BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): C14B0,...,C14D4; Reaction Force Pressure Sensor Power Supply Voltage Malfunction; 2020 - 2022 MY Corolla Corolla HV [01/2019

Last Modified: 07-31-2024	6.11:8.1.0	Doc ID: RM100000001G7AI
Model Year Start: 2020	Model: Corolla	Prod Date Range: [01/2019 - 09/2022]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): C14B0,...,C14D4; Reaction Force Pressure Sensor Power Supply Voltage Malfunction; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

DTC

C14B0

Reaction Force Pressure Sensor Power Supply Voltage Malfunction

DTC

C14B1

Reaction Force Pressure Sensor Communication Malfunction

DTC

C14B2

Reaction Force Pressure Sensor Internal Malfunction

DTC

C14B4

Reaction Force Pressure Sensor Output Malfunction

DTC

C14B5

Reaction Force Pressure Sensor Data Invalid

DTC

C14C0

Servo Pressure Sensor Power Supply Voltage Malfunction

DTC

C14C1

Servo Pressure Sensor Communication Malfunction

DTC

C14C2

Servo Pressure Sensor Internal Malfunction

DTC

C14C4

Servo Pressure Sensor Output Malfunction

DTC

C14C5

Servo Pressure Sensor Data Invalid

DTC

C14D0

Accumulator Pressure Sensor Power Supply Voltage Malfunction

DTC

C14D1

Accumulator Pressure Sensor Communication Malfunction

DTC

C14D2

Accumulator Pressure Sensor Internal Malfunction

DTC

C14D3

Accumulator Pressure Sensor Output Malfunction

DTC

C14D4

Accumulator Pressure Sensor Data Invalid

DESCRIPTION

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	MIL	Note
C14B0	Reaction Force Pressure Sensor Power Supply Voltage Malfunction	201	The supplied voltage to the sensor is less than 6.3 V or 7.7 V or more for 0.05 seconds or more.	Skid control ECU (brake booster with master cylinder assembly)	Comes on	INF Code 201: SAE Code C14B0 Electronically controlled brake system DTC
C14B1	Reaction Force Pressure Sensor Communication Malfunction	202	Communication with the sensor is invalid for 0.05 seconds or more.	Skid control ECU (brake booster with master cylinder assembly)	Comes on	INF Code 202: SAE Code C14B1 Electronically controlled brake system DTC
C14B2	Reaction Force Pressure Sensor Internal Malfunction	203	A malfunction is detected by self-diagnosis function of the sensor.	Skid control ECU (brake booster with master cylinder assembly)	Comes on	INF Code 203: SAE Code C14B2 Electronically controlled brake system DTC
C14B4	Reaction Force Pressure Sensor Output Malfunction	207	Fluctuation of the sensor signal exceeds the threshold (7.5 MPa (76.5 kgf/cm², 1088 psi) or more from the previous value) for 0.1 seconds or more.	Skid control ECU (brake booster with master cylinder assembly)	Comes on	INF Code 207: SAE Code C14B4 Electronically controlled brake system DTC
C14B5	Reaction Force Pressure Sensor Data Invalid	208	Data from the sensor is invalid for 0.2 seconds or more.	Skid control ECU (brake booster with master cylinder assembly)	Comes on	INF Code 208: SAE Code C14B5 Electronically controlled brake system DTC
C14C0	Servo Pressure Sensor Power Supply Voltage Malfunction	421	The supplied voltage to the sensor is less than 6.3 V or 7.7 V or more for 0.05 seconds or more.	Skid control ECU (brake booster with master cylinder assembly)	Comes on	INF Code 421: SAE Code C14C0 Electronically controlled brake system DTC
C14C1	Servo Pressure Sensor Communication Malfunction	422	Communication with the sensor is invalid for 0.05 seconds or more.	Skid control ECU (brake booster with master cylinder assembly)	Comes on	INF Code 422: SAE Code C14C1 Electronically controlled brake system DTC
C14C2	Servo Pressure Sensor Internal Malfunction	423	A malfunction is detected by self-diagnosis function of the sensor.	Skid control ECU (brake booster with master cylinder assembly)	Comes on	INF Code 423: SAE Code C14C2 Electronically controlled brake system DTC
C14C4	Servo Pressure Sensor Output Malfunction	426	Fluctuation of the sensor signal exceeds the threshold (7.5 MPa (76.5 kgf/cm², 1088 psi) or more from the previous value) for 0.1 seconds or more.	Skid control ECU (brake booster with master cylinder assembly)	Comes on	INF Code 426: SAE Code C14C4 Electronically controlled brake system DTC
C14C5	Servo Pressure Sensor Data Invalid	427	Data from the sensor is invalid for 0.2 seconds or more.	Skid control ECU (brake booster with master cylinder assembly)	Comes on	INF Code 427: SAE Code C14C5 Electronically controlled brake system DTC
C14D0	Accumulator Pressure Sensor Power Supply Voltage Malfunction	331	The supplied voltage to the sensor is less than 6.3 V or 7.7 V or more for 0.05 seconds or more.	Skid control ECU (brake booster with master cylinder assembly)	Comes on	INF Code 331: SAE Code C14D0 Electronically controlled brake system DTC
C14D1	Accumulator Pressure Sensor Communication Malfunction	332	Communication with the sensor is invalid for 0.2 seconds or more.	Skid control ECU (brake booster with master cylinder assembly)	Comes on	INF Code 332: SAE Code C14D1 Electronically controlled brake system DTC
C14D2	Accumulator Pressure Sensor Internal Malfunction	335	A malfunction is detected by self-diagnosis function of the sensor.	Skid control ECU (brake booster with master cylinder assembly)	Comes on	INF Code 335: SAE Code C14D2 Electronically controlled brake system DTC
C14D3	Accumulator Pressure Sensor Output Malfunction	333	Fluctuation of the sensor signal exceeds the threshold (7.5 MPa (76.5 kgf/cm², 1088 psi) or more from the previous value) for 0.1 seconds or more.	Skid control ECU (brake booster with master cylinder assembly)	Comes on	INF Code 333: SAE Code C14D3 Electronically controlled brake system DTC
C14D4	Accumulator Pressure Sensor Data Invalid	336 337	INF Code: 336 Data from the sensor is invalid for 0.8 seconds or more. INF Code: 337 ECU internal malfunction. (A sensor malfunction is detected by the internal IC.)	Skid control ECU (brake booster with master cylinder assembly)	Comes on	INF Code 336: SAE Code C14D4 (Case 1) INF Code 337: SAE Code C14D4 (Case 2) Electronically controlled brake system DTC

MONITOR DESCRIPTION

C14B0, C14C0 and C14D0:

When the supply voltage to a brake fluid pressure sensor is outside of the normal range, the skid control ECU (brake booster with master cylinder assembly) judges that the supply voltage to the sensor is abnormal and illuminates the MIL and stores a DTC.

C14B1, C14C1 and C14D1:

When an invalid serial communication signal is detected, the skid control ECU (brake booster with master cylinder assembly) judges that communication is abnormal and illuminates the MIL and stores a DTC.

C14B2, C14C2 and C14D2:

When the pressure or temperature of a brake fluid pressure sensor exceeds a certain value, the skid control ECU (brake booster with master cylinder assembly) judges that the internal data is abnormal and illuminates the MIL and stores a DTC.

C14B4, C14C4 and C14D3:

When the difference between the present output of a brake fluid pressure sensor and the previous output of a brake fluid pressure sensor becomes considerably large, the skid control ECU (brake booster with master cylinder assembly) judges that the sensor output is abnormal and illuminates the MIL and stores a DTC.

C14B5, C14C5 and C14D4 (Case 1):

When the following conditions are met, the skid control ECU (brake booster with master cylinder assembly) judges that the data from a brake fluid pressure sensor is invalid and illuminates the MIL and stores a DTC.
1. Brake fluid pressure sensor related DTCs (DTC C14B0, C14B1, C14B2, C14B4, C14C0, C14C1, C14C2, C14C4, C14D0, C14D1, C14D2 and C14D3) are not stored.
2. When related malfunction DTCs are not stored, the skid control ECU (brake booster with master cylinder assembly) detects a brake fluid pressure sensor malfunction.

C14D4 (Case 2):

When the accumulator pressure sensor data is abnormal or there is a communication error, before the accumulator pressure sensor is judged to be malfunctioning (C14D0, C14D1 or C14D2), a reset of the timer which is used for detection timing, etc., may be performed by the IC. If this situation repeats consecutively, the skid control ECU (brake booster with master cylinder assembly) judges that the accumulator pressure sensor reset is abnormal and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs	C14B0: Reaction force pressure sensor voltage circuit check C14B1: Reaction force pressure sensor lost communication C14B2: Reaction force pressure sensor internal malfunction C14B4: Reaction force pressure sensor intermittent/erratic C14B5: Reaction force pressure sensor invalid data C14C0: Servo pressure sensor voltage circuit check C14C1: Servo pressure sensor lost communication C14C2: Servo pressure sensor internal malfunction C14C4: Servo pressure sensor intermittent/erratic C14C5: Servo pressure sensor invalid data C14D0: Accumulator pressure sensor voltage circuit check C14D1: Accumulator pressure sensor lost communication C14D2: Accumulator pressure sensor internal malfunction C14D3: Accumulator pressure sensor intermittent/erratic C14D4 (Case 1): Accumulator pressure sensor invalid data C14D4 (Case 2): Accumulator pressure sensor intermittent
Required Sensors/Components(Main)	Skid control ECU (brake booster with master cylinder assembly) Brake actuator (brake booster with master cylinder assembly)
Required Sensors/Components(Related)	Skid control ECU (brake booster with master cylinder assembly) Brake actuator (brake booster with master cylinder assembly)
Frequency of Operation	Continuous
Duration	Within 1 second: C14B0, C14B1, C14B2, C14B4, C14B5, C14C0, C14C1, C14C2, C14C4, C14C5, C14D0, C14D1, C14D2, C14D3 and C14D4 (Case 1) 2 times: C14D4 (Case 2)
MIL Operation	Immediately
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

C14B0

Monitor runs whenever the following DTCs are not stored	None
Brake system voltage 1 (VM1)	Higher than 8.27 V

C14B1

Monitor runs whenever the following DTCs are not stored	None
Power supply for reaction force pressure sensor	6.3 V or more, and 7.64 V or less

C14B2 and C14B4

Monitor runs whenever the following DTCs are not stored	None
Both of the following conditions are met	-
Lost communication with reaction force pressure sensor	Not detected
Power supply for reaction force pressure sensor	6.3 V or more, and 7.64 V or less

C14B5

Monitor runs whenever the following DTCs are not stored	C14B0 (Reaction force pressure sensor voltage circuit check) C14B1 (Reaction force pressure sensor lost communication) C14B2 (Reaction force pressure sensor internal malfunction) C14B4 (Reaction force pressure sensor intermittent/erratic)
All of the following conditions are met	-
Brake system voltage 1 (VM1)	Higher than 8.27 V
Serial communication with high side IC	Valid
Reaction force pressure sensor fail (C14B0, C14B1, C14B2, C14B4)	Not detected

C14C0

Monitor runs whenever the following DTCs are not stored	None
Brake system voltage 1 (VM1)	Higher than 8.27 V

C14C1

Monitor runs whenever the following DTCs are not stored	None
Power supply for servo pressure sensor	6.3 V or more, and 7.64 V or less

C14C2 and C14C4

Monitor runs whenever the following DTCs are not stored	None
Both of the following conditions are met	-
Lost communication with servo pressure sensor	Not detected
Power supply for servo pressure sensor	6.3 V or more, and 7.64 V or less

C14C5

Monitor runs whenever the following DTCs are not stored	C14C0 (Servo pressure sensor voltage circuit check) C14C1 (Servo pressure sensor lost communication) C14C2 (Servo pressure sensor internal malfunction) C14C4 (Servo pressure sensor intermittent/erratic)
All of the following conditions are met	-
Brake system voltage 1 (VM1)	Higher than 8.27 V
Serial communication with high side IC	Valid
Servo pressure sensor fail (C14C0, C14C1, C14C2, C14C4)	Not detected

C14D0

Monitor runs whenever the following DTCs are not stored	C14D4 (Case 2) (Accumulator pressure sensor intermittent)
Both of the following conditions are met	-
Brake system voltage 2 (VM2)	Higher than 8.27 V
Accumulator pressure sensor fail (C14D4 (Case 2))	Not detected

C14D1

Monitor runs whenever the following DTCs are not stored	C14D4 (Case 2) (Accumulator pressure sensor intermittent)
Both of the following conditions are met	-
Power supply for accumulator pressure sensor	6.29 V or more, and 7.64 V or less
Accumulator pressure sensor fail (C14D4 (Case 2))	Not detected

C14D2

Monitor runs whenever the following DTCs are not stored	C14D4 (Case 2) (Accumulator pressure sensor intermittent)
All of the following conditions are met	-
Lost communication with accumulator pressure sensor	Not detected
Power supply for accumulator pressure sensor	6.29 V or more, and 7.64 V or less
Accumulator pressure sensor fail (C14D4 (Case 2))	Not detected

C14D3

Monitor runs whenever the following DTCs are not stored	None
Both of the following conditions are met	-
Lost communication with accumulator pressure sensor	Not detected
Power supply for accumulator pressure sensor	6.29 V or more, and 7.64 V or less

C14D4 (Case 1)

Monitor runs whenever the following DTCs are not stored	C14D0 (Accumulator pressure sensor voltage circuit check) C14D1 (Accumulator pressure sensor lost communication) C14D2 (Accumulator pressure sensor internal malfunction) C14D3 (Accumulator pressure sensor intermittent/erratic) C14D4 (Case 2) (Accumulator pressure sensor intermittent)
Both of the following conditions are met	-
Brake system voltage 2 (VM2)	Higher than 8.27 V
Accumulator pressure sensor fail (C14D0, C14D1, C14D2, C14D3, C14D4 (Case 2))	Not detected

C14D4 (Case 2)

Monitor runs whenever the following DTCs are not stored	C14D0 (Accumulator pressure sensor voltage circuit check) C14D1 (Accumulator pressure sensor lost communication) C14D2 (Accumulator pressure sensor internal malfunction)
Both of the following conditions are met	-
Serial communication with low side IC	Valid
Accumulator pressure sensor fail (C14D0, C14D1, C14D2)	Not detected

TYPICAL MALFUNCTION THRESHOLDS

C14B0

Power supply for reaction force pressure sensor

Less than 6.3 V, or higher than 7.64 V

C14B1

Lost communication with reaction force pressure sensor

Detected

C14B2

Either of the following conditions is met	-
Reaction force pressure sensor value	Higher than 23.328 MPa (237.9 kgf/cm², 3384 psi)
Reaction force pressure temp sensor value	Higher than 150°C (302°F)

C14B4

Difference between present reaction force pressure and previous reaction force pressure

Higher than 7.5 MPa (76.5 kgf/cm², 1088 psi)

C14B5

Reaction force pressure sensor data

Invalid

C14C0

Power supply for servo pressure sensor

Less than 6.3 V, or higher than 7.64 V

C14C1

Lost communication with servo pressure sensor

Detected

C14C2

Either of the following conditions is met	-
Servo pressure sensor value	Higher than 23.328 MPa (237.9 kgf/cm², 3384 psi)
Servo pressure temp sensor value	Higher than 150°C (302°F)

C14C4

Difference between present servo pressure and previous servo pressure

Higher than 7.5 MPa (76.5 kgf/cm², 1088 psi)

C14C5

Servo pressure sensor data

Invalid

C14D0

Power supply for accumulator pressure sensor

Less than 6.29 V, or higher than 7.64 V

C14D1

Lost communication with accumulator pressure sensor

Detected

C14D2

Either of the following conditions is met	-
Accumulator pressure sensor value	Higher than 23.328 MPa (237.9 kgf/cm², 3384 psi)
Accumulator pressure temp sensor value	Higher than 150°C (302°F)

C14D3

Difference between present accumulator pressure and previous accumulator pressure

Higher than 7.5 MPa (76.5 kgf/cm², 1088 psi)

C14D4 (Case 1)

Accumulator pressure sensor data

Invalid

C14D4 (Case 2)

Accumulator pressure sensor IC is reset within less than 0.102 seconds

Met

COMPONENT OPERATING RANGE

C14B0

Both of the following conditions are met	-
Brake system voltage 1 (VM1)	Higher than 8.27 V
Power supply for reaction force pressure sensor	6.3 V or more, and 7.64 V or less

C14B1

Both of the following conditions are met	-
Power supply for reaction force pressure sensor	6.3 V or more, and 7.64 V or less
Lost communication with reaction force pressure sensor	Not detected

C14B2

All of the following conditions are met	-
Lost communication with reaction force pressure sensor	Not detected
Power supply for reaction force pressure sensor	6.3 V or more, and 7.64 V or less
Reaction force pressure sensor value	23.328 MPa (237.9 kgf/cm², 3384 psi) or less
Reaction force pressure temp sensor value	150°C (302°F) or less

C14B4

All of the following conditions are met	-
Lost communication with reaction force pressure sensor	Not detected
Power supply for reaction force pressure sensor	6.3 V or more, and 7.64 V or less
Difference between present reaction force pressure and previous reaction force pressure	7.5 MPa (76.5 kgf/cm², 1088 psi) or less

C14B5

Both of the following conditions are met	-
Brake system voltage 1 (VM1)	Higher than 8.27 V
Reaction force pressure sensor data	Valid

C14C0

Both of the following conditions are met	-
Brake system voltage 1 (VM1)	Higher than 8.27 V
Power supply for servo pressure sensor	6.3 V or more, and 7.64 V or less

C14C1

Both of the following conditions are met	-
Power supply for servo pressure sensor	6.3 V or more, and 7.64 V or less
Lost communication with servo pressure sensor	Not detected

C14C2

All of the following conditions are met	-
Lost communication with servo pressure sensor	Not detected
Power supply for servo pressure sensor	6.3 V or more, and 7.64 V or less
Servo pressure sensor value	23.328 MPa (237.9 kgf/cm², 3384 psi) or less
Servo pressure temp sensor value	150°C (302°F) or less

C14C4

All of the following conditions are met	-
Lost communication with servo pressure sensor	Not detected
Power supply for servo pressure sensor	6.3 V or more, and 7.64 V or less
Difference between present servo pressure and previous servo pressure	7.5 MPa (76.5 kgf/cm², 1088 psi) or less

C14C5

Both of the following conditions are met	-
Brake system voltage 1 (VM1)	Higher than 8.27 V
Servo pressure sensor data	Valid

C14D0

All of the following conditions are met	-
Brake system voltage 2 (VM2)	Higher than 8.27 V
Accumulator pressure sensor fail (C14D4 (Case 2))	Not detected
Power supply for accumulator pressure sensor	6.29 V or more, and 7.64 V or less

C14D1

Both of the following conditions are met	-
Power supply for accumulator pressure sensor	6.29 V or more, and 7.64 V or less
Lost communication with accumulator pressure sensor	Not detected

C14D2

All of the following conditions are met	-
Lost communication with accumulator pressure sensor	Not detected
Power supply for accumulator pressure sensor	6.29 V or more, and 7.64 V or less
Accumulator pressure sensor fail (C14D4 (Case 2))	Not detected
Accumulator pressure sensor value	23.328 MPa (237.9 kgf/cm², 3384 psi) or less
Accumulator pressure temp sensor value	150°C (302°F) or less

C14D3

All of the following conditions are met	-
Lost communication with accumulator pressure sensor	Not detected
Power supply for accumulator pressure sensor	6.29 V or more, and 7.64 V or less
Difference between present accumulator pressure and previous accumulator pressure	7.5 MPa (76.5 kgf/cm², 1088 psi) or less

C14D4 (Case 1)

Both of the following conditions are met	-
Brake system voltage 2 (VM2)	Higher than 8.27 V
Accumulator pressure sensor data	Valid

C14D4 (Case 2)

All of the following conditions are met	-
Serial communication with low side IC	Valid
The order that prohibit pump motor operating from IC	Off
Accumulator pressure sensor IC reset	Does not occur

CONFIRMATION DRIVING PATTERN

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off.
Turn the power switch on (IG).
Turn the Techstream on.
Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.
Read the DTCs.
HINT:
- If a DTC is output, the system is malfunctioning.
- If a DTC is not output, perform the following procedure.
If the DTCs are not output, perform a universal trip and check for permanent DTCs.
Click here
HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTCs are output, the system is normal.

CAUTION / NOTICE / HINT

NOTICE:

After replacing the skid control ECU (brake booster with master cylinder assembly), perform linear solenoid valve offset learning, ABS holding solenoid valve learning, yaw rate and acceleration sensor zero point calibration and system information memorization after performing "Reset Memory".

Click here

PROCEDURE

CHECK DTC

(a) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC > Clear DTCs

(b) Turn the power switch off.

(d) Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTCs C14B0, C14B1, C14B2, C14B4, C14B5, C14C0, C14C1, C14C2, C14C4, C14C5, C14D0, C14D1, C14D2, C14D3 and/or C14D4 are output.	A
DTCs C14B0, C14B1, C14B2, C14B4, C14B5, C14C0, C14C1, C14C2, C14C4, C14C5, C14D0, C14D1, C14D2, C14D3 and C14D4 are not output.	B

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

USE SIMULATION METHOD TO CHECK