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Home >> Lexus >> 2021 >> LS 500 Base, AWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/ Vacuum Brake Booster) - Diagnostic Codes (3 Of 4) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/ Vacuum Brake Booster) >> DTC C1430: Brake Pedal Load Sensing Switch OFF Stuck Malfunction; DTC C1431: Brake Pedal Load Sensing Switch ON Stuck Malfunction [12/2017 - 09/2018] >> Description

DTC C1430: Brake Pedal Load Sensing Switch OFF Stuck Malfunction; DTC C1431: Brake Pedal Load Sensing Switch ON Stuck Malfunction [12/2017 - 09/2018]: Description

The brake pedal load sensing switch signal 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.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
C1430 Brake Pedal Load Sensing Switch OFF Stuck Malfunction Either of the following is detected:
  • With the stop light switch signal on, the brake pedal load sensing switch signal off, and the master cylinder pressure 6 MPa (61.2 kgf/cm2 , 870 psi) or more, the deceleration is 0.4G or more for 1 second or more.
  • With the stop light switch signal on, the brake pedal load sensing switch signal off, and the master cylinder pressure 6 MPa (61.2 kgf/cm2 , 870 psi) or more, the vehicle speed is 0 km/h (0 mph) for 5 seconds or more.
  • Brake pedal load sensing switch (brake pedal support assembly)
  • Brake pedal load sensing switch circuit
  • Skid control ECU (brake actuator assembly)
 -
C1431 Brake Pedal Load Sensing Switch ON Stuck Malfunction Either of the following is detected:
  • With the stop light switch signal off, the brake pedal load sensing switch signal on, the master cylinder pressure below 0.7 MPa (71.1 kgf/cm2 , 101 psi), and the engine speed 500 rpm or higher, the deceleration is below 0.08 G for 10 seconds or more.
  • The condition that the brake pedal load sensing switch signal remains on while the vehicle speed increases from 0 km/h (0 mph) to 30 km/h (19 mph) occurs 5 times in succession.
  • Brake pedal load sensing switch (brake pedal support assembly)
  • Brake pedal load sensing switch circuit
  • Skid control ECU (brake actuator assembly)
 -
C1430 DTC DETECTION CONDITIONS

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition - - -
Malfunction Status With the stop light switch signal on, the brake pedal load sensing switch signal off, and the master cylinder pressure 6 MPa (61.2 kgf/cm2 , 870 psi) or more, the deceleration is 0.4 G or more ◦ -
With the stop light switch signal on, the brake pedal load sensing switch signal off, and the master cylinder pressure 6 MPa (61.2 kgf/cm2 , 870 psi) or more, the vehicle speed is 0 km/h (0 mph) - ◦
Detection Time 1 second or more. 5 seconds or more.
Number of Trips 1 trip 1 trip

HINT: 

DTC will be output when conditions for either of the patterns in the table above are met.

C1431 DTC DETECTION CONDITIONS

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition - - -
Malfunction Status With the stop light switch signal off, the brake pedal load sensing switch signal on, the master cylinder pressure below 0.7 MPa (71.1 kgf/cm2 , 101 psi), and the engine speed 500 rpm or higher, the deceleration is below 0.08 G ◦ -
The condition that the brake pedal load sensing switch signal remains on while the vehicle speed increases from 0 km/h (0 mph) to 30 km/h (19 mph) occurs 5 times in succession - ◦
Detection Time 10 seconds or more. -
Number of Trips 1 trip 1 trip

HINT: 

DTC will be output when conditions for either of the patterns in the table above are met.

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