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With Motronic ME 7.5, there is no longer a
mechanical throttle control cable between the
accelerator pedal and throttle valve. This has
been replaced by an electronic control unit
(drive-by-wire).
The driver input at the accelerator pedal is
registered by the accelerator position sender
and transmitted to the engine control unit.
Electrically actuated throttle valve
(electronic throttle control function)
The system comprises the following compon-
ents:
– Accelerator position sender
– Engine control unit
– Throttle valve control unit
Accelerator position sender
Safety module
Throttle valve control
unit J338
The engine control unit positions the throttle
valve via an electric motor. The engine control
unit is provided with continuous feedback on
the throttle valve position.
Extensive safety measures have been imple-
mented in the hardware and software. For
example, dual senders, a safety module and a
self-monitoring processor structure are inte-
grated in the electronic throttle control
function.
Input signals
Output signals
Angle senders for
throttle valve drive
G187 and G188
Accelerator pedal posi-
tion senders G79 and
G185
Engine control unit
CPU*
Throttle valve
drive G186
SSP207/99
* Control Processing Unit
