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| The adapter cable, 121-pin -V.A.G 1598/31- (test box) is designed for simultaneous connection to the wiring harness leading to the engine control unit and to the engine control unit itself. |
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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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| Always use auxiliary measuring set -V.A.G 1527 B- to connect test equipment (e.g. voltage tester -V.A.G 1526 C-, hand-held multimeter -V.A.G 1594 C- etc.). |
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| If the engine control unit is bolted to the protective housing, housing must be separated from engine control unit for connection of test box. Procedure → Chapter. After completing repair work, protective housing must be fitted back on engine control unit. |
| The engine control unit has to be removed before connectors can be unplugged from engine control unit → Chapter. |
Caution | To prevent damage to electronic components, select appropriate measuring range before connecting measuring leads and observe test requirements. |
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Note
