VEHICLE STABILITY CONTROL SYSTEM, 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 No.

Detection Item

DTC Detection Condition

Trouble Area

C1241

Low Power Supply Voltage Malfunction

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

C173289E09

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 engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Start the engine.

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

      Chassis > ABS/VSC/TRC > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      IG1 Voltage Value

      IG1 voltage value

      Min.: 0.00 V, Max.: 20.00 V

      Engine switch on (IG): 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.

      Result

      Result

      OK

      NG
    NG

    CHECK TERMINAL VOLTAGE (IG1)Click here

    OK

  2. RECONFIRM DTC

    1. Clear the DTCs.

      Click here

      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Check if the same DTCs are output.

      Click here

      Tip:

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

      Result

      Result

      Proceed to

      DTC is output

      A

      DTC is not output (When troubleshooting in accordance with Diagnostic Trouble Code Chart)

      B

      DTC is not output (When troubleshooting in accordance with Problem Symptoms Table)

      C

      Chassis > ABS/VSC/TRC > Trouble Codes

    A

    REPLACE MASTER CYLINDER SOLENOID

    Click here

    B

    USE SIMULATION METHOD TO CHECK

    Click here

    C

    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. C214161C02

      *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

      Engine switch on (IG)

      11 to 14 V

      Result

      Result

      OK

      NG
    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

      Result

      Result

      OK

      NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. RECONFIRM DTC

    1. Clear the DTCs.

      Click here

      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Check if the same DTCs are output.

      Click here

      Tip:

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

      Result

      Result

      Proceed to

      DTC is output

      A

      DTC is not output (When troubleshooting in accordance with Diagnostic Trouble Code Chart)

      B

      DTC is not output (When troubleshooting in accordance with Problem Symptoms Table)

      C

      Chassis > ABS/VSC/TRC > Trouble Codes

    A

    REPLACE MASTER CYLINDER SOLENOID

    Click here

    B

    USE SIMULATION METHOD TO CHECK

    Click here

    C

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here