ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1241

DTC Code DTC Name
C1241 Low Power Supply Voltage Malfunction

DESCRIPTION

If a malfunction is detected in the power supply circuit, the skid control ECU (housed in the actuator assembly) stores this DTC and the fail-safe function prohibits ABS operation.

This DTC is stored when the IG1 terminal voltage deviates from the DTC detection condition due to a malfunction in the power supply or charging circuit such as the battery or generator circuit, etc.

The DTC is cancelled when the IG1 terminal voltage returns to normal.

DTC NO. DTC Detection Condition Trouble Area
C1241

When any of the following is detected:


  1. At a vehicle speed of 3 km/h (2 mph) or more, the IG1 terminal voltage is less than 9.5 V for 10 seconds or more.

  2. When the solenoid relay remains ON and the IG1 terminal voltage is less than 9.5 V, the relay contact is open for 0.22 seconds or more.

  3. With the IG1 terminal voltage 9.5 V or less, the vehicle speed sensor power supply decreases for 60 seconds or more.

  4. When the motor fail safe relay is ON after the motor relay turns ON, the IG1 terminal voltage is 9.5 V or less and the actuator pump drive motor is OFF for 0.22 seconds or more.

  • ECU-IG NO. 2 fuse

  • Battery

  • Charging system

  • Power source circuit

  • Internal power supply circuit of the brake actuator assembly (skid control ECU))

WIRING DIAGRAM

A005GVTE02

CAUTION / NOTICE / HINT

Note


  • When replacing the brake actuator assembly (skid control ECU) or deceleration sensor, be sure to perform deceleration sensor 0 point calibration and CVT oil pressure calibration after performing AT/CVT learned values initialization.

    for K310 Click here

    for K411 Click here

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

  • Perform the test mode procedure after the initialization (perform the test mode start only after the brake actuator assembly (skid control ECU) is replaced).

    Tech Tips

    By performing the test mode start, the identification code of the brake actuator assembly (skid control ECU) is re-registered.

PROCEDURE


  1. INSPECT BATTERY


    1. Check the battery voltage.

      Standard voltage
      11 to 14 V
      Result
      Result Proceed to
      OK A
      NG (for 1ND-TV) B
      NG (for 1NZ-FE) C
      NG (for 1NR-FE) D

    B

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    C

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    D

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    A

  2. CHECK TERMINAL VOLTAGE (IG1)


    1. Disconnect the A55 or A57 brake actuator assembly (skid control ECU) connector.

    2. Turn the ignition switch to ON.

    3. A005JYBE01
      Text in Illustration
      *A except LHD with CVT
      *B for LHD with CVT
      *a

      Front view of wire harness connector

      (to Brake actuator assembly (Skid control ECU) )

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

      Standard Voltage
      except LHD with CVT
      Tester Connection Switch Condition Specified Condition
      A55-34 (IG1) - Body ground Ignition switch ON 11 to 14 V
      for LHD with CVT
      Tester Connection Switch Condition Specified Condition
      A57-34 (IG1) - Body ground Ignition switch ON 11 to 14 V

    4. Reconnect the A55 or A57 brake actuator assembly (skid control ECU) connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

    OK

  3. CHECK HARNESS AND CONNECTOR (GND1)


    1. Turn the ignition switch off.

    2. Disconnect the A55 or A57 brake actuator assembly (skid control ECU) connector.

    3. A005JMHE01
      Text in Illustration
      *A except LHD with CVT
      *B for LHD with CVT
      *a

      Front view of wire harness connector

      (to Brake actuator assembly (Skid control ECU) )

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

      Standard Resistance
      except LHD with CVT
      Tester Connection Condition Specified Condition
      A55-1 (GND1) - Body ground Always Below 1 Ω
      for LHD with CVT
      Tester Connection Condition Specified Condition
      A55-1 (GND1) - Body ground Always Below 1 Ω

    4. Reconnect the A55 or A57 brake actuator assembly (skid control ECU) connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

    OK

  4. RECONFIRM DTC


    1. Clear the DTC Click here.

    2. Start the engine.

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

    4. Check if the same DTC is recorded Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output (for LHD) B
      DTC is output (for RHD) C

      Tech Tips

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step Click here.


    A

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here