VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1225, C1468, C1469, C146A, C146B

DTC Code DTC Name
C1225 SM Solenoid Circuit
C1468 SFR Solenoid Circuit
C1469 SFL Solenoid Circuit
C146A SRR Solenoid Circuit
C146B SRL Solenoid Circuit

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. DTC Detection Condition Trouble Area

C1468

C1469

C146A

C146B

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

  • Solenoid circuit

  • Solenoid valve (Brake actuator assembly)
C1225

Any of the following is detected:


  1. While switching solenoid (SM1 or SM2) is on, overcurrent continues for 0.15 seconds or more.

  2. While switching solenoid (SM1 or SM2) is off, an open circuit continues for 0.05 seconds or more.

  3. While switching solenoid (SM1 or SM2) is on, an open circuit continues for 0.05 seconds or more.

  4. While switching solenoid (SM1 or SM2) is off, current continues to be applied for 0.1 seconds or more.

  5. Short to GND in the switching solenoid (SM1 or SM2) continues for 0.1 seconds or more.

  6. Switching solenoids SM1 and SM2 are shorted for 0.1 seconds or more.

  • Solenoid circuit

  • Solenoid valve (Brake actuator assembly)

WIRING DIAGRAM

Refer to DTCs C146E and C146F Click here.

INSPECTION PROCEDURE

Note

When replacing the skid control ECU (brake actuator assembly), perform zero point calibration Click here.

PROCEDURE


  1. RECONFIRM DTC

    Tech Tips


    • 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 DTC is output before replacing the skid control ECU (brake actuator assembly).


    1. Clear the DTCs Click here.

    2. Turn the engine switch off.

    3. Start the engine.

    4. Drive the vehicle at a speed of 20 km/h (12 mph) or more for 30 seconds or more.

    5. Check if the same DTC is output Click here.

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

      Tech Tips


      • The skid control ECU (brake actuator assembly) performs self diagnosis of the solenoid circuit after the engine switch is turned on (IG).

      • 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.


    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    USE SIMULATION METHOD TO CHECK Click here