VEHICLE STABILITY CONTROL 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 brake 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 cleared when the IG1 terminal voltage returns to normal.

DTC Code DTC Detection Condition Trouble Area
C1241

One of the following conditions is met:


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

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

  3. With the IG1 terminal voltage at 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 driver motor is off for 0.22 seconds or more.

  • LH ECU-IG fuse (for LHD)

  • RH ECU-IG fuse (for RHD)

  • Battery

  • Charging system

  • Power source circuit

  • Internal power supply circuit of the skid control ECU

WIRING DIAGRAM

A01FE4IE24

INSPECTION PROCEDURE

Note


  • When replacing the brake actuator assembly, perform zero point calibration and store system information Click here.

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

PROCEDURE


  1. INSPECT BATTERY


    1. Inspect the battery voltage.

      Standard voltage
      11 to 14 V
      Result
      Result Proceed to
      OK A
      NG (for 2GR-FSE) B
      NG (for 4GR-FSE) C

    B

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    C

    CHECK OR REPLACE CHARGING SYSTEM OR BATTERY Click here

    A

  2. CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)


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

    2. A01FGCKE98
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU [Brake Actuator Assembly])

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A13-34 (IG1) - Body ground Engine switch on (IG) 11 to 14 V
      Result
      Result Proceed to
      OK A
      NG (for 2GR-FSE) B
      NG (for 4GR-FSE) C

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (GND1 TERMINAL)


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

    2. A01FH1RE08
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU [Brake Actuator Assembly])

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A13-1 (GND1) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Turn the engine switch off.

    3. Start the engine.

    4. Perform a road test.

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

      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here