Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM1000000025DUH |
Model Year Start: 2023 |
Model: Corolla |
Prod Date Range: [09/2022 -
] |
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for HV Model): C117A49,C137BA2; Brake System Control Module "A" System Voltage Line Internal Electronic Failure; 2023 - 2025 MY Corolla Corolla HV [09/2022 - ] |
DTC
|
C117A49
|
Brake System Control Module "A" System Voltage Line Internal Electronic Failure
|
DTC
|
C137BA2
|
Brake System Control Module "A" System Voltage System Voltage Low
|
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, brake assist, regenerative braking, etc. operation.
This DTC is stored when the +BS terminal voltage meets one of the DTC detection conditions due to a malfunction in the power supply or charging circuit such as the auxiliary battery or DC/DC converter circuit, etc.
The DTC is cleared when the +BS terminal voltage returns to normal.
DTC No.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
MIL
|
DTC Output from
|
Note
|
C117A49
|
Brake System Control Module "A" System Voltage Line Internal Electronic Failure
|
The vehicle speed is 15 km/h (9 mph) or more and the +BS terminal voltage is 9.6 V or more, the skid control ECU (brake actuator assembly) turns on more than one valve at the same time within a short period of time and the valve relay supply voltage drop exceeds the threshold.*
|
-
Wire harness or connector
-
Skid control ECU (brake actuator assembly)
|
Comes on
|
Brake/EPB
|
-
SAE Code: C117A
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Output ECU: Skid control ECU (brake actuator assembly)
|
C137BA2
|
Brake System Control Module "A" System Voltage System Voltage Low
|
Any of the following is detected:
-
The vehicle speed is 6 km/h (4 mph) or more and the +BS terminal voltage (soft low voltage) is less than 9.6 V for 1 second or more.
-
The vehicle speed is 6 km/h (4 mph) or more and the +BS terminal voltage (hard low voltage) is less than 6.9 V for 1 second or more.
-
The +BS terminal voltage is less than 6.7 V and the skid control ECU (brake actuator assembly) judges that power supply voltage is abnormal for 0.06 seconds or more.
-
When the system has started, the +BS terminal voltage is less than 5 V for 0.5 seconds or more.
-
The +BS terminal voltage is less than 2.6 V for 0.2 seconds or more.
|
-
Wire harness or connector
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Skid control ECU (brake actuator assembly)
|
Does not come on
|
Brake/EPB
|
Output ECU: Skid control ECU (brake actuator assembly)
|
*: The skid control ECU (brake actuator assembly) monitors the resistance of the power source line at the +BS terminal. A malfunction is detected when an abnormality occurs in the +BS terminal wire harness or its connection and the skid control ECU (brake actuator assembly) determines that the wiring resistance at the +BS terminal exceeds the standard resistance.
MONITOR DESCRIPTION
When the vehicle speed is more than a certain value, the supply voltage of the skid control ECU (brake actuator assembly) is a certain value or more, the brake pedal is not depressed, and the resistance of the solenoid supply voltage line exceeds a certain value a certain number of times, the skid control ECU (brake actuator assembly) illuminates the MIL and stores this DTC.
MONITOR STRATEGY
Related DTCs
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C117A: Supply voltage line test
|
Required Sensors/Components(Main)
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Skid control ECU (brake actuator assembly)
|
Required Sensors/Components(Related)
|
Speed sensor
Skid control ECU (brake actuator assembly)
Stop light switch assembly
|
Frequency of Operation
|
During initial checking
|
Duration
|
-
|
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.
-
Drive the vehicle at 15 km/h (9 mph) or more for 1 second. [*]
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.
*: Electric Parking Brake System
-
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.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
Inspect the fuses for circuits related to this system before performing the following procedure.
-
Before performing troubleshooting, make sure to confirm that the auxiliary battery voltage is normal.
Click here
PROCEDURE
1.
|
CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)
|
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
|
|
*a
|
Front view of wire harness connector
(to skid control ECU (Brake Actuator Assembly))
|
|
|
(b) Disconnect the A51 skid control ECU (brake actuator assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
A51-30 (+BS) - Body ground
|
Always
|
11 to 14 V
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
2.
|
CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)
|
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
|
|
*a
|
Front view of wire harness connector
(to skid control ECU (Brake Actuator Assembly))
|
|
|
(b) Disconnect the A51 skid control ECU (brake actuator assembly) connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
A51-1 (+BM) - Body ground
|
Always
|
11 to 14 V
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|