Hydraulic Control Assembly - Antilock Brakes: Testing and Inspection
BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: BRAKE ACTUATOR: ON-VEHICLE INSPECTION
1. CHECK BRAKE ACTUATOR OPERATION
(a) Move the shift lever to the P position. Apply the parking brake and connect the Techstream to the DLC3.
(b) Turn the power switch ON (IG).
(c) Turn on the Techstream.
(d) Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test / Actuator Air Bleeding Pattern / Data List / Master Cylinder Sensor, Master Cylinder Sensor 2, FR W/C Sensor, FL W/C Sensor, RR W/C Sensor, RL W/C Sensor.
(e) Turn on the Actuator Air Bleeding Pattern test, and check the solenoid (SLA##, SLR##, Electronically Controlled Brake System Solenoid (SMC1), Electronically Controlled Brake System Solenoid (SMC2)).
NOTICE:
Do not depress the brake pedal.
HINT
* It takes approximately 70 seconds to complete the check.
* The sensors will be checked one by one within the 70 second time period.
* If incorrect, troubleshoot the brake system Problem Symptoms Table.
(1) Check the FR W/C Sensor output voltage.
Standard voltage:
(2) Check the FL W/C Sensor output voltage.
Standard voltage:
(3) Check the RR W/C Sensor output voltage.
Standard voltage:
(4) Check the RL W/C Sensor output voltage.
Standard voltage:
(f) Check the changeover solenoid valves (SMC1, SMC2).
(1) Enter the following menus: 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 control warning light comes on.
(3) Enter the following menus: 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 brake 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) Enter the following menus: Chassis / ABS/VSC/TRAC / Electronically Controlled Brake Utility / Electronically Controlled Brake Invalid / and cancel brake control prohibition (Electronically Controlled Brake Invalid).
2. CHECK PRESSURE SENSOR OPERATION
(a) Check the battery voltage.
Standard voltage:
11 to 14 V (with the engine stopped)
(b) Connect a hydro LSPV gauge (SST) and pedal effort gauge.
(1) Install a hydro LSPV gauge (SST) and brake pedal effort gauge.
SST : 09709-29018
Text in Illustration
(2) Bleed air from the LSPV gauge (SST).
(3) Move the shift lever to P. Connect the Techstream to the DLC3 with the parking brake applied.
(4) Turn the power switch on (IG).
(5) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(c) Check the wheel cylinder pressure sensor and master pressure sensor.
(1) Turn the Techstream on.
(2) Enter the following menus: 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.
(3) Check the brake pedal effort gauge and the LSPV gauge (SST) readings, and the output voltage.
Standard Result:
Standard Result:
Standard Result:
Standard Result:
Standard Result:
If the result is not as specified, troubleshoot the brake system Problem Symptoms Table.
(d) Check the accumulator sensor.
(1) Move the shift lever to P. Apply the parking brake and connect the Techstream to the DLC3.
(2) Turn the power switch on (IG).
(3) Turn the Techstream on.
(4) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List / Accumulator Sensor.
(5) Temporarily operate the pump motor by depressing the brake pedal 4 or 5 times.
(6) After confirming that the pump motor stops, check the output voltage.
Standard voltage:
2.6 to 3.8 V
If the result is not as specified, troubleshoot the brake system Problem Symptoms Table.