Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Electronic Brake Booster Motor "A" Power Supply Circuit "A" Internal Electronic Failure (C145D49,C145D71)

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" Power Supply Circuit "A" Internal Electronic Failure (C145D49,C145D71)

DESCRIPTION

The main relay is built into the electric brake booster (brake booster with master cylinder assembly).

When the electric brake booster (brake booster with master cylinder assembly) detects a malfunction in a circuit necessary for main relay to operate, or in the main relay itself, this DTC is stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

DTC Output from

Note

C145D49

Electronic Brake Booster Motor "A" Power Supply Circuit "A" Internal Electronic Failure

Main relay inside electric brake booster (brake booster with master cylinder assembly) stuck ON detected.

Electric brake booster (brake booster with master cylinder assembly)

Comes on

Brake Booster

  • SAE Code: C145D (Case 2)
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

C145D71

Electronic Brake Booster Motor "A" Power Supply Circuit "A" Actuator Stuck

Main relay inside electric brake booster (brake booster with master cylinder assembly) power source circuit condition detected.

Electric brake booster (brake booster with master cylinder assembly)

Comes on

Brake Booster

  • SAE Code: C145D (Case 1)
  • Output ECU: Electric brake booster (brake booster with master cylinder assembly)

MONITOR DESCRIPTION

C145D (Case 1):
  • When the power supply voltage of the electric brake booster (brake booster with master cylinder assembly) is a certain value or more, the electronically controlled brake system is starting, and a main relay malfunction inside the electric brake booster (brake booster with master cylinder assembly) is detected, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
C145D (Case 2):
  • When a main relay malfunction inside the electric brake booster (brake booster with master cylinder assembly) is detected during the self-diagnosis that is performed during startup of the electronically controlled brake system, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs

C145D (Case 1): Booster master switch initial test

C145D (Case 2): Booster master switch failsafe logic test

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

0.015 seconds: C145D (Case 1)

1 second after ignition switch ON: C145D (Case 2)

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

NEXT

END

    READ NEXT:

     Electronic Brake Booster Motor "A" Temperature Sensor "A" Circuit Voltage Out of Range (C148A1C,...,C149A1C)

    DESCRIPTION Refer to DTC C11704B Click here DTC No. Detection Item DTC Detection Condition Trouble Area MIL DTC Output from

     Multi-axis Acceleration Sensor Module "A" Supply Voltage Circuit Voltage Out of Range (C14D71C)

    DESCRIPTION The airbag ECU assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition. This DTC is stored when the skid control ECU (brake actuator assembly) rece

     Left Front Wheel Speed Sensor Supply Voltage Circuit Short to Ground or Open (C14E014)

    DESCRIPTION Refer to DTC C050012 Click here DTC No. Detection Item DTC Detection Condition Trouble Area MIL DTC Output from

    SEE MORE:

     Multi-axis Acceleration Sensor Module "A" Signal Stuck In Range (C05202A)

    DESCRIPTION The airbag ECU assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition. The skid control ECU (brake actuator assembly) memorizes the range of the acceleration sensor (airbag ECU assembly) and the range of vehicle speed calculated using each spee

     Installation

    INSTALLATION CAUTION / NOTICE / HINT COMPONENTS (INSTALLATION) Procedure Part Name Code 1 FRONT DOOR BELT MOULDING ASSEMBLY 75720 - - - 2 FRONT DOOR FIX WINDOW GLASS 68126 - - - 3 FRONT LOWER FRONT DOOR FRAME SUB-ASSEMBLY

    © 2020-2024 Copyright www.tcorollacross.com