Toyota CH-R Service Manual: Open or Short in Brake Pedal Load Sensing Switch (C1429)

Toyota CH-R Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Open or Short in Brake Pedal Load Sensing Switch (C1429)

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

C1429

Open or Short in Brake Pedal Load Sensing Switch

An open or short in the brake pedal load sensing switch circuit continues for 0.5 seconds or more.
  • Brake pedal load sensing switch (Brake pedal support assembly)
  • Brake pedal load sensing switch circuit
  • Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

When C1249, C1425 and/or C1426 is output together with C1429, inspect and repair the trouble areas indicated by C1249, C1425 and/or C1426 first: (Click here ), (Click here ), and/or Click here )).

PROCEDURE

1.

READ VALUE USING TECHSTREAM (BRAKE PEDAL LOAD SENSING SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Select the Data List using the Techstream.

Click here

Chassis > ABS/VSC/TRAC/EPB > 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 a specified point

OFF: Brake pedal not depressed beyond a specified point

-

(d) 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

GO TO STEP 3

OK

2.

RECONFIRM DTC

(a) Turn the ignition switch off.

(b) Clear the DTCs.

Click here

(c) Turn the ignition switch off.

(d) Start the engine.

(e) Perform a road test.

(f) Check if the same DTC is output.

Click here

Result

Proceed to

DTC C1429 is not output.

A

DTC C1429 is output.

B
A

USE SIMULATION METHOD TO CHECK

B

REPLACE BRAKE ACTUATOR ASSEMBLY

3.

INSPECT BRAKE PEDAL LOAD SENSING SWITCH

(a) Turn the ignition switch off.

*a

Component without harness connected

(Brake Pedal Load Sensing Switch (Brake Pedal Support Assembly))

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

(c) Disconnect the A63 brake pedal load sensing switch connector.

NOTICE:

  • Do not remove the brake pedal load sensing switch from the brake pedal support assembly.
  • When there is a malfunction in the brake pedal load sensing switch, replace the brake pedal support assembly.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

2 (FSW+) - 1 (FSW-)

Switch OFF (Brake pedal depressed)

950 to 1050 Ω

2 (FSW+) - 1 (FSW-)

Switch ON (Brake pedal released)

203 to 223 Ω
NG

REPLACE BRAKE PEDAL SUPPORT ASSEMBLY

OK

4.

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 A42 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

A42-17 (FSW+) - A63-2 (FSW+)

Always

Below 1 Ω

A42-17 (FSW+) - Body ground

Always

10 kΩ or higher

A63-2 (FSW+) - Body ground

Always

10 kΩ or higher

A63-1 (FSW-) - Body ground

Always

Below 1 Ω
OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    Motor Circuit Malfunction (C1428)
    DESCRIPTION This DTC is stored when the skid control ECU (brake actuator assembly) judges that an abnormality occurred in the circuit used to operate the pump motor. DTC No. ...

    Brake Pedal Load Sensing Switch OFF Stuck Malfunction (C1430,C1431)
    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 bra ...

    Other materials:

    Toyota CH-R Service Manual > Lighting System: Light Sensor Circuit Malfunction (B1244)
    DESCRIPTION The automatic light control sensor detects ambient light. The sensor creates an electrical signal based on the amount of light detected, and sends the signal to the main body ECU (multiplex network body ECU). The main body ECU (multiplex network body ECU) turns on or off the headl ...

    Toyota CH-R Service Manual > Automatic High Beam System: System Description
    SYSTEM DESCRIPTION AUTOMATIC HIGH BEAM SYSTEM (a) General The automatic high beam system enhances the illumination of the area in front of the vehicle to improve visibility for the driver. It works by detecting light from the front of the vehicle, using the forward recognition camera, and tur ...

    Toyota CH-R Owners Manual

    Toyota CH-R Service Manual

    © 2017-2024 Copyright www.tochr.net
    0.0107