DTC C1429: Open or Short in Brake Pedal Load Sensing Switch [08/2015 - 08/2019]: Procedure

1. Turn the ignition switch off.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch to ON.
4. Turn the Techstream on.
5. Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
   ABS/VSC/TRAC
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Brake Pedal Load Sensing SW	Brake pedal load sensing switch/ ON or OFF	ON: Brake pedal depressed beyond specified point OFF: Brake pedal not depressed beyond specified point	-

6. Check that the brake pedal load sensing switch display observed on the Techstream changes according to the brake pedal operation.

   OK

   The Techstream displays ON or OFF according to brake pedal operation.

Result: 

NG 

See step  3

Result: 

OK 

See step  2

1. Turn the ignition switch off.
2. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
3. Start the engine.
4. Perform a road and braking test.
5. Check if the same DTC is output (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
   RESULT
   
   

   Result	Proceed to
   DTC is not output	A
   DTC is output	B

Result: 

A 

USE SIMULATION METHOD TO CHECK 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - 08/2019] )

Result: 

B 

REPLACE BRAKE ACTUATOR ASSEMBLY 

(Refer to REMOVAL [08/2015 - 08/2019] )

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Turn the ignition switch off.
2. Make sure that there is no looseness in the locking part and connecting part of the connector.
3. Disconnect the A55 brake pedal load sensing switch connector.
4. 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 depressed	0.9 to 1.1 kΩ
   	Brake pedal released	192 to 234 Ω

Result: 

NG 

REPLACE BRAKE WITH SWITCH PEDAL SUB-ASSEMBLY 

(Refer to REMOVAL [08/2015 - ] )

Result: 

OK 

See step  4

1. Make sure that there is no looseness in the locking part and connecting part of the connector.
2. Disconnect the A53 skid control ECU (brake actuator assembly) connector.
3. Disconnect the A55 brake pedal load sensing switch connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A53-27 (FSW+) - A55-2 (FSW+)	Always	Below 1 Ω
   A53-27 (FSW+) - Body ground	Always	10 kΩ or higher
   A55-1 (FSW-) - Body ground	Always	Below 1 Ω

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY 

(Refer to REMOVAL [08/2015 - 08/2019] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR