C1147, C1148, C1149, C1150 USV/HSV LINE

Description

USV1, USV2 (CUT VALVE)
The cut valve shuts off the normal brake fluid path from the master cylinder, when VDC/TCS is activated.

HSV1, HSV2 (SUCTION VALVE)
The suction valve supplies the brake fluid from the master cylinder to the pump, when VDC/TCS is activated.

DTC Logic

DTC DETECTION LOGIC

1. Turn ignition switch OFF and disconnect ABS actuator and electric unit (control unit) connector E26, check terminal for deformation, disconnection, looseness, and so on. If any malfunction is found, repair or replace terminal.
2. Reconnect connector and perform self-diagnosis. Is the Inspection result normal?

YES >> Inspection end.
NO >> GO TO 2
2.CHECK SOLENOID, VDC CHANGE-OVER VALVE AND ACTUATOR RELAY POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF and disconnect ABS actuator and electric unit (control unit) connector E26.

2. Check voltage between ABS actuator and electric unit (control unit) harness connector E26 terminal 3 and ground.

• Repair or replace malfunctioning components.
• Perform the self-diagnosis, and make sure that the result shows "NO DTC IS DETECTED".

3. CHECK SOLENOID, VDC CHANGE-OVER VALVE, ACTUATOR RELAY GROUND CIRCUIT

• Replace ABS actuator and electric unit (control unit). Refer to See: Brakes and Traction Control\Antilock Brakes / Traction Control Systems\Hydraulic Control Assembly - Antilock Brakes\Service and Repair\VDC/TCS/ABS\Removal And Installation.
• Perform the self-diagnosis, and make sure that the result shows "NO DTC IS DETECTED". NO >>
• Repair or replace malfunctioning components.
• Perform the self-diagnosis, and make sure that the result shows "NO DTC IS DETECTED".

Component Inspection
1.CHECK ACTIVE TEST

1. Select each test menu item on "ACTIVE TEST".
2. On the display, touch "UP", "UP", and "KEEP", and check that the system operates as shown in the table below.

NOTE:
The example shown is for front right wheel. The procedure for the other wheels is the same as given below.