VEHICLE STABILITY CONTROL SYSTEM(for Hydraulic Brake Booster), Diagnostic DTC:C1241

DTC Code DTC Name
C1241 Low Power Supply Voltage Malfunction

DESCRIPTION

If the voltage supplied to the IG1 terminal is within the DTC detection range due to malfunctions in components such as the battery and generator circuit, this DTC is stored.

DTC Code DTC Detection Condition Trouble Area
C1241

Either condition is met:

1. Both of the following conditions continue for at least 10 seconds.


  • The vehicle speed is more than 3 km/h (2 mph).

  • The IG1 terminal voltage is below 9.5 V.

2. All of the following conditions continue for at least 0.2 seconds.


  • The solenoid relay remains on.

  • The IG1 terminal voltage is below 9.5 V.

  • The relay contact is open.

  • Battery

  • ECU-IG NO. 1 fuse

  • Charging system

  • Harness or connector

  • Master cylinder solenoid (Skid control ECU)

WIRING DIAGRAM

B001E96E25
*a from IG1 Circuit
*b ECU-IG NO. 1
*c Master Cylinder Solenoid (Skid Control ECU)

CAUTION / NOTICE / HINT

Note


  • When replacing the master cylinder solenoid, perform calibration Click here.

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

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (IG1 VOLTAGE VALUE)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Start the engine.

    5. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      IG1 Voltage Value IG1 voltage value/ Min.: 0.00 V, Max.: 20.00 V Ignition switch ON: 11 to 14 V -

    6. Check the voltage output from the skid control ECU displayed on the intelligent tester.

      OK
      The output voltage displayed on the intelligent tester is within 11 to 14 V.

    NG

    CHECK TERMINAL VOLTAGE (IG1) Click here

    OK

  2. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Check if the same DTCs are output Click here.

      Tech Tips

      Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

      Result
      Result Proceed to
      DTC is output (for LHD) A
      DTC is output (for RHD) B
      DTC is not output (When troubleshooting in accordance with Diagnostic Trouble Code Chart) C
      DTC is not output (When troubleshooting in accordance with Problem Symptoms Table) D

    A

    REPLACE MASTER CYLINDER SOLENOID Click here

    B

    REPLACE MASTER CYLINDER SOLENOID Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

    D

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  3. CHECK TERMINAL VOLTAGE (IG1)


    1. Disconnect the A7 skid control ECU connector.

    2. B001HVGE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A7-46 (IG1) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (GND1, GND2, AND GND3 TERMINAL)


    1. Disconnect the A7 and A8 skid control ECU connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A7-1 (GND1) - Body ground Always Below 1 Ω
      A7-32 (GND2) - Body ground Always Below 1 Ω
      A8-4 (GND3) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Check if the same DTCs are output Click here.

      Tech Tips

      Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

      Result
      Result Proceed to
      DTC is output (for LHD) A
      DTC is output (for RHD) B
      DTC is not output (When troubleshooting in accordance with Diagnostic Trouble Code Chart) C
      DTC is not output (When troubleshooting in accordance with Problem Symptoms Table) D

    A

    REPLACE MASTER CYLINDER SOLENOID Click here

    B

    REPLACE MASTER CYLINDER SOLENOID Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

    D

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here