Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Electronic Brake Booster Motor "A" Drive Circuit Internal Electronic Failure (C12BF49,...,C12BF9E)

Toyota Corolla Cross (2022-2024) Service Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System (for Hev Model) / Electronic Brake Booster Motor "A" Drive Circuit Internal Electronic Failure (C12BF49,...,C12BF9E)

DESCRIPTION

The motor relay is built into the brake booster with master cylinder assembly.

The electric brake booster (brake booster with master cylinder assembly) turns the motor relay on to operate the motor in the brake booster with master cylinder assembly in accordance with the operation angle of the brake pedal by the driver.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

Note

C12BF49

Electronic Brake Booster Motor "A" Drive Circuit Internal Electronic Failure

Motor relay drive circuit abnormality detected.

Electric brake booster (brake booster with master cylinder assembly)

Comes on

Brake Booster

  • SAE Code: C12BF (Case 6)
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C12BF87

Electronic Brake Booster Motor "A" Drive Circuit Missing Message

Motor relay drive circuit abnormality detected.

Electric brake booster (brake booster with master cylinder assembly)

Comes on

Brake Booster

  • SAE Code: C12BF (Case 9)
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C12BF96

Electronic Brake Booster Motor "A" Drive Circuit Component Internal Failure

Motor relay internal abnormality detected.

Electric brake booster (brake booster with master cylinder assembly)

Comes on

Brake Booster

  • SAE Code: C12BF (Case 1 to 5 and 8)
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C12BF9E

Electronic Brake Booster Motor "A" Drive Circuit Stuck On

Motor relay drive circuit low voltage detected.

Electric brake booster (brake booster with master cylinder assembly)

Comes on

Brake Booster

  • SAE Code: C12BF (Case 7)
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

MONITOR DESCRIPTION

C12BF (Case 1, 2 and 6):
  • When the electronically controlled brake system is starting and a motor drive circuit malfunction is detected, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
C12BF (Case 3, 4 and 5):
  • When the electronically controlled brake system is operating or shutting down and a motor drive circuit internal malfunction is detected, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
C12BF (Case 7):
  • When the electronically controlled brake system is starting, operating or shutting down, and the MOSFET voltage of the motor drive circuit is outside of a certain range, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
C12BF (Case 8):
  • When the electronically controlled brake system is starting or DTC conditions are met, the self-diagnosis function performs a motor test. If the motor test does not complete within a certain amount of time, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
C12BF (Case 9):
  • When the electronically controlled brake system is starting, operating or shutting down, and a motor drive circuit malfunction is detected, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs

C12BF (Case 1): Motor drive circuit start up test

C12BF (Case 2): Motor drive circuit unsupported configuration monitor

C12BF (Case 3): Motor drive circuit internal failure monitor

C12BF (Case 4): Motor drive circuit FET monitor

C12BF (Case 5): Motor drive circuit unavailable

C12BF (Case 6): Motor drive circuit FET failure detection circuit test

C12BF (Case 7): Motor drive circuit phase short circuit test and monitor

C12BF (Case 8): Motor drive circuit initial test timeout monitor

C12BF (Case 9): Motor drive circuit serial peripheral interface communication monitor

Required Sensors/Components(Main)

Electric brake booster (brake booster with master cylinder assembly)

Required Sensors/Components(Related)

Electric brake booster (brake booster with master cylinder assembly)

Frequency of Operation

During initial checking

Duration

-: C12BF (Case 1, 3, 4, 6)

0.01 seconds: C12BF (Case 2 and 9)

0.03 seconds: C12BF (Case 7)

0.1 seconds: C12BF (Case 5)

0.505 seconds: C12BF (Case 8)

MIL Operation

Immediately

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

TMC's intellectual property

Other conditions belong to TMC's intellectual property

-

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property

-

COMPONENT OPERATING RANGE

TMC's intellectual property

-

CONFIRMATION DRIVING PATTERN

NOTICE:

When performing the normal judgment procedure, make sure that the driver door is closed and is not opened at any time during the procedure.

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON and turn the GTS on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the ignition switch off.
  5. Turn the ignition switch to ON (READY) and turn the GTS on.
  6. Depress the brake pedal several times to operate the motor of the brake booster with master cylinder assembly.[*1]
  7. Wait for 1 second or more. [*2]

    HINT:

    [*1] to [*2]: Normal judgment procedure.

    The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

  8. Enter the following menus: Chassis / Brake Booster / Utility / All Readiness.
  9. Check the DTC judgment result.

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE, perform driving pattern again.

PROCEDURE

1.

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

Click here

NEXT

END

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