BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model without Electric Parking Brake System TMC Made): C142771; ABS Pump Motor Actuator Stuck; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [09/2022

Last Modified: 05-13-2024	6.11:8.1.0	Doc ID: RM10000000260S8
Model Year Start: 2023	Model: GR Corolla	Prod Date Range: [09/2022 - ]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model without Electric Parking Brake System TMC Made): C142771; ABS Pump Motor Actuator Stuck; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [09/2022 - ]

DTC

C142771

ABS Pump Motor Actuator Stuck

DESCRIPTION

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C142771	ABS Pump Motor Actuator Stuck	Actuator pump motor does not operate properly.	Wire harness and connector Brake actuator assembly (Pump motor) Brake actuator assembly (Pump motor circuit)

WIRING DIAGRAM

Refer to DTC C116514.

Click here

PROCEDURE

1.	PERFORM ACTIVE TEST USING GTS (MOTOR RELAY)

(a) Check the operating sound of the pump motor when operating it using the GTS.

Chassis > Brake/EPB > Active Test

Tester Display

Measurement Item

Control Range

Restrict Condition

Diagnostic Note

Motor Relay

ABS motor relay

OFF / ON

Vehicle condition: Vehicle stopped

HINT:

To protect this Actuator and Solenoid, this test will only last 5 seconds.

Refer to on-vehicle inspection for the brake actuator*

*: Click here

Chassis > Brake/EPB > Active Test

Tester Display
Motor Relay

Result	Proceed to
Operating sound is heard.	A
Operating sound is not heard.	B

GO TO STEP 4

CLEAR DTC

(a) Clear the DTCs.

Chassis > Brake/EPB > Clear DTCs

(b) Turn the ignition switch off.

3.	RECONFIRM DTC

(a) Based on the Freeze Frame Data and interview with the customer, attempt to reproduce the conditions when the malfunction occurred.

(b) Check if the same DTC is output.

Chassis > Brake/EPB > Trouble Codes

Result	Proceed to
DTC C142771 is not output.	A
DTC C142771 is output.	B

HINT:

If a speed signal of 6 km/h (4 mph) or more is input to the skid control ECU (brake actuator assembly) with the ignition switch turned to ON and the stop light switch assembly off, the ECU performs self-diagnosis of the pump motor circuit.
If the normal system code is output (no DTCs are output), slightly jiggle the connectors, wire harness, and fuses of the skid control ECU (brake actuator assembly).
If any DTCs are output while jiggling a connector or wire harness of the skid control ECU (brake actuator assembly), inspect and repair the connector or wire harness.
If no DTCs were output when reconfirming DTCs, checking for intermittent problems is necessary because it is suspected that the original DTCs were stored due to the poor connection of a connector terminal.

USE SIMULATION METHOD TO CHECK

REPLACE BRAKE ACTUATOR ASSEMBLY

4.	CHECK HARNESS AND CONNECTOR (GND2 TERMINAL)

(a) Turn the ignition switch off.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

(e) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A140-30 (GND2) - Body ground	1 minute or more after disconnecting the cable from the negative (-) battery terminal	Below 1 Ω

REPLACE BRAKE ACTUATOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR