DTC C1430: Brake Pedal Load Sensing Switch OFF Stuck Malfunction; DTC C1431: Brake Pedal Load Sensing Switch ON Stuck Malfunction: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Chassis / ABS/VSC/ TRAC / Data List.
5. Select the Data List on the Techstream. Refer to DATA LIST / ACTIVE TEST .
   ABS/VSC/TRAC
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Stop Light SW	Stop light switch / 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 the specified point OFF: Brake pedal not depressed beyond the specified point	-

6. 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.

7. 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 should turn ON, and then the brake pedal load sensing switch should turn 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

B → See step   3 

C → See step   5 

A: Go to next step 

1. Turn the ignition switch off.
2. Clear the DTCs. Refer to DTC CHECK / CLEAR .
3. Start the engine.
4. Perform the road test.
5. Check if the same DTC is recorded. Refer to DTC CHECK / CLEAR .
   RESULT
   
   

   Result	Proceed to
   DTCs (C1430 and C1431) are not output	A
   DTCs (C1430 and/or C1431) are output	B

B → See step   8 

A → See step   6 

Fig 1: Inspecting Brake Pedal Load Sensing Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Turn the ignition switch off.
2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
3. Disconnect the brake pedal load sensing switch connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   2 (FSW+) - 1 (GND)	Brake pedal load sensing switch OFF (Brake pedal depressed)	950 to 1050 Ω
   2 (FSW+) - 1 (GND)	Brake pedal load sensing switch ON (Brake pedal released)	203 to 223 Ω

NG → See step   7 

OK: Go to next step 

1. Make sure that there is no looseness at the locking part and the connecting part of the connector.
2. Disconnect the skid control ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A4-27 (FSW+) - A7-2 (FSW+)	Always	Below 1 Ω
   A4-27 (FSW+) - Body ground	Always	10 kΩ or higher
   A7-1 (GND) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   8 

1. Turn the ignition switch off.
2. Check the brake pedal height and stop light switch installation. Refer to INSTALLATION .

   OK

   The brake pedal height and stop light switch installation are normal.

NG → See step   9 

OK → See step   7