Hydraulic Control Assembly - Antilock Brakes: Testing and Inspection

BRAKE CONTROL: BRAKE ACTUATOR (for 1UR-FSE): ON-VEHICLE INSPECTION

ON-VEHICLE INSPECTION

1. INSPECT BRAKE ACTUATOR ASSEMBLY OPERATION
(a) Pre-check preparation
(1) Move the shift lever to the P position. Apply the parking brake and connect the Techstream to the DLC3.
(2) Turn the engine switch on (IG).
(3) Turn on the Techstream. Select: Chassis / ABS/VSC/TRAC / Data List / Master Cylinder Sensor, Master Cylinder Sensor 2, FR W/C Sensor, FL W/C Sensor, RR W/C Sensor, and RL W/C Sensor.
(b) Check FR system solenoid (SLA**, SLR**, SMC1, SMC2)
(1) Select Active Test: Electronically Controlled Brake System Solenoid (SLAFR) valve close. Enter and check the output voltage.
NOTE:
Do not depress the brake pedal.
HINT:
- It takes approximately 35 seconds to complete the check.
- If incorrect, troubleshoot the brake system. Problem Symptoms Table

Standard voltage:






(c) Check FL system solenoid (SLA**, SLR**, SMC1, SMC2)
(1) Select Active Test: Electronically Controlled Brake System Solenoid (SLAFL) valve close. Enter and check the output voltage.
NOTE:
Do not depress the brake pedal.
HINT:
- It takes approximately 35 seconds to complete the check.
- If incorrect, troubleshoot the brake system. Problem Symptoms Table

Standard voltage:






(d) Check RR system solenoid (SLA**, SLR**, SMC1, SMC2)
(1) Select Active Test: Electronically Controlled Brake System Solenoid (SLARR) valve close. Enter and check the output voltage.
NOTE:
Do not depress the brake pedal.
HINT:
- It takes approximately 35 seconds to complete the check.
- If incorrect, troubleshoot the brake system. Problem Symptoms Table

Standard voltage:






(e) Check RL system solenoid (SLA**, SLR**, SMC1, SMC2)
(1) Select Active Test: Electronically Controlled Brake System Solenoid (SLARL) valve close. Enter and check the output voltage.
NOTE:
Do not depress the brake pedal.
HINT:
- It takes approximately 35 seconds to complete the check.
- If incorrect, troubleshoot the brake system. Problem Symptoms Table

Standard voltage:






(f) Check SMC1, SMC2
(1) Select: Chassis / ABS/VSC/TRAC / Electronically Controlled Brake Utility / Electronically Controlled Brake Invalid / enter Electronically Controlled Brake system Invalid to prohibit the brake control.
(2) Check that the brake warning light comes on.
(3) Select: Chassis / ABS/VSC/TRAC / Data List / Master Cylinder Sensor, Master Cylinder Sensor 2, FR W/C Sensor and FL W/C Sensor.
(4) Check the output voltage by depressing the pedal.
Standard voltage:
Difference in output voltage between "Master Cylinder Sensor" and "FR W/C Sensor" is less than 0.4 V.
Difference in output voltage between "Master Cylinder Sensor 2" and "FL W/C Sensor" is less than 0.4 V.
(5) Select: Chassis / ABS/VSC/TRAC / Electronically Controlled Brake Utility / Electronically Controlled Brake Invalid to cancel brake control prohibition (ELECTRONICALLY CONTROLLED BRAKE SYSTEM INVALID).
2. INSPECT PRESSURE SENSOR OPERATION
(a) Check battery voltage.
Standard voltage:
10 to 14 V (during engine stop)





(b) Connect the hydro booster pressure gauge and pedal effort gauge.
(1) Install the hydro LSPV gauge (SST) and brake pedal effort gauge.
SST: 09709-29018
(2) Bleed the air from the hydro booster pressure gauge.
(3) Move the shift lever to the P position. Connect the Techstream to the DLC3 with the parking brake applied.
(4) Turn the engine switch on (IG).
(5) Clear the DTC. Electronically Controlled Brake System
(c) Check the wheel cylinder pressure sensor and master pressure sensor.
(1) Turn on the Techstream. Select: Chassis / ABS/ VSC/TRAC / Data List / Master Cylinder Sensor, Master Cylinder Sensor 2, FR W/C Sensor, FL W/C Sensor, RR W/C Sensor, and RL W/C Sensor.
(2) Check the brake pedal effort gauge, hydro booster pressure gauge reading, and output pressure voltage.
If incorrect, troubleshoot the brake system. Problem Symptoms Table
Standard voltage:






















(d) Check the accumulator (ACC) pressure sensor
(1) Move the shift lever to the P position. Apply the parking brake and connect the Techstream to the DLC3.
(2) Turn the engine switch on (IG).
(3) Turn on the Techstream. Select: Chassis / ABS/ VSC/TRAC / Data List / the Accumulator Sensor.
(4) Temporarily operate the pump motor by depressing the brake pedal 4 or 5 times.
(5) After confirming that the pump motor stops, check the pressure output voltage.
Standard voltage:
2.6 to 3.8 V
If incorrect, troubleshoot the brake system. Problem Symptoms Table