Toyota Yaris: Vehicle Stability Control System / ECM Communication (C124A00)
DESCRIPTION
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from |
|---|---|---|---|---|
| C124A00 | ECM Communication | Any of the following is detected:
|
| Brake |
CAUTION / NOTICE / HINT
NOTICE:
-
After replacing the skid control ECU (brake actuator assembly), perform "Calibration".
Click here
-
Before replacing the ECM, refer to Registration.
Click here
PROCEDURE
| 1. | CHECK PART NUMBER (ECM) |
(a) Check that the proper ECM is installed.
OK:
Proper ECM is installed.
(b) Check if the ECM was replaced before the DTC was stored.
OK:
ECM was not replaced
| Result | Proceed to |
|---|---|
| OK | A |
| NG (A proper ECM is not installed and/or the ECM was replaced) | B |
| B |
 | REPLACE ECM |
|
| 2. | CHECK PART NUMBER (BRAKE ACTUATOR ASSEMBLY) |
(a) Check that the proper brake actuator assembly is installed.
OK:
Proper brake actuator assembly is installed.
(b) Check if the brake actuator assembly was replaced before the DTC was recorded.
OK:
The brake actuator assembly was not replaced.
| Result | Proceed to |
|---|---|
| OK | A |
| NG (The brake actuator assembly was replaced) | B |
| NG (A proper brake actuator assembly is not installed) | C |
| B |
 | GO TO STEP 5 |
| C |
 | REPLACE BRAKE ACTUATOR ASSEMBLY |
|
| 3. | CLEAR DTC |
(a) Operate the GTS to clear the codes.
Chassis > Brake > Clear DTCs(b) Press the DTC clear button.
(c) Turn the ignition switch off.
|
| 4. | RECONFIRM DTC |
(a) Operate the GTS to read the DTCs.
Chassis > Brake > Trouble Codes(b) Check if the same DTC is output.
| Result | Proceed to |
|---|---|
| C124A00 is not output | A |
| C124A00 is output | B |
| A |
 | USE SIMULATION METHOD TO CHECK |
| B |
 | REPLACE BRAKE ACTUATOR ASSEMBLY |
| 5. | CHECK CALIBRATION |
(a) After replacing the skid control ECU (brake actuator assembly), check that "Calibration" is performed.
HINT:
If a new skid control ECU (brake actuator assembly) was installed, C121054 and C051D54 are output before "Calibration" is performed.
| Result | Proceed to |
|---|---|
| Calibration performed | A |
| Calibration not performed | B |
| A |
 | REPLACE BRAKE ACTUATOR ASSEMBLY |
| B |
 | PERFORM CALIBRATION |
Brake Master Cylinder Pressure Sensor Supply Voltage Circuit Short to Ground or Open (C122D14)
DESCRIPTION DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from C122D14 Brake Master Cylinder Pressure Sensor Supply Voltage Circuit Short to Ground or Open Master cylinder pressure sensor power supply voltage decrease occurs or history of voltage decrease exists, and defective master cylinder pressure sensor output continues for 1...
Brake System Control Module "A" System Voltage System Voltage Low (C137BA2)
DESCRIPTION If a malfunction is detected in the power supply circuit, the skid control ECU (brake actuator assembly) stores this DTC and the fail-safe function prohibits ABS operation...
Other information:
Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Removal
REMOVAL CAUTION / NOTICE / HINT HINT: Use the same procedure for the RH and LH sides. The procedure listed below is for the LH side. PROCEDURE 1. REMOVE FRONT DOOR LOWER FRAME BRACKET GARNISH Click here 2. REMOVE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY WITH FRONT ARMREST BASE UPPER PANEL (for Driver Side) Click here 3...
Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Check Mode Procedure
CHECK MODE PROCEDURE HINT: Compared to normal mode, check mode is more sensitive to malfunctions. Therefore, check mode can detect malfunctions that cannot be detected in normal mode. NOTICE: All the stored DTCs and freeze frame data are cleared if: 1) the engine stop and start ECU is switched from normal mode to check mode or vice versa; or 2) the ignition switch is turned from ON to ACC or off while in check mode...
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Keys
To use the auxiliary key, press the knob and pull out the auxiliary key from the smart key.
