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| If, according to the circuit diagram, the cable leads to the 94-pin connector,connect the larger of the two connectors of the adapter -VAG 1598/39-2- as shown below. The connector marked with „A“ should be connected to entrance „A“ of the test box -VAG 1598/42- and connector „B“ to entrance „B“ of thetest box -VAG 1598/42-. |
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| The test box -VAG 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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| This has the advantage that, when the test box is connected, the electronic engine control remains totally operative (for example, measurement of signals with the engine running). |
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| If the engine control unit should also be connected to the test box, this is indicated in the corresponding test cycles. |
WARNING | Before connecting the measuring cables, select the appropriate measurement field and follow the test procedures to avoid damaging electronic components. |
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| Connect test box -VAG 1598/42- to wiring harness connectors. The earth lead from the test box should be connected to the battery negative. If the engine control unit should also be connected to the test box, this is indicated in the corresponding test cycles. |
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| Carry out the verification as described in the corresponding repair process. |
| After reconnecting the engine control unit, perform the following operations: |
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| Interrogating and erasing fault memory if necessary → Chapter. |
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Note
