BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model without Electric Parking Brake System TMMMS Made): C052C11,...,C142719; ABS Pump Motor Control Circuit Short to Ground; 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022

Last Modified: 05-13-2024	6.11:8.1.0	Doc ID: RM10000000265SY
Model Year Start: 2023	Model: GR Corolla	Prod Date Range: [09/2022 - 11/2022]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model without Electric Parking Brake System TMMMS Made): C052C11,...,C142719; ABS Pump Motor Control Circuit Short to Ground; 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022]

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 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
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)
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)
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)
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)

DTC Detection Conditions: C052F14

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	The pump motor is turned off after operating.	○	-
Malfunction Status	0.6 V or more is detected at the pump motor.	○	-
Malfunction Status	The power supply of the ABS motor relay is less than 5 V.	-	○
Detection Time		0.48 seconds or more.	0.15 seconds or more.
Number of Trips		1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

DTC Detection Conditions: C142719

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	The ABS motor relay is operating.	○	○
Malfunction Status	An overload in the ABS motor relay is detected.	○	-
Malfunction Status	A short in the pump motor drive circuit is detected.	-	○
Detection Time		0.06 seconds or more.	0.06 seconds or more.
Number of Trips		1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

CAUTION / NOTICE / HINT

NOTICE:

After replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and store system information memorization.
Click here
Before performing troubleshooting, make sure to confirm that the battery voltage is normal.
Click here
The system may store DTC C052F14 due to a drop in 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

(a) Replace the skid control ECU (brake actuator assembly).

Click here

END