When current flows through the fuel pump relay, the relay turns ON and the fuel pump is
driven. The fuel pump relay is built into the ETACS-ECU. When the ignition switch-ST signal
is input, engine-ECU turns ON the power transistor for control of the fuel pump relay. As a
result, power is supplied to the fuel pump. Also, if engine speed falls below a set value, the
fuel pump relay is turned OFF. Thus, it deals with sudden stoppages such as engine stalling
etc. by stopping the pump.
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