Service & Repair Manual

24-134
Electronic engine power
control (E-Gas), checking
E-Gas system, function
For E-Gas, the throttle valve is not operated by a
cable from the accelerator pedal. There is no
mechanical connection between the accelerator
pedal and the throttle valve.
The position of the accelerator pedal is
communicated to the Engine Control Module
(ECM) via two sensors for accelerator pedal
position (variable resistances; stored in one
housing) that are connected with the accelerator
pedal.
The accelerator pedal position (driver's intention)
is a main input unit for the ECM.
Operation of the throttle valve occurs via an
electric motor (throttle valve actuator) in the
throttle valve control module. This is true across
the entire engine speed and engine load
spectrum.
The throttle valve is operated by the throttle valve
actuator according to the instructions of the
ECM.
With ignition switched on and engine off, the
ECM activates the throttle valve actuator
precisely according to the sensor for accelerator
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