ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1225/25

DTC Code DTC Name
C1225/25 SMC Solenoid Circuit

DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
C1225/25

When any of the following is detected:


  1. When AST terminal voltage is 34 V or less, overcurrent continues for 0.05 seconds or more.

  2. While outputting solenoid OFF, an open circuit continues for 0.05 seconds or more.

  3. When AST terminal voltage is 19 V or more and current does not fluctuate, there is a difference in operation between SMC1 and SMC2 for 0.2 seconds or more.

  4. When AST terminal voltage is 19 V or more, a short in the SMC1 or SMC2 solenoid circuit continues for 0.1 second or more.

  5. When AST terminal voltage is 19 V or more and current that exceeds a specified level is applied, current that is lower than the specified level is monitored for 0.1 second.

  • Brake actuator assembly

  • SMC1 or SMC2 circuit

  • Skid control ECU

WIRING DIAGRAM

Refer to DTCs C0226/21, C0236/22, C0246/23, C0256/24 and C1227/27 Click here.

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT BRAKE ACTUATOR ASSEMBLY


    1. A01CJDQE04

      Disconnect the brake actuator connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      16 (BS) - 10 (AST) Always Below 1 Ω
      10 (AST) - Body ground Always 10 kΩ or higher
      20 (SMC1+) - 13 (SMC1-) Always 31.7 to 35.7 Ω at 25°C (77°F)
      13 (SMC1-) - Body ground Always 10 kΩ or higher
      21 (SMC2+) - 8 (SMC2-) Always 31.7 to 35.7 Ω at 25°C (77°F)
      8 (SMC2-) - Body ground Always 10 kΩ or higher

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE ACTUATOR)


    1. A01CJHCE02

      Disconnect the skid control ECU connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      S11-6 (AST) - S22-10 (AST) Always Below 1 Ω
      S11-6 (AST) - Body ground Always 10 kΩ or higher
      S11-3 (SM1+) - S22-20 (SMC1+) Always Below 1 Ω
      S11-3 (SM1+) - Body ground Always 10 kΩ or higher
      S11-2 (SM1-) - S22-13 (SMC1-) Always Below 1 Ω
      S11-2 (SM1-) - Body ground Always 10 kΩ or higher
      S11-5 (SM2+) - S22-21 (SMC2+) Always Below 1 Ω
      S11-5 (SM2+) - Body ground Always 10 kΩ or higher
      S11-4 (SM2-) - S22-8 (SMC2-) Always Below 1 Ω
      S11-4 (SM2-) - Body ground Always 10 kΩ or higher
      S11-3 (SM1+) - S11-2 (SM1-) Always 10 kΩ or higher
      S11-3 (SM1+) - S11-4 (SM2-) Always 10 kΩ or higher
      S11-5 (SM2+) - S11-2 (SM1-) Always 10 kΩ or higher
      S11-5 (SM2+) - S11-4 (SM2-) Always 10 kΩ or higher
      S11-3 (SM1+) - S11-5 (SM2+) Always 10 kΩ or higher
      S11-2 (SM1-) - S11-4 (SM2-) Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. RECONFIRM DTC


    1. Reconnect the skid control ECU connector and the brake actuator connector.

    2. Clear the DTC (See Pub. No. RM1008E, page 05-195).

    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 (See Pub. No. RM1008E, page 05-195).

      Result
      Result Proceed to
      DTC (C1225/25) is not output A
      DTC (C1225/25) is 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 harness, and fuses of the skid control ECU and brake actuator assembly. Make sure that no DTCs are output.

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

      • It is suspected that the DTCs were output due to a bad connection of the connector terminal.


    B

    REPLACE SKID CONTROL ECU

    A

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here