Toyota Corolla Cross: ABS Pump Motor Control Internal Electronic Failure (C052C49)

Toyota Corolla Cross (2022-2024) Service Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System (for Hev Model) / ABS Pump Motor Control Internal Electronic Failure (C052C49)

DESCRIPTION

The ABS motor relay and pump motor are built into the brake actuator assembly.

If the skid control ECU (brake actuator assembly) detects a malfunction in the drive circuit of the pump motor, this DTC is stored.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Note
C052C49	ABS Pump Motor Control Internal Electronic Failure	The skid control ECU (brake actuator assembly) detects a malfunction in the pump motor circuit. When the system has started, a short to +B is detected during the ABS motor drive circuit self-test.	Skid control ECU (brake actuator assembly)	Comes on	Brake/EPB	SAE Code: C052C (Case 1, 2, 4, 5, 7, 8, 9 and 10) Output ECU: Skid control ECU (brake actuator assembly)

MONITOR DESCRIPTION

C052C (Case 1, 2, 4, 5 and 8):

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

C052C (Case 7):

The ABS motor relay has a self-diagnosis function that monitors the relay and relay drive circuit. When the vehicle is being driven at a certain speed and the self-diagnosis function detects a momentary interruption (open), short, or internal malfunction in the relay drive circuit, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

C052C (Case 9):

The ABS motor relay has a self-diagnosis function that monitors the relay and relay drive circuit. When the vehicle is being driven at a certain speed and the self-diagnosis function detects the ABS motor relay is not operating correctly, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

C052C (Case 10):

When the pump motor is not operating and the voltage applied to the pump motor is more than a certain value, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs	C052C (Case 1): Actuation modulator test C052C (Case 2): Active freewheeling path test C052C (Case 4): Inverse motor actuation test and inverse motor relay gate test C052C (Case 5): Load dump test C052C (Case 7): Motor relay source negative voltage test and Motor relay source negative voltage monitoring C052C (Case 8): Analog to digital converter connect test (active & passive) C052C (Case 9): Pump motor test C052C (Case 10): Pump motor feedback voltage 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	During initial checking
Duration	-: C052C (Case 1, 2, 4, 5, 7-1, 8 and 9) 0.06 seconds: C052C (Case 7-2) 2 seconds: C052C (Case 10)
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.
Depress the brake pedal several times to operate the pump motor of the brake actuator assembly. [*1]
Drive the vehicle at 40 km/h (25 mph) or more for 1 second. [*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.

PROCEDURE

1.	REPLACE BRAKE ACTUATOR ASSEMBLY

Click here

END

SEE MORE:

On-vehicle Inspection

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Installation

INSTALLATION CAUTION / NOTICE / HINT COMPONENTS (INSTALLATION) Procedure Part Name Code 1 WINDSHIELD WASHER MOTOR AND PUMP ASSEMBLY 85310 - - - 2 WINDSHIELD WASHER MOTOR AND PUMP ASSEMBLY 85310 - - - 3 ADD WASHER FLUID

Toyota Corolla Cross: ABS Pump Motor Control Internal Electronic Failure (C052C49)

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