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 | |
C1430 | Brake Pedal Load Sensing Switch OFF Stuck Malfunction |
Either of the following is detected:
- 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.
- 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
| | C1431 |
Brake Pedal Load Sensing Switch ON Stuck Malfunction |
Either of the following is detected:
- 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.)
- 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 3
times in succession.
|
- Brake pedal load sensing switch (Brake pedal support assembly)
- Brake pedal load sensing switch circuit
| WIRING DIAGRAM
Refer to DTC C1429. Click here  CAUTION / NOTICE / HINT
HINT: When
C1249, C1425 and/or C1426 is output together with C1430 and/or C1431,
inspect and repair the trouble areas indicated by C1249, C1425 and/or
C1426 first (Click here ), (Click here
), and/or (Click here
). PROCEDURE
| 1. |
READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH ASSEMBLY AND BRAKE PEDAL LOAD SENSING SWITCH) |
(a) Connect the Techstream to the DLC3. (b) Turn the ignition switch to ON.
(c) Select the Data List using the Techstream. Click here
ABS/VSC/TRAC |
Tester Display | Measurement Item |
Range | Normal Condition |
Diagnostic Note | |
Stop Light SW | Stop light switch assembly |
ON or OFF | ON: Brake pedal depressed
OFF: Brake pedal released |
- | | 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 |
- | (d)
Check that the stop light switch display and brake pedal load sensing
switch display observed on the Techstream change according to brake
pedal operation. OK: The Techstream displays ON or OFF according to brake pedal operation.
(e) Slowly depress the brake pedal, and check when the stop light switch and brake pedal load sensing switch turn on.
OK: First the stop light switch turns on, and then the brake pedal load sensing switch turns on.
|
Result | Proceed to | |
OK | A | |
NG (Turning on of the brake pedal load sensing switch is not confirmed.) |
B | | NG (The brake pedal load sensing switch turns on first.) |
C |
| B |
 | GO TO STEP 3 |
| C |
| GO TO STEP 4 |
|
A |
 | |
(a) Turn the ignition switch off.
(b) Clear the DTCs. Click here
(c) Turn the ignition switch off. (d) Start the engine. (e) Perform a road test.
(f) Check if the same DTC is output. Click here
|
Result | Proceed to | |
DTCs C1430 and C1431 are not output. |
A | | DTCs C1430 and C1431 are output. |
B |
| A |
| USE SIMULATION METHOD TO CHECK |
| B |
| REPLACE BRAKE ACTUATOR ASSEMBLY |
| 3. |
INSPECT BRAKE PEDAL SUPPORT ASSEMBLY | (a) Turn the ignition switch off.
(b) Inspect the brake pedal load sensing switch (brake pedal support assembly).
Click here OK: The brake pedal load sensing switch (brake pedal support assembly) is normal.
| OK |
| REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG |
| REPLACE BRAKE PEDAL SUPPORT ASSEMBLY |
| 4. |
CHECK BRAKE PEDAL AND STOP LIGHT SWITCH ASSEMBLY INSTALLATION |
(a) Turn the ignition switch off. (b) Check the brake pedal height.
Click here (c) Check the stop light switch assembly installation.
Click here OK: The brake pedal height and stop light switch assembly installation are normal.
| OK |
| REPLACE BRAKE PEDAL SUPPORT ASSEMBLY |
| NG |
| ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH ASSEMBLY | | 
