Primarily handles core engine functions like fuel injectors, ignition coils, and primary sensors (MAP, TP, Crank). Connector B (Auxiliary/Outputs):
Unlike older B/K series engines, the FN2 (RSP ECU) uses a throttle body. The TPS signal (Pin B23) comes from the pedal position sensor (APP), not the throttle plate. Do not try to run a cable throttle on this ECU without serious modification.
