Toyota Yaris: Vehicle Stability Control System / ABS Solenoid Control Module Actuator Stuck On (C143A7E,C143A7F)

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / ABS Solenoid Control Module Actuator Stuck On (C143A7E,C143A7F)

DESCRIPTION

The ABS solenoid relay is built into the skid control ECU in the brake actuator assembly.

The ABS solenoid relay supplies power to the holding solenoid and reduction solenoid.

The solenoid relay is turned on 1.5 seconds after the ignition switch is turned to ON, and is turned off if an open or short in the solenoid is detected by self-diagnosis performed when the vehicle is starting off.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from
C143A7E	ABS Solenoid Control Module Actuator Stuck On	When voltage at terminal +BS is 9.5 V or higher, solenoid relay is OFF, relay contact is ON continuously for 4.5 seconds or more.	Skid control ECU (brake actuator assembly)	Brake
C143A7F	ABS Solenoid Control Module Actuator Stuck Off	When voltage at terminal +BS is 9.5 V or higher and solenoid relay is ON, relay contact is OFF continuously for 0.22 seconds or more.	Wire harness and connector Skid control ECU (brake actuator assembly)	Brake

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.
After replacing the skid control ECU (brake actuator assembly), perform "Calibration".
Click here

HINT:

When C137BA2 and/or C137BA3 is output together with C143A7E and/or C143A7F, inspect and repair the trouble areas indicated by C137BA2 and/or C137BA3 first.

for C137BA2: Click here

for C137BA3: Click here

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (+BS TERMINAL)

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

OK:

The connector is securely connected.

(b) Disconnect the A108 skid control ECU (brake actuator assembly) connector.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

OK:

No deformation or corrosion.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A108-38 (+BS) - Body ground	Always	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A108-25 (GND1) - Body ground	1 minute or more after disconnecting the cable from the negative (-) auxiliary battery terminal	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

CLEAR DTC

(a) Reconnect the A108 skid control ECU (brake actuator assembly) connector.

(b) Operate the GTS to clear the codes.

Chassis > Brake > Clear DTCs

(d) Turn the ignition switch off.

4.	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
C143A7E and C143A7F are not output	A
C143A7E or C173A7F 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 solenoid circuit.
If the normal system code is output (no DTCs are output), slightly jiggle the connectors, wire harnesses, 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

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