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Home >> Hyundai >> 2018 >> Ioniq Plug-In Hybrid >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Active Hydraulic Boost (AHB) System (PHEV) >> Schematic Diagrams >> Repair Procedures >> AHB Brake System Bleeding Procedure >> AHB Brake System >> Bleeding Step 2 (IBAU ECU ON)

Bleeding Step 2 (IBAU ECU ON)

  1. Connect the negative (-) battery terminal to turn on IBAU ECU.
  2. Start the engine.
  3. Set the front wheels straight forward and the shift lever knob in Parking.
  4. If the ESC function is completely turned off after about 3 seconds with the ESC Off switch held down, hold the ESC OFF switch and operate the brake pedal 10 times in full stroke. And then turn off the engine.
    NOTE:
    • When stepping on the brake pedal, press 40mm or more, and when releasing it, press down 10mm or less.
    • The ESC OFF switch must be held down until the pedal operation is finished and the engine is turned off.
  5. Start the engine. And then press the ESC OFF switch for more than 3 seconds to enter ESC OFF mode.
    NOTE:
    • Running from 1 to 5, you can enter the air bleeding mode.
    • If you do not air bleeding in air bleeding mode, it will not work properly.
    • The ABS, ESC OFF, EBD warning lamp is turned ON can be confirmed the entry into the air bleeding mode.
    • The air bleeding mode process should be completed within 30 seconds.

    Information 

    The air bleeding mode is released in each following condition.

    • Ignition OFF and shift lever knob in D/R/N
    • Detecting DTC
    • Brake fluid level is under "MIN"
    • ESC off mode released
  6. Use the air bleeding tool (SST: 09580-3D100, 0K585-E8100) and feed oil pressure 0.3 - 0.35 MPa (43.5 - 50.7 psi) into the reservoir.

    Loosen the bleed screws on 4 wheels; then, initiate air bleeding and close them while depressing the brake pedal half stroke continuously. Perform it 10 times; then, release the brake pedal.

    Bleed screw sequence: 3 4 wheels

    G12729473Courtesy of HYUNDAI MOTOR AMERICA
    NOTE:
    • Repeat it until air bubbles no longer appear in the fluid.
    • Be cautious that air come in the brake line with opening the bleed screws too much.
  7. Connect the GDS to the data link connector located underneath the dash panel and perform "Fluid Circulation Mode" on GDS.