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 |
|---|---|---|---|
| C00409E | 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 |
| C00409F | 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 |
| 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 | |
DTC will be output when conditions for either of the patterns in the table above are met.
| 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 | |
DTC will be output when conditions for either of the patterns in the table above are met.
When P057112, and/or P057113 is output together with C00409E and/or C00409F, inspect and repair the trouble areas indicated by P057112, and/or P057113 first (Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model)>P057112202409,999999,_54,_083077,_0402316,RM100000002NJ3E,P057112), and/or (Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model)>P057113202409,999999,_54,_083077,_0402316,RM100000002NJ3L,P057113)
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Select the Data List using the GTS.
| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| Stop Light SW | Stop light switch assembly (STP terminal input) | OFF / ON | OFF: Brake pedal released
ON: Brake pedal depressed |
|
| Brake Pedal Load Sensing SW | Brake pedal load sensing switch (brake pedal support assembly) | OFF / ON | OFF: Brake pedal load sensing switch (brake pedal support assembly) OFF
ON: Brake pedal load sensing switch (brake pedal support assembly) ON |
- |
| Tester Display |
|---|
| Stop Light SW |
| Brake Pedal Load Sensing SW |
Check that the stop light switch display and brake pedal load sensing switch display observed on the GTS change according to brake pedal operation.
The GTS displays ON or OFF according to brake pedal operation.
Slowly depress the brake pedal, and check when the stop light switch and brake pedal load sensing switch turn on.
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 |
A
B
C
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Operate the GTS to clear the codes. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.
Press the DTC clear button.
| Proceed to |
|---|
| NEXT |
NEXT
Connect the GTS to the DLC3.
Start the engine.
Perform a road test under the same malfunction conditions recreated based on the Freeze Frame Data or customer problem analysis.
Read the DTCs following the prompts on the GTS. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.
Check if the same DTC is output.
| Result | Proceed to |
|---|---|
| C00409E and C00409F is not output | A |
| C00409E and/or C00409F is output | B |
A
B
Inspect the brake pedal load sensing switch (brake pedal support assembly).
The brake pedal load sensing switch (brake pedal support assembly) is normal.
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Make sure that there is no looseness at the locking part and the connecting part of the connector.
Disconnect the A39 skid control ECU (brake actuator assembly) connector.
Measure the resistance according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A39-10 (FSW+) - A43-2 (FSW+) | Always | Below 1 Ω |
| A39-10 (FSW+) - Body ground | Always | 10 kΩ or higher |
| A43-2 (FSW+) - Body ground | Always | 10 kΩ or higher |
| A43-1 (FSW-) - Body ground | Always | Below 1 Ω |
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Turn the ignition switch off.
Check the brake pedal height.
Check the stop light switch assembly installation.
The brake pedal height and stop light switch assembly installation are normal.
| Proceed to |
|---|
| OK |
| NG |
OK
NG