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The amount of power the engine is capable of producing isn't altered, but the engine control module does control the throttle itself. This has been the case ever since the demise of CIS-E injection back in the early to mid 90's, depending on the engine.
"4WD" is not a possility on an ETS-4 vehicle, as ETS-4 is an AWD system. I don't believe the engine controller on an ETS-4 even knows when it's put into low range.
Mainly, the engine control unit will alter the throttle setting based on info from the ETS-4 control unit, which is only acting upon info from the 4 wheel speed sensors. It also of course alters the throttle opening to control idle, to accelerate/decelerate in response to drivers commands, and also cruise control inputs, there is no seperate cruise control module anymore.
Gilly
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