Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Electronically Controlled Brake System: Precaution
| System Name | See Procedure |
|---|---|
| Navigation System (for DVD) | INITIALIZATION |
| Advanced Parking Guidance System | |
| Power Trunk Lid System | |
| Rear Door Sunshade System |
- TROUBLESHOOTING PRECAUTIONS
- When there is a malfunction with terminal contact points or a problem with part installation, removal and installation of the suspected problem parts may return the system to the normal condition either completely or temporarily.
- In order to determine the malfunctioning area, be sure to check the conditions at the time the malfunction occurred, such as DTC output and the freeze frame data, and record it before disconnecting each connector or removing and installing parts.
- Since this system may be influenced by malfunctions in systems other than the brake control system, be sure to also check for DTCs in other systems.
- HANDLING PRECAUTIONS
- Do not remove or install the electronically controlled brake system parts such as the steering angle sensor, yaw rate sensor or brake pedal stroke sensor except when required, as they need to be adjusted correctly after removal and installation.
- Be sure to complete preparation before work and confirmation after work by following the directions in the repair manual when working on the electronically controlled brake system.
- Be sure to remove and install the skid control ECU, brake actuator, brake accumulator pump, each sensor, etc. with the engine switch off unless otherwise specified in the inspection procedure.
- Be sure to remove the 2 main relays before removal and installation, or replacement of the electronically controlled brake system parts.
- The removal and installation of the brake actuator, brake accumulator pump, master cylinder or stroke simulator as well as other procedures can cause the fluid level to drop below the fluid reservoir port. If this happens when performing such work, be sure to remove the 2 connectors of the brake accumulator pump before the bleeding of the air in the pipeline is completed.
HINT:
- When the pump motor is operated with the air in the brake actuator hose, bleeding of the air becomes difficult due to the air in the actuator.
- The skid control ECU may operate the stroke simulator and drive the pump motor even when the engine switch is turned off.
- Even with the engine switch turned off, the skid control ECU can be operated for 2 minutes after the brake operation is finished.
- When removing the main relay and motor relay:
- With the engine switch off and the driver door closed, wait for 2 minutes without depressing the brake pedal. Make sure the brake control system is off. Then remove the 2 relays.
HINT:
Just before the brake control system turns off, the pump motor will operate for several seconds to prepare for its next operation.
- With the engine switch off and the driver door closed, wait for 2 minutes without depressing the brake pedal. Make sure the brake control system is off. Then remove the 2 relays.
- When removing and installing the skid control ECU, brake actuator, brake accumulator pump and each sensor, be sure to check that the normal display is output in the Test Mode inspection and in DTC output inspection after installing all the parts.
- DTC PRECAUTION
- Warnings for some DTCs cannot be cleared only by repairing the malfunctioning parts. If the warning is displayed after repair work, the DTC should be cleared after turning the engine switch off.NOTE: If a part is still malfunctioning even after the DTC is cleared, the DTC will be stored again.
- Warnings for some DTCs cannot be cleared only by repairing the malfunctioning parts. If the warning is displayed after repair work, the DTC should be cleared after turning the engine switch off.
- CHASSIS DYNAMOMETER PRECAUTION
- Disable TR(A)C and VSC control when using chassis dynamometer.
When testing with a 2-wheel drum tester such as a speedometer tester, a combination tester for the speedometer and brake, a chassis dynamometer, or when jacking up the rear wheels and turning the wheels, enter the "Maintenance Mode" with the Techstream and change to traction control off mode and VSC system off mode.
CAUTION: If the vehicle is tested in normal mode on the drum tester, the traction control and VSC system may cause the vehicle to jump out from the drum tester.
- Disable TR(A)C and VSC control when using chassis dynamometer.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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