Audi V6 BITURBO Manual page 39

Subsystems of the Motronic
throttle valve control part J338 with throttle valve drive G186, angle
senders 1 G187 and 2 G188 for throttle valve drive
The throttle valve control part comprises...
... throttle valve housing with throttle valve
... throttle valve drive G186 with reduction
gear
... angle senders for throttle valve drive
G187 and G188
Activated by the engine control unit, the
throttle valve drive controls the air-flow rate
necessary to develop the required torque.
Feedback on momentary throttle valve
position is provided by two potentiometers
G187 and G188.
Throttle valve drive G186
(Electric throttle control)
Throttle valve housing
with throttle valve
SSP 198/28
40
Angle senders for throttle valve
drive G187 and G188
For safety reasons, two angle senders
(redundancy) are used. They have opposite
impedance characteristics (see diagram).
If an angle sender fails, the second sender
maintains the electronic accelerator function
via an emergency running program.
Angle senders G187 and G188 cannot
be replaced separately. The throttle
valve control part may not be opened.
Redundancy means: superfluous,
non-essential.
0
Throttle valve opening in %
Housing cover with electrical
connections
SSP 198/27
G188
G187
100%