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".
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-
Before replacing the ECM, refer to Registration.
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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)
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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...
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Keys
To use the auxiliary key, press the knob and pull out the auxiliary key from the smart key.
