Circuit Operation

ABS-ECU contains the power supply circuit (terminal No. 26) for the solenoid valve. The solenoid valve is energized by the valve relay, which is incorporated in ABS-ECU.
The valve relay, which is incorporated in ABS-ECU, is always energizing the solenoid valve unless the initial check is in progress when the ignition switch is turned on, or the recurrent system check is in progress.