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| The smaller of the two connectors in the engine control unit has terminals 1 to 60. The larger of the two connectors has terminals 1 to 94. |
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| The test box -V.A.G 1598/42- is designed so 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 instructions for performing the individual tests indicate whether or not the engine control unit itself also needs to be connected to the test box. |
| The engine control unit has to be removed so that the connectors from engine control unit can be unplugged → Chapter. |
WARNING | To prevent damage to the electronic components, select appropriate measuring range before connecting the measuring cables and observe the test requirements. |
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| Connect the test box -V.A.G 1598/42- using the adapter cable -V.A.G 1598/39-1- or the adapter cable -V.A.G 1598/39-2- to the wiring harness. Connect earth clip of test box to negative terminal of battery. The instructions for performing the individual tests indicate whether or not the engine control unit itself also needs to be connected to the test box. |
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| Carry out test as described in appropriate repair procedures. |
| Installing engine control unit |
| Installation is performed in the reverse sequence; the engine control unit must be installed with the protective housing. New shear bolts must be used. |
| Perform the following after reconnecting engine control unit: |
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| Consult the event memory and erase if necessary. |
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Note
