Toyota Corolla Cross: Electronic Brake Booster Motor "A" Drive Circuit Internal Electronic Failure (C12BF49,...,C12BF9E)
DESCRIPTION
The motor relay is built into the brake booster with master cylinder assembly.
The electric brake booster (brake booster with master cylinder assembly) turns the motor relay on to operate the motor in the brake booster with master cylinder assembly in accordance with the operation angle of the brake pedal by the driver.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
DTC Output from |
Note |
|---|---|---|---|---|---|---|
|
C12BF49 |
Electronic Brake Booster Motor "A" Drive Circuit Internal Electronic Failure |
Motor relay drive circuit abnormality detected. |
Electric brake booster (brake booster with master cylinder assembly) |
Comes on |
Brake Booster |
|
|
C12BF87 |
Electronic Brake Booster Motor "A" Drive Circuit Missing Message |
Motor relay drive circuit abnormality detected. |
Electric brake booster (brake booster with master cylinder assembly) |
Comes on |
Brake Booster |
|
|
C12BF96 |
Electronic Brake Booster Motor "A" Drive Circuit Component Internal Failure |
Motor relay internal abnormality detected. |
Electric brake booster (brake booster with master cylinder assembly) |
Comes on |
Brake Booster |
|
|
C12BF9E |
Electronic Brake Booster Motor "A" Drive Circuit Stuck On |
Motor relay drive circuit low voltage detected. |
Electric brake booster (brake booster with master cylinder assembly) |
Comes on |
Brake Booster |
|
MONITOR DESCRIPTION
C12BF (Case 1, 2 and 6):- When the electronically controlled brake system is starting and a motor drive circuit malfunction is detected, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
- When the electronically controlled brake system is operating or shutting down and a motor drive circuit internal malfunction is detected, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
- When the electronically controlled brake system is starting, operating or shutting down, and the MOSFET voltage of the motor drive circuit is outside of a certain range, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
- When the electronically controlled brake system is starting or DTC conditions are met, the self-diagnosis function performs a motor test. If the motor test does not complete within a certain amount of time, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
- When the electronically controlled brake system is starting, operating or shutting down, and a motor drive circuit malfunction is detected, the electric brake booster (brake booster with master cylinder assembly) illuminates the MIL and stores this DTC.
MONITOR STRATEGY
|
Related DTCs |
C12BF (Case 1): Motor drive circuit start up test C12BF (Case 2): Motor drive circuit unsupported configuration monitor C12BF (Case 3): Motor drive circuit internal failure monitor C12BF (Case 4): Motor drive circuit FET monitor C12BF (Case 5): Motor drive circuit unavailable C12BF (Case 6): Motor drive circuit FET failure detection circuit test C12BF (Case 7): Motor drive circuit phase short circuit test and monitor C12BF (Case 8): Motor drive circuit initial test timeout monitor C12BF (Case 9): Motor drive circuit serial peripheral interface communication monitor |
|
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 |
During initial checking |
|
Duration |
-: C12BF (Case 1, 3, 4, 6) 0.01 seconds: C12BF (Case 2 and 9) 0.03 seconds: C12BF (Case 7) 0.1 seconds: C12BF (Case 5) 0.505 seconds: C12BF (Case 8) |
|
MIL Operation |
Immediately |
|
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.
- Depress the brake pedal several times to operate the motor of the brake booster with master cylinder assembly.[*1]
- Wait for 1 second or more. [*2]
HINT:
[*1] to [*2]: 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 |
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|
END |
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Right Rear Wheel ABS Hold Solenoid Control Circuit Short to Battery (C12E712,...,C12F249)
DESCRIPTION
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DESCRIPTION
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SEE MORE:
Removal
REMOVAL CAUTION / NOTICE / HINT COMPONENTS (REMOVAL)
Procedure Part Name Code
1 FRONT SEAT ASSEMBLY
- -
- -
2 FRONT SEAT FRONT CUSHION SHIELD
71868N -
- -
3 FRONT SEAT CUSHION SHIELD
71812D
Precaution
PRECAUTION PRECAUTIONS FOR INSPECTING HYBRID SYSTEM
CAUTION:
Before the following operations are conducted, take precautions to prevent electric shock by turning the ignition switch off, wearing insulated gloves, and removing the service plug grip from HV battery.
To prevent electr
