If the voltage of any HV battery cell exceeds the threshold, charging will be prohibited. If charging cannot be prohibited due to a hybrid battery system malfunction, this DTC will be stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate | Note |
|---|---|---|---|---|---|---|
| P31B300 | Hybrid/EV Battery Voltage High | Charging cannot be prohibited when the voltage of any HV battery cell has exceeded the specified threshold.
(1 trip detection logic) |
·
Hybrid vehicle control ECU ·
HV battery junction block assembly |
Comes on | Master Warning:
Comes on |
SAE Code: P31B3 |
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 and wait for 2 minutes or more.
Turn the ignition switch to ON and turn the GTS on.
Drive the vehicle on urban roads for approximately 10 minutes.[*1]
[*1]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
Enter the following menus: Powertrain / HV Battery / Utility / All Readiness.
Check the DTC judgment result.
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 the normal judgment procedure again.
Refer to the wiring diagram for DTC P0AA649.
Refer to the precautions before inspecting high voltage circuit.
After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
When disconnecting and reconnecting the auxiliary battery
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
Check for DTCs.
| Result | Proceed to |
|---|---|
| "P31B300" only is output. | A |
| DTCs except "P31B300" of hybrid battery system are output. | B |
| DTCs except "P31B300" of hybrid control system are output. | C |
Turn the ignition switch off.
A
B
C
Read the freeze frame data of DTC P31B300.
| Result | Proceed to |
|---|---|
| OFF is displayed for "Ready Signal", "SMRB Control Status" and "SMRG Control Status" and -0.5 A or less is displayed for "Hybrid/EV Battery Current". | A |
| Other than above | B |
As the ignition switch ON state may cause the DTC to be stored, freeze frame data is used to judge the cause of the DTC output.
Turn the ignition switch off.
A
B
| Proceed to |
|---|
| OK |
| NG |
OK
NG
| Proceed to |
|---|
| NEXT |
NEXT