ANTI-LOCK BRAKE SYSTEM, Diagnostic DTC:C1241

DTC Code DTC Name
C1241 Low Power Supply Voltage Malfunction

DESCRIPTION

When there is an abnormality in the power supply circuit of the skid control ECU (brake actuator assembly), the skid control ECU sets a DTC and the operation is prohibited by the fail-safe function. This DTC is set when the voltage supplied to terminal +BS is outside the DTC detection threshold, due to abnormalities of the battery, power source circuits or charging circuits such as the alternator circuit.

The fail-safe function is canceled when the voltage to terminals IG1 and +BS returns to normal.

DTC No. DTC Detection Condition Trouble Area
C1241

When any of following conditions detected:


  1. +BS terminal voltage 18 V or more, even momentarily.

  2. At vehicle speed 10 km/h (6 mph) or more, +BS terminal voltage 9.7 V or less for 0.021 seconds or more.

  3. At vehicle speed 10 km/h (6 mph) or more, +BS terminal voltage 7.5 V or less, even momentarily.

  • Battery

  • Charging system

  • ABS NO. 2 fuse

  • Power source circuit

  • Skid control ECU (brake actuator assembly)

WIRING DIAGRAM

A01VIXJE02

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. INSPECT BATTERY


    1. Check the battery voltage.

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

    B

    GO TO CHARGING SYSTEM Click here

    C

    GO TO CHARGING SYSTEM Click here

    D

    GO TO CHARGING SYSTEM Click here

    A

  2. CHECK HARNESS AND CONNECTOR (BATTERY - SKID CONTROL ECU - BODY GROUND)


    1. A01VL2IE01
      Text in Illustration
      *A for LHD with CVT, and RHD
      *B for LHD except CVT
      *a

      Front view of wire harness connector

      (to Skid Control ECU)

      Disconnect the skid control ECU connector.

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

      Standard Voltage (for LHD with CVT, and RHD)
      Tester Connection Condition Specified Condition
      A78-1 (+BS) - Body ground Always 11 to 14 V
      Standard Voltage (for LHD except CVT)
      Tester Connection Condition Specified Condition
      A79-1 (+BS) - Body ground Always 11 to 14 V

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

      Standard Resistance (for LHD with CVT, and RHD)
      Tester Connection Condition Specified Condition
      A78-13 (GND1) - Body ground Always Below 1 Ω
      A78-26 (GND2) - Body ground Always Below 1 Ω
      Standard Resistance (for LHD except CVT)
      Tester Connection Condition Specified Condition
      A79-13 (GND1) - Body ground Always Below 1 Ω
      A79-26 (GND2) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. RECONFIRM DTC


    1. Clear the DTC Click here.

    2. Drive the vehicle at 10 km/h (6 mph) or more for several seconds.

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

      Result
      Result Proceed to
      DTC C1241 is not output A
      DTC C1241 is output (for LHD) B
      DTC C1241 is output (for RHD) C

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here