A8 Quattro Sedan V8-4.2L (AUX) (2001)
Electronic Throttle Control Module: Testing and Inspection
Throttle Valve Control Module-J338, Checking
The housing for the throttle valve control part contains the following components (the housing must not be opened):
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Throttle drive -G186 (power accelerator actuation) (This is an electric motor activated by the engine control module. The motor opens the throttle
valve by applying force to overcome the spring pressure.)
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Angle sensor -1- for throttle drive (power accelerator actuation) -G187
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Angle sensor -2 for throttle drive (power accelerator actuation) -G188
NOTE:
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The angle sensors are in the form of potentiometers (variable resistors). Each sends its own separate signal to inform the engine control module of
the position of the throttle valve (i.e. one of the signals is redundant).
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The potentiometers cannot be adjusted mechanically. Settings are made using the "Basic Setting" function (function 04) with vehicle diagnostic,
testing and information system VAS5051 or with VAG1551 scan tool.