BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): C145D49,C145D71; Electronic Brake Booster Motor "A" Power Supply Circuit "A" Internal Electronic Failure; 2023 - 2025 MY Corolla Corolla HV [09/2022

Last Modified: 05-13-2024	6.11:8.1.0	Doc ID: RM1000000025DUO
Model Year Start: 2023	Model: Corolla	Prod Date Range: [09/2022 - ]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): C145D49,C145D71; Electronic Brake Booster Motor "A" Power Supply Circuit "A" Internal Electronic Failure; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ]

DTC

C145D49

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

DTC

C145D71

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

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.

Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off.
Turn the ignition switch to ON (READY) and turn the GTS on.
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.
Enter the following menus: Chassis / Brake Booster / Utility / All Readiness.
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

END