Toyota Camry (XV70): Brake Actuator Operation Sound is Loud during Initial Check
CAUTION / NOTICE / HINT
NOTICE:
After replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and system information memorization.
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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 45 km/h (28 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 40 km/h (25 mph), the initial check of the brake actuator assembly is performed and pump motor operation sounds are generated.
| OK | .gif) | END |
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| 2. |
CHECK BRAKE ACTUATOR BOLT CUSHION |
(a) Check that the cushion of the brake actuator bracket assembly is not worn, damaged or deformed.
OK:
The brake actuator bracket assembly is not worn, damaged or deformed.
| NG | | REPLACE BRAKE ACTUATOR BOLT CUSHION |
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| 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.
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| 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 |
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DESCRIPTION The skid control ECU (brake actuator assembly) is connected to the combination meter assembly via CAN communication.
Pressing the VSC OFF switch turns off TRAC operation, and pressing an
Components
COMPONENTS ILLUSTRATION
*1 COWL SIDE TRIM SUB-ASSEMBLY LH
*2 FRONT DOOR OPENING TRIM WEATHERSTRIP LH
*3 FRONT DOOR SCUFF PLATE LH
*4 HOOD LOCK CONTROL LEVER SUB-A
SEE MORE:
Wheel Speed Sensor Signal Compare Failure (C124E62)
DESCRIPTION The skid control ECU (brake actuator assembly) measures the speed of each wheel by receiving signals from each speed sensor.
These signals are used for recognizing that all four wheels are operating properly.
Therefore, signals from all wheels must be equal.
DTC No. Detection
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Depending on the operating conditions, the master cylinder cut solenoid valves regulate the brake fluid pressure generated by the pump motor.
When this DTC is stored, the fail-s
