Toyota Yaris: Vehicle Stability Control System / Brake Actuator Operation Sound is Loud during Initial Check
CAUTION / NOTICE / HINT
NOTICE:
After replacing the skid control ECU (brake actuator assembly), perform "Calibration".
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PROCEDURE
| 1. | PERFORM ROAD TEST |
(a) After turning the ignition switch to ON, compare the operating sound of the brake actuator the first time the vehicle speed reaches approximately 25 km/h (16 mph) with a known good vehicle of the same model.
OK:
The operating sound is the same or quieter than that of a known good vehicle of the same model.
HINT:
When the vehicle speed reaches approximately 20 km/h (12 mph), the initial check of the brake actuator assembly is performed and pump motor operation sounds are generated.
| OK |
 | END |
|
| 2. | CHECK BRAKE ACTUATOR BRACKET CUSHION |
(a) Check that the cushion of the brake actuator bracket assembly is not worn, damaged or deformed.
OK:
The cushion of the brake actuator bracket assembly is not worn, damaged or deformed.
| NG |
 | REPLACE BRAKE ACTUATOR BRACKET CUSHION |
|
| 3. | ADJUST INSTALLATION OF BRAKE ACTUATOR ASSEMBLY |
(a) Drain the brake fluid.
(b) Disconnect all brake lines from the brake actuator assembly.
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(c) Connect each brake line so that the cushion of the brake actuator assembly is tensioned evenly.
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NOTICE:
After connecting all the brake lines, add brake fluid and bleed the brake system.
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HINT:
By reducing the tension on the brake lines and cushion, the operating sound of the brake actuator assembly may be reduced.
(d) Check that no brake lines interfere the vehicle body or other components.
|
| 4. | RECHECK SYMPTOM |
(a) Perform a road test and check the magnitude of the operating sound again.
OK:
The operating sound is the same or quieter than that of a known good vehicle of the same model.
| OK |
 | END |
| NG |
 | REPLACE BRAKE ACTUATOR ASSEMBLY |
VSC does not Operate or VSC does not Operate Correctly
DESCRIPTION When TRC or VSC is operating, the skid control ECU (brake actuator assembly) blinks the slip indicator light to inform the driver that slippage occurred...
VSC OFF Switch Circuit
DESCRIPTION Operating the VSC OFF switch (combination switch assembly) makes it possible for TRC and/or VSC operation to be prohibited. Pressing the VSC OFF switch (combination switch assembly) changes to TRC OFF mode, and turns off TRC operation...
Other information:
Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Disassembly
DISASSEMBLY PROCEDURE 1. REMOVE INPUT SHAFT REAR BEARING SHAFT SNAP RING (a) Using a snap ring expander, remove the input shaft rear bearing shaft snap ring from the input shaft. 2. REMOVE INPUT SHAFT REAR RADIAL BALL BEARING (a) Using SST, remove the input shaft rear radial ball bearing from the input shaft...
Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Lost Communication With Brake System Control Module(ch2) Missing Message (U117087)
DESCRIPTION The brake actuator assembly communicates with the ECM and engine stop and start ECU. When the brake actuator assembly does not receive data from the engine stop and start ECU, the engine stop and start ECU stores DTC U117087. DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from U117087 Lost Communication With Brake System Control Module(ch2) Missing Message No communication from the brake actuator assembly continues...
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Turning the Engine Off
Stop the vehicle completely. Manual transaxle: Shift into neutral and set the parking brake.Automatic transaxle: Shift the selector lever to the P position and set the parking brake.
Press the push button start to turn off the engine. The ignition position is off.