex coupling is not OK.
Notes:
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When driving the front wheels while the rear wheels are stationary the Haldex coupling will lock - up. This means that the rear wheels are then
driven.
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The Haldex coupling will accept differing speeds for a short period without locking up, when 1st gear is engaged and engine speed is slightly
above idling speed.