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Home >> Lexus >> 2021 >> UX 200 Luxury >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (Diagnostic Codes) (1 Of 2) (Except Hybrid) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model) >> DTC C0040-9E: Brake Pedal Switch "A" Stuck On; DTC C0040-9F: Brake Pedal Switch "A" Stuck Off [10/2018 - 07/2022] >> Description

DTC C0040-9E: Brake Pedal Switch "A" Stuck On; DTC C0040-9F: Brake Pedal Switch "A" Stuck Off [10/2018 - 07/2022]: Description

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

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

DTC No. Detection Item DTC Detection Condition Trouble Area
C0040-9E Brake Pedal Switch "A" Stuck On Either of the following is detected:
  1. With the stop light switch off, the brake pedal load sensing switch on, and the master cylinder pressure less than 0.7 MPa (7.13 kgf/cm2 , 101 psi), the vehicle acceleration rate is more than -0.8 m/s2 for 10 seconds or more. (Only when the engine is running and booster malfunctions are not detected.)
  2. Condition which the brake pedal load sensing switch 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
C0040-9F Brake Pedal Switch "A" Stuck Off Either of the following is detected:
  1. With the stop light switch on, the brake pedal load sensing switch off, and the master cylinder pressure more than 6 MPa (61.2 kgf/cm2 , 870 psi), the vehicle acceleration rate is less than -4 m/s2 for 1 second or more.
  2. With the stop light switch on, the brake pedal load sensing switch off, and the master cylinder pressure more than 6 MPa (61.2 kgf/cm2 , 870 psi), 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
DTC DETECTION CONDITIONS: C0040-9E

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition - - -
Malfunction Status With the stop light switch off, the brake pedal load sensing switch on, and the master cylinder pressure less than 0.7 MPa (7.13 kgf/cm2 , 101 psi), the vehicle acceleration rate is more than -0.8 m/s2 . (Only when the engine is running and booster malfunctions are not detected.) ◦ -
Condition which the brake pedal load sensing switch 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.

DTC DETECTION CONDITIONS: C0040-9F

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition - - -
Malfunction Status With the stop light switch on, the brake pedal load sensing switch off, and the master cylinder pressure more than 6 MPa (61.2 kgf/ cm2 , 870 psi), the vehicle acceleration rate is less than -4 m/s2 . ◦ -
With the stop light switch on, the brake pedal load sensing switch off, and the master cylinder pressure more than 6 MPa (61.2 kgf/ cm2 , 870 psi), 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.

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