Toyota Corolla Cross Owners & Service Manuals

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.
  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON and turn the GTS on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the ignition switch off.
  5. Turn the ignition switch to ON (READY) and turn the GTS on.
  6. 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.

  7. Enter the following menus: Chassis / Brake Booster / Utility / All Readiness.
  8. 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

NEXT

END

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