DTC C1429: Open or Short in Brake Pedal Load Sensing Switch: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Select the Data List on the Techstream. Refer to DATA LIST / ACTIVE TEST .
   DATA LIST
   
   

   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 the specified point OFF: Brake pedal not depressed beyond the specified point	-

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

   OK

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

NG → See step   3 

OK: Go to next step 

1. Turn the engine 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
   DTC (C1429) is not output	A
   DTC (C1429) is output	B

B → See step   6 

A → See step   5 

Fig 1: Inspecting Brake Pedal Load Sensing Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Turn the engine 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.
   Fig 2: Identifying Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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
   A58-27 (FSW+) - A23-2 (FSW+)	Always	Below 1 Ω
   A58-27 (FSW+) - Body ground	Always	10 kΩ or higher
   A23-1 (GND) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   6