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Testing electronic engine power control (electronic throttle)
Testing throttle valve control part -J338
The housing for the throttle valve control part contains the following components (the housing must not be opened):
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‒ Throttle valve drive -G186
(This is an electric motor activated by the engine control unit. The motor opens the throttle valve by applying force to overcome the spring pressure.)
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‒ Angle sender for throttle valve drive -G187
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‒ Angle sender 2 for throttle valve drive -G188
Note:
The angle senders are in the form of potentiometers (variable resistors). Each sends its own separate signal to inform the engine control unit of the position of the throttle valve (i.e. one of the signals is redundant).
The potentiometers cannot be adjusted mechanically. Adaption can be performed using the basic setting function (function 04) with vehicle diagnostic, testing and information system VAS 5051 or with fault reader V.A.G 1551 or 1552.
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