DTC C14B3: Reaction Force Pressure Sensor Zero Point Malfunction [10/2018 - ]: Procedure

1. Check that the brake pedal and the brake pedal stroke sensor assembly are properly installed and that the pedal can be depressed normally.
2. Check and adjust the brake pedal height.

   Refer to PROCEDURE - Step 1

3. Adjust the brake pedal stroke sensor assembly.

   Refer to PROCEDURE - Step 4

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Select the Data List on the Techstream.

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

   Chassis > ABS/VSC/TRAC > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Reaction Force Pressure	Pressure value of stroke simulator	Min.: 0.00 MPa, Max.: 24.48 MPa	Brake pedal released: 0.00 MPa	Brake pedal is being depressed: Changes in proportion to the depression force of the brake pedal

   Chassis > ABS/VSC/TRAC > Data List 

   Tester Display
   Reaction Force Pressure

2. Check that the reaction force pressure sensor output value is within 0.00 to 1.53 MPa when the brake pedal is not depressed.

   OK

   The reaction force pressure sensor output value is within 0.00 to 1.53 MPa.

   HINT: 

   If the reaction force pressure sensor output value is within 0.00 to 1.53 MPa, the skid control ECU (brake booster with master cylinder assembly) automatically performs zero point calibration every time the power switch is turned on (IG).

   Therefore, if the reaction force pressure sensor output value is not within 0.00 to 1.53 MPa, replace the skid control ECU (brake booster with master cylinder assembly) with a new one.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [10/2018 - 07/2022]  , or refer to  REMOVAL [07/2022 - ] 

Result: 

OK 

See step  3

1. Clear the DTCs.

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

   Chassis > ABS/VSC/TRAC > Clear DTCs 

2. Turn the power switch off.
3. Turn the power switch on (IG).
4. Check if the same DTC is output.

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

   Chassis > ABS/VSC/TRAC > Trouble Codes 

   HINT: 

   Even if the DTC is cleared, it will immediately be output again if the reaction force pressure sensor zero point malfunction remains.

   Result

   Result	Proceed to
   DTC C14B3 is not output.	A
   DTC C14B3 is output.	B

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - ] 

Result: 

B 

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY. Refer to  REMOVAL [10/2018 - 07/2022]  , or refer to  REMOVAL [07/2022 - ]