Lexus IS250 · Service Manual BRAKE

C0226/21

Diagnostic trouble codes

DESCRIPTION

These solenoids turn on when signals are received from the skid control ECU and control the pressure acting on the wheel cylinders to control the braking force.
DTC No.
 DTC Detection Condition
 Trouble Area
C0226/21
C0236/22
C0246/23
C0256/24
 Open or short in the solenoid circuit continues for 0.05 seconds or more.
  1. Brake actuator assembly
  2. Solenoid circuit
C1225/25
 When any of the following is detected:
  1. While outputting switching solenoid (SM1 or SM2) ON,
    overcurrent continues for 0.05 seconds or more.
  2. While outputting switching solenoid (SM1 or SM2) OFF, an
    open circuit continues for 0.05 seconds or more.
  3. While outputting switching solenoid (SM1 or SM2) ON,
    an open circuit continues for 0.1 seconds or more.
  4. While outputting switching solenoid (SM1 or SM2) 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 is shorted for 0.1 seconds or more.
  1. Brake actuator assembly
  2. SM1 or SM2 circuit

WIRING DIAGRAM

C109386E02

INSPECTION PROCEDURE

NOTICE:
When replacing the brake actuator assembly, perform zero point calibration (Click here ).


1. RECONFIRM DTC

HINT:
These codes are detected when a problem is determined in the brake actuator assembly.
The solenoid circuits are in the brake actuator assembly.
Therefore, solenoid circuit inspection and solenoid unit inspection cannot be performed. Be sure to check if any DTC code is output before replacing the brake actuator assembly.

  1. Clear the DTC (Click here).

  1. Start the engine.

  1. Drive the vehicle at the speed of 4 mph (6 km/h) or more.

  1. Check if the same DTC is recorded (Click here).

    Result:
    Condition
    		 Proceed to
    DTCs (C0226/21, C0236/22, C0246/23, C0256/24 and/or C1225/25) are not output
    		 A
    DTCs (C0226/21, C0236/22, C0246/23, C0256/24 and/or C1225/25) are output
    		 B

    HINT:
    1. If a speed signal of 4 mph (6 km/h) or more is input to the skid control ECU, with the engine switch on (IG) and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits.
    2. If the normal system code is output (the trouble code is not output), slightly jiggle the connectors, wire harness, and fuses of the brake actuator assembly. Make sure that no DTCs are output.
    3. If any DTCs are output while jiggling a connector or wire harness of the brake actuator (skid control ECU), inspect and repair the connector or wire harness.



 B
REPLACE BRAKE ACTUATOR ASSEMBLY
A

USE SIMULATION METHOD TO CHECK


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