Toyota CH-R Service Manual: SM Solenoid Circuit (C1225-C1228,C1468,C1469,C146A,C146B)

Toyota CH-R Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / SM Solenoid Circuit (C1225-C1228,C1468,C1469,C146A,C146B)

DESCRIPTION

These solenoids turn on when signals are received from the skid control ECU (brake actuator assembly) and they control the pressure acting on the wheel cylinders to control the braking force.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1225	SM Solenoid Circuit	Solenoid valve signal does not match the check result.	Solenoid circuit Solenoid valve (brake actuator assembly)
C1226	SA2 Solenoid Circuit	Solenoid valve signal does not match the check result.	Solenoid circuit Solenoid valve (brake actuator assembly)
C1227	SA3 Solenoid Circuit	Solenoid valve signal does not match the check result.	Solenoid circuit Solenoid valve (brake actuator assembly)
C1228	STR Solenoid Circuit	Solenoid valve signal does not match the check result.	Solenoid circuit Solenoid valve (brake actuator assembly)
C1468	SFR Solenoid Circuit	Solenoid valve signal does not match the check result.	Solenoid circuit Solenoid valve (brake actuator assembly)
C1469	SFL Solenoid Circuit	Solenoid valve signal does not match the check result.	Solenoid circuit Solenoid valve (brake actuator assembly)
C146A	SRR Solenoid Circuit	Solenoid valve signal does not match the check result.	Solenoid circuit Solenoid valve (brake actuator assembly)
C146B	SRL Solenoid Circuit	Solenoid valve signal does not match the check result.	Solenoid circuit Solenoid valve (brake actuator assembly)

WIRING DIAGRAM

Refer to DTC C146E.

Click here

PROCEDURE

1.	RECONFIRM DTC

HINT:

These codes are detected when a problem is determined in the skid control ECU (brake actuator assembly).

The solenoid circuits are in the skid control ECU (brake actuator assembly).

Therefore, solenoid circuit inspection and solenoid unit inspection cannot be performed. Be sure to check if any DTCs are output before replacing the skid control ECU (brake actuator assembly).

(a) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC/EPB > Clear DTCs

(b) Turn the ignition switch off.

(d) Drive the vehicle at a speed of 20 km/h (12 mph) or more.

(e) Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRAC/EPB > Trouble Codes

Result	Proceed to
DTCs C1225, C1226, C1227, C1228, C1468, C1469, C146A and C146B are not output.	A
DTCs C1225, C1226, C1227, C1228, C1468, C1469, C146A and/or C146B are output.	B

HINT:

The skid control ECU (brake actuator assembly) performs self diagnosis of the solenoid circuit after the ignition switch is turned to ON.
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

Open in ABS Motor Relay Circuit (C146C)

DESCRIPTION The ABS motor relay supplies power to the pump motor. While the ABS is activated, the skid control ECU turns the ABS motor relay on to operate the pump motor. If the voltage supplied t ...

Yaw Rate Sensor (C1234,C1472,C1474)

DESCRIPTION The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via CAN communication. HINT: If there is a malfuncti ...

Other materials:

Toyota CH-R Service Manual > Pre-collision System: Steering Angle Sensor (C1A47)
DESCRIPTION The millimeter wave radar sensor assembly receives steering angle information from the steering angle sensor (spiral cable with sensor sub-assembly). If the millimeter wave radar sensor assembly detects a steering angle sensor (spiral cable with sensor sub-assembly) malfunction, D ...

Toyota CH-R Service Manual > Airbag System: Center Airbag Sensor Assembly Malfunction (B1000/31)
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Toyota CH-R Service Manual: SM Solenoid Circuit (C1225-C1228,C1468,C1469,C146A,C146B)

Open in ABS Motor Relay Circuit (C146C)

Yaw Rate Sensor (C1234,C1472,C1474)

Other materials:

Toyota C-HR (AX20) 2023-2025 Owner's Manual

Toyota CH-R Owners Manual

Toyota CH-R Service Manual