Toyota Corolla Cross: Electronic Brake Booster Motor "A" Temperature Sensor "A" Circuit Voltage Out of Range (C148A1C,...,C149A1C)

Toyota Corolla Cross (2022-2024) Service Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System (for Hev Model) / Electronic Brake Booster Motor "A" Temperature Sensor "A" Circuit Voltage Out of Range (C148A1C,...,C149A1C)

DESCRIPTION

Refer to DTC C11704B

Click here

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Note
C148A1C	Electronic Brake Booster Motor "A" Temperature Sensor "A" Circuit Voltage Out of Range	Temp sensor 1 output voltage is 3.27 V or more, or 0.2 V or less, for 0.6 seconds or more.	Electric brake booster (brake booster with master cylinder assembly)	Comes on	Brake Booster	SAE Code: C148B (Case 1 and 2) Output ECU: Electric brake booster (brake booster with master cylinder assembly)
C148F62	Electronic Brake Booster Motor Temperature "A" / "B" Signal Compare Failure	The sum of temp sensor 1 and temp sensor 2 output voltages is within the range of 3.17 V to 3.43 V for 0.6 seconds or more.	Electric brake booster (brake booster with master cylinder assembly)	Comes on	Brake Booster	SAE Code: C148F Output ECU: Electric brake booster (brake booster with master cylinder assembly)
C149A1C	Electronic Brake Booster Motor "A" Temperature Sensor "B" Circuit Voltage Out of Range	Temp sensor 2 output voltage is 3.27 V or more, or 0.2 V or less, for 0.6 seconds or more.	Electric brake booster (brake booster with master cylinder assembly)	Comes on	Brake Booster	SAE Code: C149B (Case 1 and 2) Output ECU: Electric brake booster (brake booster with master cylinder assembly)

MONITOR DESCRIPTION

C148B (Case 1):

2 temperature sensor systems that measure the temperature of the motor drive circuit are built into the electric brake booster (brake booster with master cylinder assembly).
When the electronically controlled brake system is operating or shutting down and the voltage value of the No. 1 temperature sensor exceeds a certain value, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.

C148B (Case 2):

2 temperature sensor systems that measure the temperature of the motor drive circuit are built into the electric brake booster (brake booster with master cylinder assembly).
When the electronically controlled brake system is operating or shutting down and the voltage value of the No. 1 temperature sensor is less than a certain value, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.

C148F:

There are 2 temperature sensor systems that measure the temperature of the motor drive circuit built into the electric brake booster (brake booster with master cylinder assembly). One has a positive coefficient characteristic (as the temperature increases, the output value increases) and the other has a negative coefficient characteristic (as the temperature increases, the output value decreases).
When the electronically controlled brake system is operating or shutting down and it is detected that the total voltage value of the No. 1 and No. 2 temperature sensor is outside of a certain range a certain number of times or more, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.

C149B (Case 1):

2 temperature sensor systems that measure the temperature of the motor drive circuit are built into the electric brake booster (brake booster with master cylinder assembly).
When the electronically controlled brake system is operating or shutting down and the voltage value of the No. 2 temperature sensor exceeds a certain value, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.

C149B (Case 2):

2 temperature sensor systems that measure the temperature of the motor drive circuit are built into the electric brake booster (brake booster with master cylinder assembly).
When the electronically controlled brake system is operating or shutting down and the voltage value of the No. 2 temperature sensor is less than a certain value, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs	C148B (Case 1): Temperature sensor line monitoring (ch1-high) C148B (Case 2): Temperature sensor line monitoring (ch1-low) C148F: Temperature sensor rationality monitoring (SUM monitoring) C149B (Case 1): Temperature sensor line monitoring (ch2-high) C149B (Case 2): Temperature sensor line monitoring (ch2-low)
Required Sensors/Components(Main)	Electric brake booster (brake booster with master cylinder assembly)
Required Sensors/Components(Related)	Electric brake booster (brake booster with master cylinder assembly)
Frequency of Operation	Continuous
Duration	0.6 seconds
MIL Operation	2 driving cycles
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored	TMC's intellectual property
Other conditions belong to TMC's intellectual property	-

TYPICAL MALFUNCTION THRESHOLDS

TMC's intellectual property

COMPONENT OPERATING RANGE

TMC's intellectual property

CONFIRMATION DRIVING PATTERN

NOTICE:

When performing the normal judgment procedure, make sure that the driver door is closed and is not opened at any time during the procedure.

HINT:

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off.
Turn the ignition switch to ON (READY) and turn the GTS on.
Wait for 1 second or more. [*]
HINT:

[*]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
Enter the following menus: Chassis / Brake Booster / Utility / All Readiness.
Check the DTC judgment result.
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE, perform driving pattern again.

PROCEDURE

1.	REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

Click here

END

SEE MORE:

Inverter Low-voltage Circuit

DESCRIPTION The cause of the malfunction may be the low-voltage circuit. Check whether there is an open circuit in the inverter +B low-voltage power source system or a problem in the communication between the hybrid vehicle control ECU and inverter. Related Parts Check Area Inspection

Data List / Active Test

DATA LIST / ACTIVE TEST DATA LIST NOTICE: In the following table, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. HINT: Using the GTS to read the Data List allows the values or states of

Toyota Corolla Cross: Electronic Brake Booster Motor "A" Temperature Sensor "A" Circuit Voltage Out of Range (C148A1C,...,C149A1C)

READ NEXT:

Multi-axis Acceleration Sensor Module "A" Supply Voltage Circuit Voltage Out of Range (C14D71C)

Left Front Wheel Speed Sensor Supply Voltage Circuit Short to Ground or Open (C14E014)

Right Front Wheel Speed Sensor Supply Voltage Circuit Short to Ground or Open (C14E314)

SEE MORE:

Inverter Low-voltage Circuit

Data List / Active Test