| 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-. The 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 throttle valve drive -G187- |
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| Angle sender 2 for 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). The senders indicate the position of the throttle valve on the engine control unit fully independently from one another. |
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| The potentiometers cannot be mechanically adjusted. The setting is undertaken with the vehicle system tester -V.A.G 1552- in function 04 “Initiate basic setting”. |
| Special tools and workshop equipment required |
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| Vehicle system tester -V.A.G 1552- with cable -V.A.G 1551/3, 3A, 3B nebo 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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| The throttle valve must neither be damaged nor dirty |
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| Coolant temperature must be at least 80 °C |
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| The functional test of the throttle valve control unit -J338- can be carried out via the function “Read measured value block”, display group 062 → Chapter. |
| If the specified values are not reached: |
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| Disconnect the plug from the throttle valve control unit -J338- → Chapter. |
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