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Checking electronic engine power control (electronic throttle)
Checking throttle valve control unit -J338
The following components are located in the housing of the throttle valve control unit.
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◆ Throttle valve drive -G186 (This is an electric motor which is activated by the engine control unit. This electric motor opens the throttle valve against the force of a spring).
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◆ Angle sensor 1 for throttle valve drive -G187
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◆ Angle sensor 2 for throttle valve drive -G188
Notes:
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◆ Housing of throttle valve control unit must not be opened.
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◆ The angle sensors are in the form of potentiometers (variable resistances). They provide the position of the throttle valve to the engine control unit completely independently of one another.
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◆ The potentiometers cannot be adjusted mechanically. The settings are made as part of basic setting (function 04) using the vehicle diagnosis, measurement and information system VAS 5051 or the fault reader V.A.G 1551.
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