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 |
---|---|---|---|
C00409E | Brake Pedal Switch "A" Stuck On | Either of the following is detected:
|
|
C00409F | Brake Pedal Switch "A" Stuck Off | Either of the following is detected:
|
|
Vehicle Condition | |||
---|---|---|---|
Pattern 1 | Pattern 2 | ||
Diagnosis Condition | When the +BS terminal voltage is 9.5 V or higher | ○ | ○ |
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.
DTC Detection Conditions: C00409F Vehicle Condition | |||
---|---|---|---|
Pattern 1 | Pattern 2 | ||
Diagnosis Condition | When the +BS terminal voltage is from 9.5 to 17.4 V | ○ | ○ |
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 exceeding 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.
WIRING DIAGRAM
Refer to DTC C004013.
Click here
CAUTION / NOTICE / HINT
NOTICE:
After replacing the skid control ECU (brake actuator assembly), perform "Calibration".
Click here
HINT:
When P057111 and/or P057113 is output together with C00409E and/or C00409F, inspect and repair the trouble areas indicated by P057111 and/or P057113 first.
for P057111: Click here
for P057113: Click here
PROCEDURE
1. | READ VALUE USING TECHSTREAM (STOP LIGHT SW AND BRAKE PEDAL LOAD SENSING SW) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Select the Data List using the Techstream.
Click here
Chassis > Brake/EPB > Data List Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
---|---|---|---|---|
Stop Light SW | Stop light switch assembly | OFF / ON | OFF: Brake pedal released ON: Brake pedal depressed | - |
Brake Pedal Load Sensing SW | Brake pedal load sensing switch | OFF / ON | OFF: Brake pedal released ON: Brake pedal depressed | - |
Tester Display |
---|
Stop Light SW |
Brake Pedal Load Sensing SW |
(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 OFF / ON according to brake pedal operation.
(e) Slowly depress the brake pedal, and check when the stop light switch assembly and brake pedal load sensing switch turn on.
OK:
First the stop light switch assembly should turn on, and then the brake pedal load sensing switch should turn 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 4 |
C | GO TO STEP 6 |
|
2. | CLEAR DTC |
(a) Operate the Techstream to clear the codes. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.
Chassis > Brake/EPB > Clear DTCs(b) Press the DTC clear button.
(c) Turn the engine switch off.
|
3. | RECONFIRM DTC |
(a) Start the engine.
(b) Perform a road test.
(c) Read the DTCs following the prompts on the Techstream. Enter the following menus: Chassis / Brake/EPB / Trouble Codes.
Chassis > Brake/EPB > Trouble Codes(d) Check if the same DTC is output.
Result | Proceed to |
---|---|
DTC C00409E and C00409F are not output. | A |
DTC C00409E and/or C00409F are output. | B |
A | USE SIMULATION METHOD TO CHECK |
B | REPLACE BRAKE ACTUATOR ASSEMBLY |
4. | INSPECT BRAKE PEDAL SUPPORT ASSEMBLY |
(a) Turn the engine switch off. |
|
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(c) Disconnect the A51 brake pedal load sensing switch (brake pedal support assembly) connector.
NOTICE:
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) 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 |
NG | REPLACE BRAKE PEDAL SUPPORT ASSEMBLY |
|
5. | CHECK HARNESS AND CONNECTOR (BRAKE PEDAL SUPPORT ASSEMBLY - BRAKE ACTUATOR ASSEMBLY) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
OK:
The connector is securely connected.
(b) Disconnect the A41 skid control ECU (brake actuator assembly) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
A51-2 (FSW+) - A41-28 (FSW+) | Always | Below 1 Ω |
A51-2 (FSW+) or A41-28 (FSW+) - Body ground | Always | 10 kΩ or higher |
A51-1 (FSW-) - Body ground | 1 minute or more after disconnecting the cable from the negative (-) battery terminal | Below 1 Ω |
OK | REPLACE BRAKE ACTUATOR ASSEMBLY |
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |
6. | CHECK BRAKE PEDAL HEIGHT AND STOP LIGHT SWITCH ASSEMBLY INSTALLATION |
(a) Turn the engine switch off.
(b) Check the brake pedal height and 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 HEIGHT OR STOP LIGHT SWITCH ASSEMBLY INSTALLATION |
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