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VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1241/41

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DTC Code DTC Name
C1241/41 Low Battery Positive Voltage or Abnormally High Battery Positive Voltage
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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 brake control system operation.

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

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

DTC Code DTC Detection Condition Trouble Area
C1241/41

When any of the following is detected:


  1. Battery voltage is 16.8 V or higher.

  2. Battery voltage is 9.3 V or less when the brake control is not operating.

  3. Battery voltage is 9.2 V or less when the brake control operates.

  • ECU-IG NO. 1 fuse

  • Battery

  • Charging system

  • Power source circuit

  • Skid control ECU (Brake actuator assembly)
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

  • When replacing the skid control ECU (brake actuator assembly), perform the engine variant learning (Click here).

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

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PROCEDURE


  1. Click here

    CHECK HARNESS AND CONNECTOR (IG1 TERMINAL)


    1. Turn the ignition switch off.

    2. Disconnect the skid control ECU connector.

    3. A01ITVSE27

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A52 or A54-28 (IG1) - Body ground Ignition switch ON 11 to 14 V
      Table 1. Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)
      *2 for AD Series Engine
      *3 for ZR Series Engine

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    CHECK HARNESS AND CONNECTOR (GND1, GND2 TERMINAL)


    1. Turn the ignition switch off.

    2. Disconnect the skid control ECU connector.

    3. A01ITVSE28

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A52 or A54-4 (GND1) - Body ground Always Below 1 Ω
      A52 or A54-1 (GND2) - Body ground Always Below 1 Ω
      Table 2. Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)
      *2 for AD Series Engine
      *3 for ZR Series Engine

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    RECONFIRM DTC


    1. Clear the DTCs (Click here).

    2. Start the engine.

    3. Perform a road test.

    4. Check if the same DTC is output (Click here).

      Table 3. Result
      Result Proceed to
      DTC C1241/41 is not output. A
      DTC C1241/41 is output. B

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    USE SIMULATION METHOD TO CHECKClick here

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPLACE BRAKE ACTUATOR ASSEMBLYClick here