RM35X0E _54 Brake _078667 BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS _0385049 ELECTRONICALLY CONTROLLED BRAKE SYSTEM(w/ VSC OFF Switch) C

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS  ELECTRONICALLY CONTROLLED BRAKE SYSTEM(w/ VSC OFF Switch)  C00409E  Brake Pedal Switch "A" Stuck On  C00409F  Brake Pedal Switch "A" Stuck Off  


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
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



DTC Detection Conditions: C00409E
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: C00409F
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.


PROCEDURE

1.READ VALUE USING GTS (STOP LIGHT SWITCH ASSEMBLY AND BRAKE PEDAL LOAD SENSING SWITCH)
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Select the Data List using the GTS.

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/ VSC OFF Switch)>DATA LIST / ACTIVE TEST

Chassis > Brake > Data List
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
HINT:

The brake pedal state is determined using the voltage at terminal STP


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 		-
Chassis > Brake > Data List
Tester Display
Stop Light SW
Brake Pedal Load Sensing SW
50003 435 59,61

d.

Check that the stop light switch display and brake pedal load sensing switch display observed on the GTS change according to brake pedal operation.

OK:

The GTS 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:
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

2.CLEAR DTC

B

4.INSPECT BRAKE PEDAL LOAD SENSING SWITCH

C

6.CHECK BRAKE PEDAL AND STOP LIGHT SWITCH ASSEMBLY INSTALLATION
2.CLEAR DTC
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Operate the GTS to clear the codes. Enter the following menus: Chassis / Brake / Trouble Codes.

Chassis > Brake > Clear DTCs
50002 435

d.

Press the DTC clear button.


Result:
Proceed to
NEXT



NEXT

3.RECONFIRM DTC
3.RECONFIRM DTC
a.

Connect the GTS to the DLC3.


b.

Start the engine.


c.

Perform a road test under the same malfunction conditions recreated based on the Freeze Frame Data or customer problem analysis.


d.

Read the DTCs following the prompts on the GTS. Enter the following menus: Chassis / Brake / Trouble Codes.

Chassis > Brake > Trouble Codes
50001 435

e.

Check if the same DTC is output.


Result:
Result Proceed to
C00409E and C00409F is not output A
C00409E and/or C00409F is output B



A

END

B

REPLACE BRAKE ACTUATOR ASSEMBLY

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>BRAKE ACTUATOR>REMOVAL


4.INSPECT BRAKE PEDAL LOAD SENSING SWITCH
a.

Inspect the brake pedal load sensing switch (brake pedal support assembly).

for LHD: Click hereBrake>BRAKE SYSTEM (OTHER)>BRAKE PEDAL (for LHD)>ON-VEHICLE INSPECTION

for RHD: Click hereBrake>BRAKE SYSTEM (OTHER)>BRAKE PEDAL (for RHD)>ON-VEHICLE INSPECTION

OK:

The brake pedal load sensing switch (brake pedal support assembly) is normal.



Result:
Proceed to
OK
NG



OK

5.CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - BRAKE PEDAL LOAD SENSING SWITCH)

NG

REPLACE BRAKE PEDAL SUPPORT ASSEMBLY

for LHD: Click hereBrake>BRAKE SYSTEM (OTHER)>BRAKE PEDAL (for LHD)>REMOVAL

for RHD: Click hereBrake>BRAKE SYSTEM (OTHER)>BRAKE PEDAL (for RHD)>REMOVAL


5.CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - BRAKE PEDAL LOAD SENSING SWITCH)
a.

Make sure that there is no looseness at the locking part and the connecting part of the connector.


b.

Disconnect the A28 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
A28-36 (FSW+) - M5-2 (FSW+) Always Below 1 Ω
A28-36 (FSW+) - Body ground Always 10 kΩ or higher
M5-2 (FSW+) - Body ground Always 10 kΩ or higher
M5-1 (FSW-) - Body ground Always Below 1 Ω


Result:
Proceed to
OK
NG



OK

REPLACE BRAKE ACTUATOR ASSEMBLY

Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>BRAKE ACTUATOR>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR