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.
Component Inspection
- IG "OFF"
- IG "ON"
- After connecting GDS, check DTC on the GDS.
- Using GDS, Erase the DTCs.
- Check if the pressure sensor's service data shows '0 bar' on the GDS while not pressing the brake pedal.
- Check if the pressure sensor's service data rises on the GDS while pressing the brake pedal.
- Is the pressure sensor's data unusually shown?
YES
Substitute with a known-good HECU and check for proper operation.
If problem is corrected, replace HECU and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
In a case of replacing HECU, operate each sensor's calibration by scantool, including the steering angle sensor's calibration.
If the fault is not solved, This problem may be caused by a brake oil's leakage.
Check if there is a leakage on each brake oil's hoses.
NO
This fault is intermittently caused by the sensor.
Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.