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.
Symptom Diagnosis: Notes
The symptoms that cannot be indicated by warning light can be divided in the following five categories:
- ABS works frequently but vehicle does not decelerate.
- Uneven braking occurs while ABS works.
- The wheels lock during braking.
- Brake pedal feel is abnormal.
- Braking sound (from EHCU) is heard while not braking.
These are all attributed to problems which cannot be detected by EHCU self-diagnosis. Use the customer complaint and test to determine which symptom is present. Then follow the appropriate flow chart listed below.
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.