Electronic Control Unit
The control unit receives voltage from the voltage supply relay (No. 29). It also has inputs from ignition system (to determine idle speed), a coolant sensor, air injection system and fuel injection feedback control unit. It provides an output signal to idle speed adjuster which varies from 1 to 5 volts, at a frequency of 200 cycles per second.
NOTE:
The electronic control unit is located in a sealed box in front of cowl air intake grille.