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.
This DTC is stored when the +BS terminal voltage deviates due to a malfunction in a power supply or charging system circuit such as the battery or alternator circuit, etc.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from | Priority |
|---|---|---|---|---|---|
| C137BA3 | Brake System Control Module "A" System Voltage System Voltage High | +BS terminal voltage is more than 16.5 V for 1 second or more. | ·
Wire harness or connector ·
Skid control ECU (brake actuator assembly) |
Brake/EPB | A |
Inspect the fuses for circuits related to this system before performing the following procedure.
Before performing troubleshooting, make sure to confirm that the battery voltage is normal.
Procedure1
Make sure that there is no looseness at the locking part and the connecting part of the connector.
The connector is securely connected.
Pre-procedure1
Disconnect the A40 skid control ECU (brake actuator assembly) connector.
Procedure2
Check both the connector case and the terminals for deformation and corrosion.
No deformation or corrosion.
Procedure3
Measure the voltage according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
|
Click Location & Routing(A40)Location & Routingewd_type=routing;type=c;code=A40 Click Connector(A40)Engine Compartment>Engine Room Main Wire / Transmission Wire>Brake Actuator Assemblyewd_type=component;type=c;code=A40;pinno=30 |
||
| A40-30 (+BS) - Body ground | Always | 11 to 14 V |
| Proceed to |
|---|
| OK |
| NG |
Post-procedure1
None
OK
NG