| Checking function of freewheel lock |
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| A second mechanic is required to test freewheel lock. |
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| Run engine for about 30 seconds to develop vacuum for control element. |
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| Turn rear wheels forwards and backwards. |
| The front wheels must be driven in both directions by the propshaft. |
| When wheels are turned forwards, the freewheel lock engages audibly immediately. |
| If rear wheels can be turned forwards without resistance, the following defects could be the cause: |
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| Lines, hoses and connections |
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| Non-return valve and vacuum reservoir (in engine compartment) |
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| Check for leaks using hand-operated vacuum pump -V.A.G 1390-. |
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| Diaphragm in control unit |
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| Check wiring and components for short circuit and open circuit using current flow diagram. |
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| Check solenoid switch in control element (must pull audibly when ignition is switched on). |
| If pneumatic and electrical systems are OK, then the mechanical freewheel lock or the freewheel itself must be defective. To repair, dismantle rear final drive → Chapter. |
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