When inspecting the brake actuator operation,


it is difficult to perform the test while actually driving, so the following method is used to generate simulated signals to simulate and inspect the ABS operation condition.

(1) When using the SST

Connect the SST and brake actuator using the harness on the SST side and harness on the vehicle side as shown in the illustration at left. The SST sends a simulated signal to the brake actuator causing the actuator to operate, so perform the brake actuator inspection.

(2) When using the hand-held tester

Connect the hand-held tester to the DLC3.

Use ACTIVE TEST to operate the brake actuator and then inspect the brake actuator.

Types of Brake Actuator Hydraulic Circuit

The brake actuator has the following types.

1. 2-position solenoid valve (4) with flow control valve (4) The flow control valve is mechanically operated (operates without a direct instruction from the ECU) to control the hydraulic pressure of each brake.

2. 2-position solenoid valve (6) with pressure increase valve (2) The pressure increase valve mechanically operates to control the hydraulic pressure of the rear brake together with the rear solenoid valve.

3. 3-position solenoid valve (3) with mechanical valve (1) The mechanical valve operates to control the hydraulic pressure of the right and left rear brakes. (A mechanical valve is used when there is diagonal piping.)

4. 3-position solenoid valve (4) The 3-position solenoid valve controls the hydraulic pressure of each brake based on the signal from the ECU.

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