ON-VEHICLE INSPECTION CAUTION / NOTICE / HINT NOTICE: DTCs may be stored during the inspection procedure. Be sure to clear the DTCs and check that no DTCs are output after the inspection is finished. PROCEDURE 1. INSPECT PRESSURE SENSOR (a) Check auxiliary battery voltage. Standard Voltage: 11 to 14 V (while the power switch is off) (b) Set a pedal effort gauge and SST, and connect the Techstream.
(2) Connect the Techstream to the DLC3 with the power switch off, the shift lever in P and the parking brake applied. (3) Turn the power switch on (IG) and turn the Techstream on. (4) Bleed air from SST (LSPV gauge). Click here (c) Inspect the reaction force pressure and servo pressure. (1) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List / Reaction Force Pressure and Servo Pressure. Chassis > ABS/VSC/TRAC > Data List
(2) Check the value output from "Reaction Force Pressure" and "Servo Pressure" by depressing the brake pedal. Standard Result:
Standard Result:
(d) Remove the pedal effort gauge and SST. (1) Remove the pedal effort gauge and SST, and bleed the brake line. Click here (e) Inspect the accumulator pressure. (1) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List / Accumulator Pressure and MT Voltage Value. Chassis > ABS/VSC/TRAC > Data List
(2) While fully depressing the brake pedal 4 or 5 times, check that the MT voltage value is 10 V or more once or more. HINT: Usually the MT voltage value is 0 V. (3) After confirming that the booster pump motor stops, check the accumulator pressure. Standard Result: 15 to 21 MPa 2. INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (a) Check auxiliary battery voltage. Standard Voltage: 11 to 14 V (while the power switch is off) (b) Set a pedal effort gauge and SST, and connect the Techstream.
(2) Connect the Techstream to the DLC3 with the power switch off, the shift lever in P and the parking brake applied. (3) Turn the power switch on (IG) and turn the Techstream on. (4) Clear the DTCs. Click here (5) Bleed air from SST (LSPV gauge). Click here (c) Check operation without the brake booster. (1) Inspect and adjust the brake pedal height. Click here
(3) Turn the Techstream on and enter the following menus: Chassis / ABS/VSC/TRAC / Utility / ECB (Electronically Controlled Brake system) Utility. Chassis > ABS/VSC/TRAC > Utility
(4) Select "Motor Invalid" on the "ECB (Electronically Controlled Brake system) Utility" screen. (5) Perform "Motor Invalid" according to the display on the Techstream. (6) Depress the brake pedal 40 times or more to return all the fluid in the accumulator back to the reservoir. HINT: A buzzer may sound due to low accumulator pressure. As this is not a malfunction, continue the procedure. (7) Check that the brake pedal is firm. (8) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List / Stroke Sensor and Stroke Sensor 2. Chassis > ABS/VSC/TRAC > Data List
(9) Check the values output from "Stroke Sensor" and "Stroke Sensor 2" by depressing the brake pedal. Standard Result:
Standard Result:
(10) Remove the pedal effort gauge and SST, and bleed the brake system. Click here (11) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List / Accumulator Pressure, and check the output pressure. Chassis > ABS/VSC/TRAC > Data List
Standard Result: 15 to 21 MPa (12) Clear the DTCs. Click here
3. INSPECT STROKE SIMULATOR (a) Check auxiliary battery voltage. Standard Voltage: 11 to 14 V (while the power switch is off) (b) Connect the Techstream and set a pedal effort gauge. (1) Set a pedal effort gauge. (2) Connect the Techstream to the DLC3 with the power switch off, the shift lever in P and the parking brake applied. (3) Turn the power switch on (IG) and turn the Techstream on. (4) Clear the DTCs. Click here (c) Check operation with the brake booster. (1) Turn the power switch on (IG). (2) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List / Stroke Sensor and Stroke Sensor 2. Chassis > ABS/VSC/TRAC > Data List
(3) Depress the brake pedal 4 or 5 times. (4) Check the values output from "Stroke Sensor" and "Stroke Sensor 2" by depressing the brake pedal. Standard Voltage:
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Front Camera System(for Gasoline Model): Lost Communication with ECM / PCM "A" (U0100,U0101,U0123,U0129,U0142)
DESCRIPTION When a malfunction is detected between various ECUs and sensors, these DTCs are stored. DTC No. Detection Item DTC Detection Condition Trouble Area U0100 Lost Communication with ECM / PCM "A" While the vehicle is being driven at 1 km/h or 1 mph or more, a communication error between the ...
