| Testing throttle valve control unit -J338- |
| The housing of the throttle valve control unit - J338- contains the following components: |
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| Throttle valve drive -G186-. This is an electric motor driven by the engine control unit. This electric motor opens the throttle valve against a spring force. |
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| Angle sender 1 for the throttle valve drive -G187 - |
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| Angle sender 2 for the throttle valve drive -G188 - |
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| The housing of the throttle valve control unit - J338- must not be opened. |
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| The angle senders are designed a potentiometers (variable resistors). They indicate the position of the throttle valve to the engine control unit fully independently from one another. |
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| The potentiometers cannot be mechanically adjusted. The settings are carried out when initiating the basic setting (function 04) using the vehicle system tester -V.A.G 1552-. |
| Special tools and workshop equipment required |
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| Vehicle system tester -V.A.G 1552- |
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| Diagnostic cable -V.A.G 1551/3, 3A, 3B oder 3C- |
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| Hand multimeter (e.g. -V.A.G 1715-) |
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| Adapter cable set (e.g. -V.A.G 1594 A- or -V.A.G 1594 C-) |
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| Test box -V.A.G 1598/31- |
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