VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1441

DESCRIPTION

The skid control ECU (brake actuator assembly) judges brake failure conditions have occurred based on signals from the brake pedal load sensing switch and master cylinder pressure sensor. (for 1AD-FTV)

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 ignition switch to ON.

• Bleeding is performed with the engine running or the ignition switch to ON.

• The accelerator and brake pedals are depressed simultaneously.*

CAUTION / NOTICE / HINT

PROCEDURE

1. 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.

      Tech Tips

      The skid control ECU (brake actuator assembly) 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.

      Result
      Proceed to OK NG

   
   

   NG

   END

   OK

2. CHECK DTC AND FREEZE FRAME DATA

   
   

   1. Check and record DTCs and Freeze Frame Data.

      for Check DTCs: Click here

      for Freeze Frame Data: Click here

      
      Chassis > ABS/VSC/TRC > Trouble Codes

      Tech Tips

      
      

      • 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 %".

      Result
      Proceed to NEXT

   
   

   NEXT

3. CLEAR DTC

   
   

   1. Clear the DTCs and Freeze Frame Data.

      for Clear DTCs: Click here

      for Freeze Frame Data: Click here

      
      Chassis > ABS/VSC/TRC > Clear DTCs

      Result
      Proceed to NEXT

   
   

   NEXT

4. 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

   
   

   B

   CHECK BRAKE FLUID LEVEL Click here

   C

   RECONFIRM DTC Click here

   A

5. CHECK BRAKE BOOSTER ASSEMBLY

   
   

   1. Check the brake booster assembly.

      for LHD: Click here

      for RHD: Click here

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

      Tech Tips

      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.

   
   

   A

   INSPECT RELATED COMPONENTS (FOR VACUUM LEAKS OR CLOGS)

   B

   GO TO STEP 7 Click here

6. CHECK BRAKE FLUID LEVEL

   
   

   1. Check the brake fluid level is sufficient.

      Tech Tips

      
      

      • If the fluid level is low, check for 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 sufficient. A Brake fluid level is sufficient. B

      Tech Tips

      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.

   
   

   A

   CHECK AND REPAIR BRAKE FLUID LEAKS

   B

7. RECONFIRM DTC

   
   

   1. Clear the DTCs.

      Click here

      
      Chassis > ABS/VSC/TRC > Clear DTCs

   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 ignition switch ON.

   4. Check if the same DTC is recorded.

      Click here

      
      Chassis > ABS/VSC/TRC > Trouble Codes

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

      Tech Tips

      
      

      • 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 %".

   
   

   A

   END

   B

   CHECK AND REPAIR APPLICABLE PART

   C

8. CHECK BRAKE PEDAL SUPPORT ASSEMBLY

   

   *1	Brake Pedal Support Assembly
   *2	Brake Pedal Load Sensing Switch
   *a	Matchmark

   
   

   1. Check that the matchmarks on the adjustment part of the brake pedal load sensing switch are aligned with the matchmarks on the brackets, nuts, adjusting screw, etc.

      OK
      The matchmarks on the adjustment part of the brake pedal load sensing switch are aligned with the matchmarks on the brackets, nuts, adjusting screw, etc.

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE BRAKE ACTUATOR ASSEMBLY Click here

   NG

   REPLACE BRAKE PEDAL SUPPORT ASSEMBLY for LHD: Click here REPLACE BRAKE PEDAL SUPPORT ASSEMBLY for RHD: Click here