Brake pedal feeling is abnormal

1. Brake pedal feeling is abnormal description of symptom

Abnormal brake pedal feeling

2. Brake pedal feeling is abnormal diagnostics

1. Preliminary inspection

Perform the brake control system inspection.

Refer to "54.Brake Control 4A.Troubleshooting(ABS/ESC) diagnostic System Check - Brake Controls".

Inspect for the following.

  • There should be no malfunctions in the warning light and indicator light operation.
  • There should be no DTC input.

2. Visual inspection

Visually inspect the vehicle condition with the following in mind before installing, removing, disassembling, and inspecting the components.

  • Terminal connection status inspection
  • Inspection for aftermarket accessory power diverged from the EHCU
  • EHCU ground installation status inspection
  • Installation status inspection of the pipes and hoses in the brake system

3. Diagnostics

1) Brake piping inspection

Inspect for fluid leakage from the brake fluid piping or for air in the brake fluid pressure system.

If the inspection results are normal, go to EHCU replacement.

If the inspection results are abnormal, repair the applicable areas. After completing the procedure, go to Repair verification.

2) EHCU replacement

Note

  • Perform programming after replacing the EHCU.

Refer to "4.Brakes 4Z.Brake Electrical Control EHCU removal".

Refer to "4.Brakes 4Z.Brake Electrical Control EHCU installation".

Refer to "4.Brakes 4Z.Brake Electrical Control EHCU setting".

After completing the procedure, go to Repair verification.

3) Repair verification

Check whether all the components are properly installed.

Perform a test drive and check the symptoms.

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