BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): C14F112,...,C14FA49; Brake Pressure Control Solenoid "C" Control Circuit Short to Battery; 2023 - 2025 MY Corolla Corolla HV [09/2022

Last Modified: 07-31-2024	6.11:8.1.0	Doc ID: RM1000000025DUV
Model Year Start: 2023	Model: Corolla	Prod Date Range: [09/2022 - ]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): C14F112,...,C14FA49; Brake Pressure Control Solenoid "C" Control Circuit Short to Battery; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ]

DTC

C14F112

Brake Pressure Control Solenoid "C" Control Circuit Short to Battery

DTC

C14F114

Brake Pressure Control Solenoid "C" Control Circuit Short to Ground or Open

DTC

C14F11C

Brake Pressure Control Solenoid "C" Control Circuit Voltage Out of Range

DTC

C14F11E

Brake Pressure Control Solenoid "C" Control Circuit Resistance Out of Range

DTC

C14F149

Brake Pressure Control Solenoid "C" Control Internal Electronic Failure

DTC

C14FA12

Brake Pressure Control Solenoid "D" Control Circuit Short to Battery

DTC

C14FA14

Brake Pressure Control Solenoid "D" Control Circuit Short to Ground or Open

DTC

C14FA1C

Brake Pressure Control Solenoid "D" Control Circuit Voltage Out of Range

DTC

C14FA1E

Brake Pressure Control Solenoid "D" Control Circuit Resistance Out of Range

DTC

C14FA49

Brake Pressure Control Solenoid "D" Control Internal Electronic Failure

DESCRIPTION

The ABS solenoid relay and reservoir cut solenoid valves are built into the brake actuator assembly.

When the brakes are operating, the reservoir cut solenoid valves supply brake fluid from the brake master cylinder reservoir assembly to the pump motor as necessary.

When this DTC is stored, the fail-safe function operates and the ABS solenoid relay is turned off to prevent the reservoir cut solenoid valves from operating.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Note
C14F112	Brake Pressure Control Solenoid "C" Control Circuit Short to Battery	A short to +B in the reservoir cut solenoid circuit is detected during the self-test.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C14F4 Output ECU: Skid control ECU (brake actuator assembly)
C14F114	Brake Pressure Control Solenoid "C" Control Circuit Short to Ground or Open	An open or short in the reservoir cut solenoid circuit is detected during the self-test.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C14F3 Output ECU: skid control ECU (brake actuator assembly)
C14F11C	Brake Pressure Control Solenoid "C" Control Circuit Voltage Out of Range	A current leak in the reservoir cut solenoid circuit is detected during the self-test. The reservoir cut solenoid valve operation request signal and reservoir cut solenoid valve operation feedback signal do not match for a certain period of time.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C14F2 (Case 1 to 4) Output ECU: skid control ECU (brake actuator assembly)
C14F11E	Brake Pressure Control Solenoid "C" Control Circuit Resistance Out of Range	An abnormal resistance in the reservoir cut solenoid circuit is detected during the self-test.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C14F2 (Case 5) Output ECU: skid control ECU (brake actuator assembly)
C14F149	Brake Pressure Control Solenoid "C" Control Internal Electronic Failure	An internal malfunction in the reservoir cut solenoid circuit is detected during the self-test.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C14F1 Output ECU: skid control ECU (brake actuator assembly)
C14FA12	Brake Pressure Control Solenoid "D" Control Circuit Short to Battery	A short to +B in the reservoir cut solenoid circuit is detected during the self-test.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C14FD Output ECU: skid control ECU (brake actuator assembly)
C14FA14	Brake Pressure Control Solenoid "D" Control Circuit Short to Ground or Open	An open or short in the reservoir cut solenoid circuit is detected during the self-test.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C14FC Output ECU: skid control ECU (brake actuator assembly)
C14FA1C	Brake Pressure Control Solenoid "D" Control Circuit Voltage Out of Range	A current leak in the reservoir cut solenoid circuit is detected during the self-test. The reservoir cut solenoid valve operation request signal and reservoir cut solenoid valve operation feedback signal do not match for a certain period of time.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C14FB (Case 1 to 4) Output ECU: skid control ECU (brake actuator assembly)
C14FA1E	Brake Pressure Control Solenoid "D" Control Circuit Resistance Out of Range	An abnormal resistance in the reservoir cut solenoid circuit is detected during the self-test.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C14FB (Case 5) Output ECU: skid control ECU (brake actuator assembly)
C14FA49	Brake Pressure Control Solenoid "D" Control Internal Electronic Failure	An internal malfunction in the reservoir cut solenoid circuit is detected during the self-test.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C14FA Output ECU: skid control ECU (brake actuator assembly)

MONITOR DESCRIPTION

C14F1 and C14FA:

When the self-diagnosis function detects a master cylinder cut solenoid internal malfunction when the master cylinder cut solenoid is not operating, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

C14F2 (Case 1) and C14FB (Case 1):

When it is detected by the self-diagnosis function that the feedback value from the master cylinder cut solenoid does not match the operation request value, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

C14F2 (Case 2) and C14FB (Case 2):

When the downstream voltage of the master cylinder cut solenoid or the current flowing in the master cylinder cut solenoid is less than a certain value, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

C14F2 (Case 3) and C14FB (Case 3):

When the master cylinder cut solenoid is not operating and the current flowing in the master cylinder cut solenoid exceeds a certain value (current leak is detected), the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

C14F2 (Case 4) and C14FB (Case 4):

If the current flowing in the master cylinder cut solenoid, circuit temperature, or voltage drop within the circuit is a certain value or more, the skid control ECU (brake actuator assembly) judges that there is a master cylinder cut solenoid overcurrent malfunction and illuminates the MIL and stores this DTC.

C14F2 (Case 5) and C14FB (Case 5):

If the master cylinder cut solenoid is not operating and the resistance value of the master cylinder cut solenoid is outside of a certain range, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

C14F3 and C14FC:

If the current, voltage or temperature of the master cylinder cut solenoid circuit is less than or exceeds a certain value, or the operation request value and feedback value deviate by a certain value or more, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

C14F4 and C14FD:

When it is detected by the self-diagnosis function that there is a short to +B in the master cylinder cut solenoid circuit, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs	C14F1: Cyclic valve test for SRC1 (built in self-test) C14F2 (Case 1): Valve feedback monitoring for SRC1 (PWM check) C14F2 (Case 2): Valve feedback monitoring for SRC1 (valve-coil path interruption) C14F2 (Case 3): Cyclic valve test (current leakage test) for SRC1 C14F2 (Case 4): Valve feedback monitoring for SRC1 (general application specific integrated circuit valve driver failure) C14F2 (Case 5): Cyclic valve test (valve resistance check) for SRC1 C14F3: Cyclic valve test (silent valve driver test) for SRC1 C14F4: Cyclic valve test (valve actuation register test) for SRC1 C14FA: Cyclic valve test for SRC2 (built in self-test) C14FB (Case 1): Valve feedback monitoring for SRC2 (PWM check) C14FB (Case 2): Valve feedback monitoring for SRC2 (valve-coil path interruption) C14FB (Case 3): Cyclic valve test (current leakage test) for SRC2 C14FB (Case 4): Valve feedback monitoring for SRC2 (general application specific integrated circuit valve driver failure) C14FB (Case 5): Cyclic valve test (valve resistance check) for SRC2 C14FC: Cyclic valve test (silent valve driver test) for SRC2 C14FD: Cyclic valve test (valve actuation register test) for SRC2
Required Sensors/Components(Main)	Skid control ECU (brake actuator assembly)
Required Sensors/Components(Related)	Skid control ECU (brake actuator assembly)
Frequency of Operation	During initial checking
Duration	-: C14F1, C14F2 (Case 3 and 5), C14F3, C14F4, C14FA, C14FB (Case 3 and 5), C14FC and C14FD 0.03 seconds: C14F2 (Case 1, 2 and 4), C14FB (Case 1, 2 and 4)
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/EPB* / Utility / All Readiness.
*: Electric Parking Brake System
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 ACTUATOR ASSEMBLY

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END