DTC C0040-13: Brake Pedal Switch "A" Circuit Open [09/2018 - 10/2023]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Select the Data List using the Techstream.

   Refer to DATA LIST / ACTIVE TEST [09/2018 - 10/2023]

   Chassis > Brake > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Brake Pedal Load Sensing SW	Brake pedal load sensing switch	OFF / ON	OFF: Brake pedal released ON: Brake pedal depressed	-

   Chassis > Brake > Data List 

   Tester Display
   Brake Pedal Load Sensing SW

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

   OK

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  3

Result: 

OK 

See step  2

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [09/2018 - 10/2023]

   Chassis > Brake > Clear DTCs 

2. Turn the engine switch off.
3. Start the engine.
4. Perform a road test.
5. Check if the same DTC is output.

   Refer to DTC CHECK / CLEAR [09/2018 - 10/2023]

   Chassis > Brake > Trouble Codes 

   Result

   Result	Proceed to
   DTC C0040-13 is not output.	A
   DTC C0040-13 is output.	B

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 10/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 11/2021]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 10/2023] 

Result: 

B 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [09/2018 - 10/2020]  , or refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

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

   Refer to ON-VEHICLE INSPECTION [12/2017 - 10/2023]

   OK

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE BRAKE PEDAL SUPPORT ASSEMBLY. Refer to  REMOVAL [09/2018 - 10/2020]  , or refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

Result: 

OK 

See step  4

1. Make sure that there is no looseness at the locking part and the connecting part of the connector.
2. Disconnect the A9 skid control ECU (brake actuator assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A9- 27 (FSW+) - A5- 2 (FSW+)	Always	Below 1 Ω
   A9- 27 (FSW+) or A5- 2 (FSW+) - Body ground	Always	10 kΩ or higher
   A5- 1 (FSW-) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [09/2018 - 10/2020]  , or refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR