Possibly. Who knows. All I can deduce from the wiring diagram is that the subject unit I refer to as an ICU -ignition control unit-is only controlling ignition. Not the engine perse, not the other electronics, nothing else bar ignition
For example, an ECU on a given vehicle might control alarm,immobilser, instrumentation, RPM, braking, auto transmission, warnings, speed (limp mode) Etc etc so in that context... not limited to engine only, hence Electronic Control Unit / module.