VEHICLE STABILITY CONTROL SYSTEM (for Vacuum Brake Booster), Diagnostic DTC:C0226, C0236, C0246, C0256, C1225

DTC Code	DTC Name
C0226	SFR Solenoid Circuit
C0236	SFL Solenoid Circuit
C0246	SRR Solenoid Circuit
C0256	SRL Solenoid Circuit
C1225	SM Solenoid Circuit

DESCRIPTION

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

DTC Code	DTC Detection Condition	Trouble Area
C0226 C0236 C0246 C0256	An open or short in the solenoid circuit continues for 0.05 seconds or more.	Solenoid circuit Brake actuator assembly
C1225	One of the following conditions is met: While switching solenoid (SM1 or SM2) is outputting ON, overcurrent continues for 0.1 seconds or more. While switching solenoid (SM1 or SM2) is outputting OFF, an open circuit continues for 0.05 seconds or more. While switching solenoid (SM1 or SM2) is outputting ON, an open circuit continues for 0.05 seconds or more. While switching solenoid (SM1 or SM2) is outputting OFF, current continues to be applied for 0.05 seconds or more. A condition in which the outputs from switching solenoids 1 and 2 are different continues for 0.2 seconds or more.	SM1 or SM2 circuit Brake actuator assembly

DTC Code

DTC Detection Condition

Trouble Area

C0226

C0236

C0246

C0256

An open or short in the solenoid circuit continues for 0.05 seconds or more.

Solenoid circuit
Brake actuator assembly

C1225

One of the following conditions is met:

While switching solenoid (SM1 or SM2) is outputting ON, overcurrent continues for 0.1 seconds or more.
While switching solenoid (SM1 or SM2) is outputting OFF, an open circuit continues for 0.05 seconds or more.
While switching solenoid (SM1 or SM2) is outputting ON, an open circuit continues for 0.05 seconds or more.
While switching solenoid (SM1 or SM2) is outputting OFF, current continues to be applied for 0.05 seconds or more.
A condition in which the outputs from switching solenoids 1 and 2 are different continues for 0.2 seconds or more.

SM1 or SM2 circuit
Brake actuator assembly

WIRING DIAGRAM

INSPECTION PROCEDURE

Note

When replacing the brake actuator assembly, perform calibration Click here.

PROCEDURE

RECONFIRM DTC

Tech Tips

These codes are stored when a problem is detected in the brake actuator assembly.

The solenoid circuits are in the brake actuator assembly.

Therefore, solenoid circuit inspections and solenoid unit inspections cannot be performed. Be sure to check if any DTCs are output before replacing the brake actuator assembly.

Clear the DTCs Click here.
Start the engine.
Drive the vehicle at a speed of 20 km/h (12 mph) or more.

Check if the same DTC is output Click here.

Result
Result	Proceed to
DTC not output	A
DTC output	B

Tech Tips

If a speed signal of 6 km/h (4 mph) or more is input to the skid control ECU with the ignition switch ON and the stop light switch off, the ECU performs self-diagnosis of the motor and solenoid circuits.
If the normal system code is output (the trouble code is not output), slightly jiggle the connectors, wire harnesses, and fuses of the brake actuator assembly. Make sure that no DTCs are output.
If any DTCs are output while jiggling a connector or wire harness of the brake actuator assembly (skid control ECU), inspect and repair the connector or wire harness. The DTCs were probably output due to a bad connection of the connector terminal.

REPLACE BRAKE ACTUATOR ASSEMBLY Click here

USE SIMULATION METHOD TO CHECK Click here