The motor actuator is built into the brake booster with master cylinder assembly.
The electric brake booster (brake booster with master cylinder assembly) drives the motor in accordance with the operation angle of the brake pedal by the driver to assist the brake pedal force of the driver.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | DTC Output from | Note |
|---|---|---|---|---|---|---|
| C12B400 | Electronic Brake Booster Motor "A" | Abnormality in motor actuator rotation is detected for 0.3 seconds or more. | Electric brake booster (brake booster with master cylinder assembly) | Comes on | Brake Booster | ·
SAE Code: C12B4 (Case 3) ·
Output ECU: Electric brake booster (brake booster with master cylinder assembly) |
| C12B41C | Electronic Brake Booster Motor "A" Circuit Voltage Out of Range | Poor internal condition of motor actuator is detected. | Electric brake booster (brake booster with master cylinder assembly) | Comes on | Brake Booster | ·
SAE Code: C12B4 (Case 4) ·
Output ECU: Electric brake booster (brake booster with master cylinder assembly) |
| C12B41E | Electronic Brake Booster Motor "A" Circuit Resistance Out of Range | Internal failure in motor actuator is detected for 0.12 seconds. | Electric brake booster (brake booster with master cylinder assembly) | Does not come on | Brake Booster | Output ECU: Electric brake booster (brake booster with master cylinder assembly) |
| C12B477 | Electronic Brake Booster Motor "A" Commanded Position Not Reachable | Abnormality in motor actuator rotation is detected for 0.3 seconds or more. | Electric brake booster (brake booster with master cylinder assembly) | Comes on | Brake Booster | ·
SAE Code: C12B4 (Case 2) ·
Output ECU: Electric brake booster (brake booster with master cylinder assembly) |
| C12B496 | Electronic Brake Booster Motor "A" Component Internal Failure | Detected that the motor actuator cannot be driven. | Electric brake booster (brake booster with master cylinder assembly) | Comes on | Brake Booster | ·
SAE Code: C12B4 (Case 1) ·
Output ECU: Electric brake booster (brake booster with master cylinder assembly) |
| C12B579 | Electronic Brake Booster Motor "A" Mechanical Linkage Failure | Abnormality in motor actuator rotation is detected. | Electric brake booster (brake booster with master cylinder assembly) | Comes on | Brake Booster | ·
SAE Code: C12B5 (Case 1 and 2) ·
Output ECU: Electric brake booster (brake booster with master cylinder assembly) |
When performing the normal judgment procedure, make sure that the driver door is closed and is not opened at any time during the procedure.
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. [*]
[*]: 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.
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.
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