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Service. Self Study Programme 210 Electronic Power Control Design and Function With the Electronic Power Control system, the By positioning the throttle valve, the engine con throttle valve is actuated only by an electric trol unit can regulate engine torque even if the motor. driver has not depressed the accelerator pedal. This eliminates the need for a Bowden cable between the accelerator pedal and the throttle The result is better co ordination between and valve. within the engine management systems. It means that the driver input is relayed to the engine control unit via the accelerator pedal. The engine control unit then sends a correspond ing command to the throttle valve positioner. We will now demonstrate that the Electronic Power Control is more than just a substitute for the Bowden accelerator cable. New Important Note The Self Study Programme Please always refer to the relevant Service Literature is not a Workshop Manual. for all inspection, adjustment and repair instructions. Service literature. 2 Table of contents Introduction 4 Throttle valve positioning 4 System description . 5 Control process 6 System design . 7 What happens and when 8 System components 10 System overview 10 The engine control unit . 11 The accelerator pedal module 14 The throttle valve control unit . 16 The fault indicator lamp 22 Auxiliary signals 23 Function diagram 25 Self diagnosis . 26 Test your knowledge . 30 3 Introduction Throttle valve positioning 210 008 210 007 Mechanical throttle valve positioning system Electric throttle valve positioning system With this system, the driver depresses the accel With this system, the throttle valve is positioned erator pedal and thus positions the throttle valve by an electric motor across the full adjustment mechanically by means of a Bowden cable. range. When the driver depresses the accelerator pedal, the engine management syst