Toyota Corolla Cross: Hybrid/EV Battery Voltage High (P31B300)
DESCRIPTION
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) |
| Comes on |
Master Warning: Comes on |
SAE Code: P31B3 |
MONITOR DESCRIPTION
If the maximum voltage of any HV battery cell exceeds the threshold but charging continues to be performed, the battery ECU assembly will determine that there is a malfunction, illuminate the MIL and store this DTC.
MONITOR STRATEGY
|
Related DTCs | P31B3 (INF P31B300): Battery cell Voltage high |
|
Required sensors/components | Battery current sensor |
|
Frequency of operation | Continuous |
|
Duration | TMC's intellectual property |
|
MIL operation | 1 driving cycle |
|
Sequence of operation | None |
TYPICAL ENABLING CONDITIONS
|
The monitor will run 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
|
Battery ECU assembly | DTC P31B3 (INF P31B300) is not detected |
CONFIRMATION DRIVING PATTERN
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.
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- When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
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- 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]
HINT:
[*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.
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 the normal judgment procedure again.
WIRING DIAGRAM
Refer to the wiring diagram for DTC P0AA649.
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CAUTION / NOTICE / HINT
CAUTION:
Refer to the precautions before inspecting high voltage circuit.
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NOTICE:
- After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
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- When disconnecting and reconnecting the auxiliary battery
HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
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PROCEDURE
|
1. | CHECK DTC OUTPUT (HV BATTERY, HYBRID CONTROL) |
(a) Check for DTCs.
Powertrain > HV Battery > Trouble Codes Powertrain > Hybrid Control > Trouble Codes|
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 |
(b) Turn the ignition switch off.
| B | .gif) | GO TO DTC CHART (HYBRID BATTERY SYSTEM) |
| C | | GO TO DTC CHART (HYBRID CONTROL SYSTEM) |
|
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|
2. | CHECK FREEZE FRAME DATA (READY SIGNAL, SMR CONTROL STATUS, HYBRID/EV BATTERY CURRENT) |
(a) Read the freeze frame data of DTC P31B300.
Powertrain > HV Battery > Trouble Codes|
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 |
HINT:
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.
(b) Turn the ignition switch off.
| B | | REPLACE HYBRID VEHICLE CONTROL ECU |
|
|
3. | INSPECT HV BATTERY JUNCTION BLOCK ASSEMBLY (SMRB, SMRG) |
Click here
| NG | | REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY |
|
|
4. | PERFORM INITIALIZATION (CURRENT SENSOR OFFSET LEARNING) |
Click here
| NEXT | | END |
READ NEXT:
Extreme Hybrid/EV Battery Charging Current (P31B400)
DESCRIPTION The battery ECU assembly monitors its internal operation, it will set DTCs and perform fail-safe control when it detects the following malfunction.
DTC No. Detection Item
DT
Hybrid/EV Battery Internal Electronic Failure (P31B549)
DESCRIPTION The battery ECU assembly monitors its internal operation and will store these DTCs when it detects an internal malfunction.
DTC No. Detection Item
DTC Detection Condition
Hybrid/EV Battery Stack 1 Circuit Resistance Out of Range (P33DA1E,P33DB1E)
DESCRIPTION The HV battery is composed of 60 cells (3.7 V each) in series. The battery ECU assembly monitors the internal resistance of each HV battery cell to detect malfunctions of the HV battery.
SEE MORE:
Seat Heater Switch
RemovalREMOVAL CAUTION / NOTICE / HINT
Procedure Part Name Code
1 SWITCH BASE
55449D -
- -
2 REMOVE SEAT HEATER SWITCH
84751F
- - PROCEDURE
1. REMOVE SWITCH BASE 2. REMOVE SEAT HEATER SWITCH (for LH Side)
Precaution
PRECAUTION
PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE AUXILIARY BATTERY
TERMINAL
NOTICE:
After the ignition switch is turned off, there may be a waiting
time before disconnecting the negative (-) auxiliary battery terminal.
Click here
HINT:
When disconnecting and reconnecting the a
