BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): C052C11,C052C13,C052F14,C142719; ABS Pump Motor Control Circuit Short to Ground; 2023 - 2025 MY Corolla Corolla HV [09/2022

Last Modified: 07-31-2024	6.11:8.1.0	Doc ID: RM1000000025DTW
Model Year Start: 2023	Model: Corolla	Prod Date Range: [09/2022 - ]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): C052C11,C052C13,C052F14,C142719; ABS Pump Motor Control Circuit Short to Ground; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ]

DTC

C052C11

ABS Pump Motor Control Circuit Short to Ground

DTC

C052C13

ABS Pump Motor Control Circuit Open

DTC

C052F14

ABS Pump Motor Supply Voltage Circuit Short to Ground or Open

DTC

C142719

ABS Pump Motor Circuit Current Above Threshold

DESCRIPTION

The ABS motor relay is built into the brake actuator assembly.

When the skid control ECU (brake actuator assembly) operates ABS, TRAC, VSC, brake hold or brake assist, the ABS motor relay turns ON and drives the motor pump built into the brake actuator assembly.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Note
C052C11	ABS Pump Motor Control Circuit Short to Ground	When the voltage at terminal +BM is between 9.6 and 16.4 V, a short to ground in the ABS motor drive circuit is detected during the self-test.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C052E (Case 1) Output ECU: Skid control ECU (brake actuator assembly)
C052C13	ABS Pump Motor Control Circuit Open	An open in the ABS motor drive circuit is detected during the self-test.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C052C (Case 3 and 6) Output ECU: Skid control ECU (brake actuator assembly)
C052F14	ABS Pump Motor Supply Voltage Circuit Short to Ground or Open	When the pump motor is turned off after operating, 0.6 V or more is detected at the pump motor for 0.48 seconds or more. The power supply of the ABS motor relay is less than 5 V for 0.15 seconds or more.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C055B (Case 1 to 5) Output ECU: Skid control ECU (brake actuator assembly)
C142719	ABS Pump Motor Circuit Current Above Threshold	When the ABS motor relay is operating, an overload in the ABS motor relay is detected for 0.06 seconds or more. When the ABS motor relay is operating, a short in the pump motor drive circuit is detected for 0.06 seconds or more.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C1427 (Case 1 and 2) Output ECU: Skid control ECU (brake actuator assembly)

MONITOR DESCRIPTION

C052E:

The ABS motor relay has a self-diagnosis function that monitors the relay and relay drive circuit. When the self-diagnosis function detects a relay or relay drive circuit malfunction, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

C052C (Case 3 and 6) and C055B (Case 1, 2, 4 and 5):

The skid control ECU (brake actuator assembly) monitors the voltage of the ABS motor relay. If the voltage applied to the relay is a certain value or more or a certain value or less for a certain amount of time, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

C055B (Case 3):

The skid control ECU (brake actuator assembly) has a self-diagnosis function that monitors the pump motor circuit. Under certain conditions, if the pump motor or motor relay self-diagnosis fails a certain number of times for a certain amount of time, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

C1427 (Case 1 and 2):

The skid control ECU (brake actuator assembly) monitors the voltage of the ABS motor relay. If the voltage applied to the relay is excessively large or an internal malfunction is detected in the relay drive circuit, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs	C052C (Case 3): Freewheeling switch source monitoring C052C (Case 6): Motor relay source monitoring C052E: Motor relay gate test C055B (Case 1): Pump motor run monitoring C055B (Case 2): Motor relay drain supply monitoring C055B (Case 3): Pump motor test timeout monitoring C055B (Case 4): Motor relay supply voltage line monitoring (out of range high) C055B (Case 5): Motor relay supply voltage line monitoring (out of range low) C1427 (Case 1): Motor relay drain-source overvoltage monitoring C1427 (Case 2): Pump motor application specific integrated circuit bit failure monitoring
Required Sensors/Components(Main)	Skid control ECU (brake actuator assembly)
Required Sensors/Components(Related)	Skid control ECU (brake actuator assembly) Speed sensor
Frequency of Operation	Continuous: C052E During initial checking: C052C (Case 3 and 6), C055B (Case 1 to 5), C1427 (Case 1 and 2)
Duration	-: C052E and C1427 (Case 2) 0.06 seconds: C052C (Case 3 and 6) and C1427 (Case 1) 0.10 seconds: C055B (Case 4 and 5) 0.15 seconds: C055B (Case 2) 0.48 seconds: C055B (Case 1) 60 seconds: C055B (Case 3)
MIL Operation	Immediately: C052C (Case 3), C052C (Case 6), C055B (Case 1), C055B (Case 2), C055B (Case 3), C055B (Case 4), C055B (Case 5), C1427 (Case 1) and C1427 (Case 2) 2 driving cycles: C052E
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.
Depress the brake pedal several times to operate the pump motor of the brake actuator assembly. [*1]
After the pump motor stops, wait for 2 seconds 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.
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.

CAUTION / NOTICE / HINT

NOTICE:

Before performing troubleshooting, make sure to confirm that the auxiliary battery voltage is normal.
Click here
The system may store DTC C052F14 due to a drop in auxiliary battery voltage. If a DTC regarding low system supply power voltage is output at the same time, perform troubleshooting for that DTC first.

PROCEDURE

1.	REPLACE BRAKE ACTUATOR ASSEMBLY

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END