Lexus ES: 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 an hybrid battery system malfunction, this DTC will be stored.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate |
|---|---|---|---|---|---|
| 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 Light: Comes on |
| DTC No. | Data List |
|---|---|
| P31B300 | Hybrid/EV Battery Cell 1 to 70 Voltage |
The following items can be helpful when performing repairs:
- WIN Control Limit Power
- Hybrid/EV Battery Current
- Hybrid/EV Battery Voltage
- Hybrid/EV Battery SOC
- SMRB Status
- SMRG Status
- SMRP Status
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 Techstream to the DLC3.
- Turn the power switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the power switch off and wait for 2 minutes or more.
- Turn the power switch on (IG) and turn the Techstream 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 or N/A, perform the normal judgment procedure again.
WIRING DIAGRAM
Refer to the wiring diagram for DTC P0AA649.
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CAUTION / NOTICE / HINT
CAUTION:
-
Before the following operations are conducted, take precautions to prevent electric shock by turning the power switch off, wearing insulated gloves, and removing the service plug grip from HV battery.
- Inspecting the high-voltage system
- Disconnecting the low voltage connector of the inverter with converter assembly
- Disconnecting the low voltage connector of the HV battery
-
To prevent electric shock, make sure to remove the service plug grip to cut off the high voltage circuit before servicing the vehicle.
-
After removing the service plug grip from the HV battery, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
-
After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.
*a
Without waiting for 10 minutes
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HINT:
Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.
-
Make sure to insulate the high-voltage connectors and terminals of the HV battery with insulating tape after removing it.
If the HV battery stored without insulating the connectors and terminals, electric shock or fire may result.
NOTICE:
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.
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PROCEDURE
| 1. | CHECK DTC OUTPUT (HV BATTERY, HYBRID CONTROL) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Enter the following menus: Powertrain / HV Battery and Hybrid Control / Trouble Codes.
(d) 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 |
(e) Turn the power 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 (HYBRID CONTROL) |
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Enter the following menus: Powertrain / HV Battery / Trouble Codes.
(d) Read the freeze frame data of DTC P31B300.
Powertrain > HV Battery > Trouble Codes| Result | Proceed to |
|---|---|
| OFF is displayed for "Ready Signal", "SMRP Control Status", "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 power switch on (IG) state may cause the DTC to be stored, freeze frame data is used to judge the cause of the DTC output.
(e) Turn the power switch off.
| B | | REPLACE HYBRID VEHICLE CONTROL ECU |
|
| 3. | INSPECT HV BATTERY JUNCTION BLOCK ASSEMBLY (SMRP, SMRB, SMRG) |
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| NG | | REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY |
|
| 4. | PERFORM INITIALIZATION (CURRENT SENSOR OFFSET LEARNING) |
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| NEXT | | END |
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