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

Detection Item

DTC Detection Condition

Trouble Area

C1225

SM Solenoid Circuit

Either of the following is detected:

  1. While master cylinder cut solenoid outputs ON, overcurrent continues for 0.1 seconds or more.

  2. While master cylinder cut solenoid outputs OFF, open circuit continues for 0.05 seconds or more.

  3. While master cylinder cut solenoid outputs ON, open circuit continues for 0.05 seconds or more.

  4. While master cylinder cut solenoid outputs OFF, current is maintained for 0.05 seconds or more.

  5. Difference in master cylinder cut solenoid output accuracy continues for 0.2 seconds or more.

Brake actuator assembly

C1468

SFR Solenoid Circuit

Either of the following is detected:

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

  2. While holding solenoid outputs OFF, open circuit continues for 0.05 seconds or more.

  3. While holding solenoid outputs OFF, current is maintained for 0.05 seconds or more.

  4. While holding solenoid outputs ON, overcurrent continues for 0.1 seconds or more.

  5. While holding solenoid outputs ON, open circuit continues for 0.05 seconds or more.

  6. Difference in holding solenoid LH and RH accuracy continues for 0.2 seconds or more.

Brake actuator assembly

C1469

SFL Solenoid Circuit

Either of the following is detected:

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

  2. While holding solenoid outputs OFF, open circuit continues for 0.05 seconds or more.

  3. While holding solenoid outputs OFF, current is maintained for 0.05 seconds or more.

  4. While holding solenoid outputs ON, overcurrent continues for 0.1 seconds or more.

  5. While holding solenoid outputs ON, open circuit continues for 0.05 seconds or more.

  6. Difference in holding solenoid LH and RH accuracy continues for 0.2 seconds or more.

Brake actuator assembly

C146A

SRR Solenoid Circuit

Either of the following is detected:

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

  2. While holding solenoid outputs OFF, open circuit continues for 0.05 seconds or more.

  3. While holding solenoid outputs OFF, current is maintained for 0.05 seconds or more.

  4. While holding solenoid outputs ON, overcurrent continues for 0.1 seconds or more.

  5. While holding solenoid outputs ON, open circuit continues for 0.05 seconds or more.

  6. Difference in holding solenoid LH and RH accuracy continues for 0.2 seconds or more.

Brake actuator assembly

C146B

SRL Solenoid Circuit

Either of the following is detected:

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

  2. While holding solenoid outputs OFF, open circuit continues for 0.05 seconds or more.

  3. While holding solenoid outputs OFF, current is maintained for 0.05 seconds or more.

  4. While holding solenoid outputs ON, overcurrent continues for 0.1 seconds or more.

  5. While holding solenoid outputs ON, open circuit continues for 0.05 seconds or more.

  6. Difference in holding solenoid LH and RH accuracy continues for 0.2 seconds or more.

Brake actuator assembly

CAUTION / NOTICE / HINT

Note:

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

Click here

PROCEDURE

  1. RECONFIRM DTC

    Tip:

    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).

    1. Clear the DTC.

      Click here

      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the ignition 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 recorded.

      Click here

      Chassis > ABS/VSC/TRC > Trouble Codes

      Result

      Proceed to

      DTC is not output

      DTC is output
      Tip:

      • If a speed signal of 6 km/h (4 mph) or more is input to the skid control ECU (brake actuator assembly), 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 harness, and fuses of the skid control ECU (brake actuator assembly). Make sure that no DTCs are output.

      • If any DTCs are output while jiggling a connector or wire harness from the skid control ECU (brake actuator assembly), inspect and repair the connector or wire harness.

      • The DTCs were probably output due to a bad connection of the connector terminal.

    DTC is not output

    USE SIMULATION METHOD TO CHECK

    Click hereClick here

    DTC is output

    REPLACE BRAKE ACTUATOR ASSEMBLY

    Click hereClick here