VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C1429

DESCRIPTION

The brake pedal load sensing switch (brake pedal support assembly) turns on when the brake pedal is depressed with a force exceeding a predetermined level.

The skid control ECU (brake actuator assembly) uses this circuit to detect if the brake pedal is depressed or not.

WIRING DIAGRAM

*a	Brake Pedal Load Sensing Switch (Brake Pedal Support Assembly)
*b	Skid Control ECU (Brake Actuator Assembly)

CAUTION / NOTICE / HINT

PROCEDURE

1. READ VALUE USING GTS (BRAKE PEDAL LOAD SENSING SWITCH)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the engine switch on (IG).

   3. Select the Data List using the GTS.

      Click here

      
      Chassis > ABS/VSC/TRC > Data List

      Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
      Brake Pedal Load Sensing SW	Brake pedal load sensing switch	ON or OFF	ON: Brake pedal depressed beyond a specified point OFF: Brake pedal not depressed beyond a specified point	-

      
      Chassis > ABS/VSC/TRC > Data List

      Tester Display
      Brake Pedal Load Sensing SW

   4. Check that the brake pedal load sensing switch display observed on the GTS changes according to brake pedal operation.

      OK
      The GTS displays ON or OFF according to brake pedal operation.

      Result
      Proceed to OK NG

   
   

   NG

   INSPECT BRAKE PEDAL SUPPORT ASSEMBLY Click here

   OK

2. RECONFIRM DTC

   
   

   1. Turn the engine switch off.

   2. Clear the DTCs.

      Click here

      
      Chassis > ABS/VSC/TRC > Clear DTCs

   3. Turn the engine switch off.

   4. Start the engine.

   5. Perform a road test.

   6. Check if the same DTC is output.

      Click here

      
      Chassis > ABS/VSC/TRC > Trouble Codes

      Result
      Result Proceed to DTC C1429 is not output. A DTC C1429 is output. B

   
   

   A

   USE SIMULATION METHOD TO CHECK Click here

   B

   REPLACE BRAKE ACTUATOR ASSEMBLY for LHD: Click here REPLACE BRAKE ACTUATOR ASSEMBLY for RHD: Click here

3. INSPECT BRAKE PEDAL SUPPORT ASSEMBLY

   
   
   1. 

      *a	Component without harness connected (Brake Pedal Load Sensing Switch (Brake Pedal Support Assembly))

      Turn the engine switch off.

   2. Make sure that there is no looseness at the locking part and the connecting part of the connector.

   3. Disconnect the A55 brake pedal load sensing switch (brake pedal support assembly) connector.

      Note

      
      

      • Do not remove the brake pedal load sensing switch from the brake pedal support assembly.

      • When there is a malfunction in the brake pedal load sensing switch, replace the brake pedal support assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition 2 (FSW+) - 1 (FSW-) Brake pedal load sensing switch off (Brake pedal depressed) 950 to 1050 Ω 2 (FSW+) - 1 (FSW-) Brake pedal load sensing switch on (Brake pedal released) 203 to 223 Ω

      Result
      Proceed to OK NG

   
   

   NG

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

   OK

4. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - BRAKE PEDAL SUPPORT ASSEMBLY)

   
   

   1. Make sure that there is no looseness at the locking part and the connecting part of the connector.

   2. Disconnect the A105 skid control ECU (brake actuator assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition A105-23 (FSW+) - A55-2 (FSW+) Always Below 1 Ω A105-23 (FSW+) or A55-2 (FSW+) - Body ground Always 10 kΩ or higher A55-1 (FSW-) - Body ground Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE BRAKE ACTUATOR ASSEMBLY for LHD: Click here REPLACE BRAKE ACTUATOR ASSEMBLY for RHD: Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR