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| The smaller of the two connectors on the engine control unit has the contacts 1 to 60. The larger of the two connectors has the contacts 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 relevant test procedure will state whether it is necessary to also connect the engine control unit to the test box. |
WARNING | To prevent irreparable damage to the electronic components, select appropriate measuring range before connecting the measuring cables and observe the test requirements. |
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| Connect test box -V.A.G 1598/42- to wiring harness with adapter cable -V.A.G 1598/39-1- or adapter cable -V.A.G 1598/39-2-. 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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| Interrogate event memory and erase if necessary. |
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Note
