| Checking open Haldex coupling for function on vehicles with direct shift gearbox |
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| Oil level of Haldex coupling OK |
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| Checking oil level in Haldex coupling → Chapter. |
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| Correct engine control unit and ABS control unit installed (check coding and control unit identification number). |
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| Place vehicle on lifting platform. |
Caution | For safety reasons it is essential that the wheels do not touch the ground when the vehicle is on the lifting platform. |
| Carry out test with care to avoid damage. |
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| Select gear D and operate accelerator pedal slightly. |
| All four wheels must turn. |
| The rear wheels must stop turning and the front wheels must continue to turn. |
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| If the rear wheels do not turn: |
| The Haldex coupling is open; function is OK. |
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| If the rear wheels turn: |
| The Haldex coupling is closed. Possible cause of fault: |
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| Main pressure regulating valve sticking |
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| Mechanical fault in Haldex coupling |
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| Four-wheel drive control unit -J492- at rear final drive defective |
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| Handbrake warning switch -F9- defective |
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