C1431

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1430, C1431: Brake Pedal Load Sensing Switch OFF Stuck Malfunction
C1431 - Brake Pedal Load Sensing Switch ON Stuck Malfunction

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.





WIRING DIAGRAM

Refer to DTC C1429 C1429.

INSPECTION PROCEDURE

HINT
When C1249, C1425 and/or C1426 is output together with C1430 and/or C1431, inspect and repair the trouble areas indicated by C1249, C1425 and/or C1426 first C1249, C1425, and/or C1426).

PROCEDURE

1. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH ASSEMBLY AND 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 Data List / Active Test.

ABS/VSC/TRAC





(d) Check that the stop light switch display and brake pedal load sensing switch display observed on the Techstream change according to brake pedal operation.

OK:

The Techstream displays on or off according to brake pedal operation.

(e) Slowly depress the brake pedal, and check when the stop light switch and brake pedal load sensing switch turn on.

OK:

First the stop light switch should turn ON, and then the brake pedal load sensing switch should turn ON.

Result:





B -- INSPECT BRAKE PEDAL LOAD SENSING SWITCH

C -- CHECK BRAKE PEDAL AND STOP LIGHT SWITCH ASSEMBLY INSTALLATION
A -- Continue to next step.

2. RECONFIRM DTC

(a) Turn the ignition switch off.

(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(c) Turn the ignition switch off.

(d) Start the engine.

(e) Perform a road test.

(f) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result:





B -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal

A -- CHECK FOR INTERMITTENT PROBLEMS How To Proceed With Troubleshooting

3. INSPECT BRAKE PEDAL LOAD SENSING SWITCH

(a) Turn the ignition switch off.





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

(c) Disconnect the 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:





Text in Illustration





NG -- REPLACE BRAKE PEDAL SUPPORT ASSEMBLY Removal
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - 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 skid control ECU connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal

5. CHECK BRAKE PEDAL AND STOP LIGHT SWITCH ASSEMBLY INSTALLATION

(a) Turn the ignition switch off.

(b) Check the brake pedal height and stop light switch assembly installation Adjustments.

OK:

The brake pedal height and stop light switch assembly installation are normal.

NG -- ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH ASSEMBLY Adjustments

OK -- REPLACE BRAKE PEDAL SUPPORT ASSEMBLY Removal