Hydraulic Control Assembly - Antilock Brakes: Testing and Inspection

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: BRAKE ACTUATOR: ON-VEHICLE INSPECTION

1. CONNECT TECHSTREAM

(a) Warm up the engine.

(b) Turn the engine switch off.

(c) Connect the Techstream to the DLC3.

(d) Turn the engine switch on (IG).

(e) Turn the Techstream on.

(f) Enter the following menus: Chassis / ABS/VSC/ TRAC / Active Test.

HINT
Refer to the Techstream operator's manual for further details.

2. INSPECT ACTUATOR MOTOR OPERATION

NOTICE:
Do not keep the motor relay on continuously for more than 5 seconds. If it needs to be operated repeatedly, set an interval of more than 20 seconds between operations.

(a) Enter the following menus: Chassis / ABS/VSC/ TRAC / Active Test / Motor Relay.

(b) Turn the motor relay on and check for actuator motor operation noise.

HINT
If the operation noise cannot be heard, replace the brake actuator assembly because the motor operation is abnormal.

(c) Turn the motor relay off.

(d) Fully depress the brake pedal and hold it for approximately 15 seconds. Check that the pedal's initial depth is maintained for the entire 15 seconds.

(e) With the pedal still depressed, turn the motor relay on and check that the pedal does not pulsate.

(f) Turn the motor relay off and release the brake pedal.

3. INSPECT FRONT RIGHT WHEEL OPERATION

NOTICE:
Do not turn on a solenoid in a manner different than that shown in the following steps.

(a) Enter the following menus: Active Test / ABS Solenoid.

(b) Depress the brake pedal and hold it.

(c) Turn the SFRH and SFRR solenoids on simultaneously, and check that the pedal cannot be depressed.

NOTICE:
Each solenoid operates for 2 seconds and turns off automatically. If it needs to be operated repeatedly, set an interval of more than 20 seconds between operations.

(d) Turn the SFRH and SFRR solenoids off simultaneously, and check that the pedal can be depressed.

(e) With the pedal still depressed, turn the motor relay on and check that the pedal returns.

NOTICE:
Do not keep the motor relay on continuously for more than 5 seconds. If it needs to be operated repeatedly, set an interval of more than 20 seconds between operations.

(f) Turn the motor relay off and release the brake pedal.

4. INSPECT OTHER WHEEL OPERATION

(a) Using the same procedure, check the solenoids of the other wheels.

HINT
* Front left wheel: SRRH, SFLR
* Rear right wheel: SRRH, SRRR
* Rear left wheel: SRLH, SRLR