Toyota Tundra Service Manual: 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 0.3 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

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 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 SUPPORT ASSEMBLY

(a) Turn the ignition switch off.

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

Click here

OK:

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

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 A57 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

A57-17 (FSW+) - A66-2 (FSW+)

Always

Below 1 Ω

A57-17 (FSW+) or A66-2 (FSW+) - Body ground

Always

10 kΩ or higher

A66-1 (FSW-) - Body ground

Always

Below 1 Ω

OK

REPLACE BRAKE ACTUATOR ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    Motor Circuit Malfunction (C1428)

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

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