VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1441

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DESCRIPTION

The skid control ECU judges brake failure conditions have occurred based on the signal from the brake pedal load sensing switch and master cylinder pressure sensor.

DTCs may be stored if one of the following occurs:

• The brake pedal load sensing switch is malfunctioning (deviation in characteristics).

• The brake pedal is depressed when moving the vehicle with the engine not running and the engine switch on (IG).

• Bleeding is performed with the engine running or the engine switch on (IG).

• Accelerator and brake pedals depressed simultaneously.*

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INSPECTION PROCEDURE

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PROCEDURE

1. Click here

   CHECK ACCELERATOR PEDAL AND BRAKE PEDAL OPERATION

   
   

   1. Interview the customer to check if the pedals were depressed simultaneously while driving or braking.

      OK
      The pedals were not depressed simultaneously.

      Tip:

      The skid control ECU may store this DTC upon judging that a stuck on malfunction has occurred when the accelerator pedal and brake pedal are depressed simultaneously.

      If the pedals were depressed simultaneously, clear the DTC because it is not a malfunction.

   
   
   • OKClick here
   • NGClick here
2. Click here

   CHECK DTC AND FREEZE FRAME DATA

   
   

   1. Check and record DTCs and Freeze Frame Data (Click hereandClick here).

      Tip:

      Read Freeze Frame Data at the time DTC C1441 was stored, go to operation history and confirm the operating conditions.

      When reading Freeze Frame Data to confirm operating conditions, the following items can be confirmed: "F# or R# Wheel Speed", "Vehicle Speed", "Real Engine Torque" and "Accelerator Opening Angle %".

   
   
   • NEXTClick here
3. Click here

   CLEAR DTC

   
   

   1. Clear the DTCs and Freeze Frame Data (Click hereandClick here).

   
   
   • NEXTClick here
4. Click here

   CHECK BRAKE PEDAL OPERATION

   
   

   1. Based on the customer problem analysis, confirm the brake pedal condition at the time the brake pedal was operated.

      Result
      Result Proceed to The brake pedal is hard to depress. A The brake pedal is extremely easy to depress. B Neither of the above conditions. (Problem symptom does not occur.) C

   
   
   • AClick here
   • BClick here
   • CClick here
5. Click here

   CHECK BRAKE BOOSTER ASSEMBLY

   
   

   1. Check the brake booster assembly (Click here).

      Result
      Result Proceed to The brake booster assembly is abnormal. A The brake booster assembly is normal. B

      Tip:

      If the result shows that the brake booster assembly is defective, check the related components such as the brake booster, brake vacuum check valve, check valve grommet, brake booster gasket, vacuum hose and intake system for vacuum leaks or clogs.

   
   
   • AClick here
   • BClick here
6. Click here

   CHECK BRAKE FLUID LEVEL

   
   

   1. Check that the brake fluid level is sufficient.

      Tip:
      

      • If the fluid level drops, check for a fluid leaks, and repair as necessary.

      • Check for brake fluid leakage. (brake master cylinder, brake line, flexible hose, brake actuator, wheel cylinders, etc.)

      Result
      Result Proceed to Brake fluid level is not proper. A Brake fluid level is proper. B

      Tip:

      If brake fluid leaks are not found in components such as the brake master cylinder, brake line, flexible hose, brake actuator or wheel cylinders but the fluid level has become lower, the brake master cylinder may be leaking internally. Therefore, replace the brake master cylinder and check brake pedal operation again.

   
   
   • AClick here
   • BClick here
7. Click here

   RECONFIRM DTC

   
   

   1. Clear the DTCs (Click here).

   2. Start the engine.

   3. Perform a road test.

      Note:

      Do not intentionally stop the engine when driving. DTC C1441 will be stored if the brake pedal is depressed when moving the vehicle with the engine not running and the engine switch on (IG).

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

      Result
      Result Proceed to DTC C1441 is not output. A DTCs C1441 and other DTC are output. B Only DTC C1441 is output. C

      Tip:

      If DTC C1441 and other DTCs are output simultaneously, the other DTCs may have caused the engine to malfunction, resulting in DTC C1441 to be output. Read Freeze Frame Data to confirm malfunctioning parts and repair the applicable part.

      When reading Freeze Frame Data to confirm malfunctioning parts, the following items can be confirmed: "F# or R# Wheel Speed", "Vehicle Speed", "Real Engine Torque" and "Accelerator Opening Angle %".

   
   
   • AClick here
   • BClick here
   • CClick here
8. Click here

   CHECK BRAKE PEDAL LOAD SENSING SWITCH

   
   
   1. 

      Check that the match marks on the adjustment part of the brake pedal load sensing switch are aligned with the match marks on the bracket, nut, adjusting screw, etc.

      OK
      The match marks on the adjustment part of the brake pedal load sensing switch are aligned with the match marks on the bracket, nut, adjusting screw, etc.

   
   
   • OKClick here
   • NGClick here
9. Click here

   INSPECT RELATED COMPONENTS (FOR VACUUM LEAKS OR CLOGS)

10. Click here

    CHECK AND REPAIR BRAKE FLUID LEAKS

11. Click here

    END

12. Click here

    REPLACE BRAKE ACTUATOR ASSEMBLYClick here

13. Click here

    CHECK AND REPAIR APPLICABLE PART

14. Click here

    REPLACE BRAKE PEDAL SUPPORT ASSEMBLYClick here