| Last Modified: 05-08-2025 | 6.11:8.1.0 | Doc ID: RM10000000214Q4 |
| Model Year Start: 2022 | Model: RAV4 | Prod Date Range: [12/2021 - ] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C124A05; ECM Communication System Programming Failure; 2022 - 2025 MY RAV4 RAV4 HV [12/2021 - ] | ||
|
DTC |
C124A05 |
ECM Communication System Programming Failure |
DESCRIPTION
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Note |
|---|---|---|---|---|---|
|
C124A05 |
ECM Communication System Programming Failure |
When the vehicle speed is 40 km/h (25 mph) or more, one of the following conditions is met:
|
|
Comes on |
|
C124A05 DTC Detection Conditions
|
Vehicle Condition |
|||
|---|---|---|---|
|
Pattern 1 |
Pattern 2 |
||
|
Diagnosis Condition |
When the vehicle speed is 40 km/h (25 mph) or more |
○ |
○ |
|
Malfunction Status |
The engine type, powertrain variation and destination information sent from the hybrid vehicle control ECU do not match the information stored in the No. 2 skid control ECU (brake actuator assembly) |
○ |
- |
|
No system information stored in the No. 2 skid control ECU (brake actuator assembly) |
- |
○ |
|
|
Detection Time |
- |
- |
|
|
Number of Trips |
1 trip |
1 trip |
|
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
MONITOR DESCRIPTION
When one of the following conditions is met at a certain vehicle speed or more, the No. 2 skid control ECU (brake actuator assembly) judges that there is a learning malfunction, the MIL is illuminated and a DTC is stored.
- The engine type, powertrain variation and destination information sent from the hybrid vehicle control ECU do not match the information stored in the No. 2 skid control ECU (brake actuator assembly).
- No system information stored in the No. 2 skid control ECU (brake actuator assembly).
MONITOR STRATEGY
|
Related DTCs |
C124A: Identification signal |
|
Required Sensors/Components(Main) |
No. 2 skid control ECU (brake actuator assembly) Hybrid vehicle control ECU |
|
Required Sensors/Components(Related) |
Speed sensor No. 2 skid control ECU (brake actuator assembly) |
|
Frequency of Operation |
Continuous |
|
Duration |
- |
|
MIL Operation |
Immediately |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
|
Monitor runs whenever the following DTCs are not stored |
None |
|
All of the following conditions are met |
- |
|
EEPROM read-in |
Complete |
|
IG1 |
On |
|
Vehicle speed |
40 km/h (24.85 mph) or more |
TYPICAL MALFUNCTION THRESHOLDS
|
Either of the following conditions is met |
- |
|
Grade info |
Undetermined or different from a storage memory |
|
Car spec info |
There is no write-in |
|
Drive train info |
Undetermined or different from a storage memory |
|
Steering handle info |
There is no write-in |
COMPONENT OPERATING RANGE
|
All of the following conditions are met |
- |
|
EEPROM read-in |
Complete |
|
IG1 |
On |
|
Grade info |
Decision and concordance from a storage memory |
|
Car spec info |
There is write-in |
|
Drive train info |
Decision and concordance from a storage memory |
|
Steering handle info |
There is no write-in |
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.
-
Drive the vehicle at a speed of 40 km/h (25 mph) or more 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.
- Enter the following menus: Chassis / Brake/EPB / 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.
CAUTION / NOTICE / HINT
NOTICE:
After replacing the No. 2 skid control ECU (brake actuator assembly), perform "Calibration" after performing "Reset Memory".
Click here
![2022 - 2025 MY RAV4 RAV4 HV [12/2021 - ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): UTILITY](/t3Portal/stylegraphics/info.gif)
PROCEDURE
|
1. |
CHECK PART NUMBER (HYBRID VEHICLE CONTROL ECU) |
(a) Check that the proper hybrid vehicle control ECU is installed.
OK:
Proper hybrid vehicle control ECU is installed.
| NG |
|
REPLACE HYBRID VEHICLE CONTROL ECU
|
|
|
2. |
CHECK PART NUMBER (BRAKE ACTUATOR ASSEMBLY) |
(a) Check that the proper brake actuator assembly is installed.
OK:
Proper brake actuator assembly is installed.
| NG |
|
REPLACE BRAKE ACTUATOR ASSEMBLY
|
|
|
3. |
SYSTEM INFORMATION MEMORIZATION |
(a) Perform system information memorization.
Click here
Chassis > Brake/EPB > Utility
|
Tester Display |
|---|
|
Reset Memory |
Chassis > Brake/EPB > Utility
|
Tester Display |
|---|
|
Calibration |
HINT:
After performing "Reset Memory" using the GTS to clear the memorized value of the No. 2 skid control ECU (brake actuator assembly), DTC C124A05 will be stored until system information memorization is performed.
|
|
4. |
CLEAR DTC |
(a) Clear the DTCs.
Chassis > Brake/EPB > Clear DTCs
(b) Turn the ignition switch off.
|
|
5. |
RECONFIRM DTC |
(a) Based on the Freeze Frame Data and interview with the customer, attempt to reproduce the conditions when the malfunction occurred.
(b) Check if the same DTC is output.
Chassis > Brake/EPB > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
DTC C124A05 is not output. |
A |
|
DTC C124A05 is output. |
B |
| A |
|
END |
| B |
|
REPLACE BRAKE ACTUATOR ASSEMBLY
|
|
|