Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000025DUC
Model Year Start: 2023 Model: Corolla Prod Date Range: [09/2022 -           ]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): C12B400,C12B41C,C12B41E,C12B477,C12B496,C12B579; Electronic Brake Booster Motor "A"; 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]

DTC

C12B400

Electronic Brake Booster Motor "A"

DTC

C12B41C

Electronic Brake Booster Motor "A" Circuit Voltage Out of Range

DTC

C12B41E

Electronic Brake Booster Motor "A" Circuit Resistance Out of Range

DTC

C12B477

Electronic Brake Booster Motor "A" Commanded Position Not Reachable

DTC

C12B496

Electronic Brake Booster Motor "A" Component Internal Failure

DTC

C12B579

Electronic Brake Booster Motor "A" Mechanical Linkage Failure

DESCRIPTION

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

The electric brake booster (brake booster with master cylinder assembly) drives the motor in accordance with the operation angle of the brake pedal by the driver to assist the brake pedal force of the driver.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

Note

C12B400

Electronic Brake Booster Motor "A"

Abnormality in motor actuator rotation is detected for 0.3 seconds or more.

Electric brake booster (brake booster with master cylinder assembly)

Comes on

Brake Booster
  • SAE Code: C12B4 (Case 3)
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C12B41C

Electronic Brake Booster Motor "A" Circuit Voltage Out of Range

Poor internal condition of motor actuator is detected.

Electric brake booster (brake booster with master cylinder assembly)

Comes on

Brake Booster
  • SAE Code: C12B4 (Case 4)
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C12B41E

Electronic Brake Booster Motor "A" Circuit Resistance Out of Range

Internal failure in motor actuator is detected for 0.12 seconds.

Electric brake booster (brake booster with master cylinder assembly)

Does not come on

Brake Booster

Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C12B477

Electronic Brake Booster Motor "A" Commanded Position Not Reachable

Abnormality in motor actuator rotation is detected for 0.3 seconds or more.

Electric brake booster (brake booster with master cylinder assembly)

Comes on

Brake Booster
  • SAE Code: C12B4 (Case 2)
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C12B496

Electronic Brake Booster Motor "A" Component Internal Failure

Detected that the motor actuator cannot be driven.

Electric brake booster (brake booster with master cylinder assembly)

Comes on

Brake Booster
  • SAE Code: C12B4 (Case 1)
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C12B579

Electronic Brake Booster Motor "A" Mechanical Linkage Failure

Abnormality in motor actuator rotation is detected.

Electric brake booster (brake booster with master cylinder assembly)

Comes on

Brake Booster
  • SAE Code: C12B5 (Case 1 and 2)
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

MONITOR DESCRIPTION

C12B4 (Case 1):

  • If the difference between the target angle of the pump motor and actual angle of the pump motor is more than a certain value, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.

C12B4 (Case 2):

  • If there is an abnormal difference between the target rotation speed of the pump motor and actual rotation speed of the pump motor, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.

C12B4 (Case 3):

  • If there is an abnormal difference between the brake pedal stroke amount detected by the differential travel sensor and the target stroke amount, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.

C12B4 (Case 4):

  • If the difference between the target drive voltage and actual drive voltage of the pump motor is more than a certain value, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.

C12B5 (Case 1):

  • If the spindle position inside the brake booster with master cylinder assembly is outside of a certain range, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.

C12B5 (Case 2):

  • After self-diagnosis is performed, if the spindle position inside the brake booster with master cylinder assembly is not suitable or the spindle position cannot be detected after a certain amount of time has elapsed, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs

C12B4 (Case 1): Motor test

C12B4 (Case 2): Motor rotation angle sensor rationality monitor (rotation speed)

C12B4 (Case 3): Relative displacement rationality monitor

C12B4 (Case 4): Motor voltage rationality monitor

C12B5 (Case 1): Spindle position range monitor

C12B5 (Case 2): Reference run 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)

Speed sensor

Frequency of Operation

During initial checking

Duration

-: C12B5 (Case 2)

0.01 seconds: C12B4 (Case 1)

0.02 seconds: C12B4 (Case 4)

0.3 seconds: C12B4 (Case 2 and 3)

More than 0.56 seconds (in case of MAX motor speed): C12B5 (Case 1)

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. Wait for 1 second or more. [*]

    HINT:

    [*]: Normal judgment procedure.

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

  7. Enter the following menus: Chassis / Brake Booster / Utility / All Readiness.
  8. 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 2023 - 2025 MY Corolla Corolla HV [09/2022 -        ]; BRAKE SYSTEM (OTHER): BRAKE BOOSTER (for HV Model): REMOVAL

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