Toyota Yaris: Vehicle Stability Control System / ABS Pump Motor Actuator Stuck (C142771)

Toyota Yaris XP210 (2020-2026) Reapir and Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / ABS Pump Motor Actuator Stuck (C142771)

DESCRIPTION

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from
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)	Brake

WIRING DIAGRAM

Refer to DTC C052C13.

Click here

CAUTION / NOTICE / HINT

NOTICE:

After replacing the skid control ECU (brake actuator assembly), perform "Calibration".

Click here

PROCEDURE

1.	PERFORM ACTIVE TEST USING GTS (MOTOR RELAY)

(a) Perform the Active Test of the motor relay using the GTS.

Chassis > Brake > 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.	-

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.

Chassis > Brake > Active Test

Tester Display
Motor Relay

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

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

GO TO STEP 4

CLEAR DTC

(a) Operate the GTS to clear the codes.

Chassis > Brake > Clear DTCs

(b) Press the DTC clear button.

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) Operate the GTS to read the DTCs.

Chassis > Brake > Trouble Codes

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

HINT:

If a speed signal of 20 km/h (12 mph) or more is input to the skid control ECU (brake actuator assembly) with the ignition switch 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
A108-1 (GND2) - Body ground	1 minute or more after disconnecting the cable from the negative (-) auxiliary battery terminal	Below 1 Ω

REPLACE BRAKE ACTUATOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

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