It can override the cable because the throttle is driven by a motor. The only mechanical link is the LAST 1/4 of travel for limp mode.
It calculates what goes in and then uses a motor inside of the housing to apply throttle.
I know it sounds weird, but take my word for it.
I have only seen the overvoltage relay and the fuel pumps fail, not the fuel pump relays too much on the c280/
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