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| The test box -V.A.G 1598/31- is designed so that it can be connected both to the wiring harness for the engine control unit and to the engine control unit itself at the same time. |
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| The advantage of this is that the electronic engine control system remains fully functional when the test box is connected (for example, for measuring signals when the engine is running). |
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| The relevant test procedure will state whether it is necessary to also connect the engine control unit to the test box. |
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Note
