C1429

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1429: Open or Short in Brake Pedal Load Sensing Switch

DTC C1429 - Open or Short in Brake Pedal Load Sensing Switch

DESCRIPTION

The brake pedal load sensing switch is turned on when the brake pedal is depressed with force exceeding a predetermined level.
The skid control ECU detects if the brake pedal is depressed or not via this circuit.






WIRING DIAGRAM





INSPECTION PROCEDURE
NOTE: When replacing the brake actuator assembly, perform zero point calibration Programming and Relearning.
HINT: When C1425 and/or C1426 is output together with C1429, inspect and repair the trouble areas indicated by C1425 and/or C1426 first C1425, or C1426).

PROCEDURE

1. READ VALUE ON TECHSTREAM (BRAKE PEDAL LOAD SENSING SWITCH)
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch on (IG).
(c) Select the Data List mode on Techstream Data List / Active Test.

ABS / VSC / TRAC:





(d) Check that the brake pedal load sensing switch display observed on Techstream changes according to brake pedal operation.
OK:
The Techstream displays ON or OFF according to brake pedal operation.
NG -- INSPECT BRAKE PEDAL LOAD SENSING SWITCH
OK -- Continue to next step.
2. RECONFIRM DTC
(a) Turn the ignition switch off.
(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(c) Start the engine.
(d) Perform the road and braking test.
(e) Check if the same DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:






B -- REPLACE BRAKE ACTUATOR ASSEMBLY
A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)
3. INSPECT BRAKE PEDAL LOAD SENSING SWITCH




NOTICE:
- Do not remove the brake pedal load sensing switch from the brake pedal sub-assembly.
- When there is a malfunction in the brake pedal load sensing switch, replace the brake pedal sub-assembly.
(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.
(d) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE BRAKE PEDAL SUB-ASSEMBLY (BRAKE PEDAL LOAD SENSING SWITCH)
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