DTC C1073 Faulty motor drive circuit: Operation

ASC-ECU contains the power supply circuit (terminal No. 1) for the pump motor. The pump motor is energized by the motor switch, which is incorporated in ASC-ECU.
The pump motor switch, which is incorporated in ASC-ECU, is always off unless the motor solenoid valve check is activated when the vehicle is started.
ASC-ECU activates the pump motor by turning on the ECU built-in pump motor switch.