TPS doesn't do anything to fuel mapping on a carburetted bike, because it can't. Only thing TPS, on a carburetted bike, controls is the ignition map. On a carburetted engine fuel mapping is done by the following parts of the carburettor - Pilot jet, slide cutaway, needle jet, jet needle and main jet.
What TPS does is it will help the CDI to chose an optimal ignition map based on Engine RPM and throttle opening. Without TPS the CDI choses ignition timing according to Engine RPM. Throttle Position Sensor (TPS) is the eye of the CDI. TPS helps the CDI to see how much the throttle is opened for that given engine RPM and chose the best map.
There is no ECU in the GS150R or any other bike for that matter, except the fuel injected bikes - RTR Fi, P220 and Glamour Fi. ECU you refer to is only a CDI/TCI/IDI ignition system.
Eco and Pwr modes are two different ignition maps.
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