If the voltage of an HV battery cell is lower than the threshold for a certain amount of time, the battery ECU assembly will interpret this as a malfunction.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate | Note |
|---|---|---|---|---|---|---|
| P1A6116 | Hybrid/EV Battery Stack 2 Cell Circuit Voltage Below Threshold | The voltage of any cell of the No. 2 HV supply stack sub-assembly has decreased excessively.
(1 trip detection logic) |
·
HV battery ·
Battery ECU assembly |
Comes on | Master Warning:
Comes on |
SAE Code: P1A61 |
| P31AB16 | Hybrid/EV Battery Stack 1 Cell Circuit Voltage Below Threshold | The voltage of any cell of the No. 1 HV supply stack sub-assembly has decreased excessively.
(1 trip detection logic) |
·
HV battery ·
Battery ECU assembly |
Comes on | Master Warning:
Comes on |
SAE Code: P31AB |
Do not charge the HV battery using the THS charger if DTC P1A6116 or P31AB16 is output.
If the battery ECU assembly detects that the voltage of any HV battery cell has decreased excessively, the battery ECU assembly will illuminate the MIL and store a DTC.
| Related DTCs | P1A61 (INF P1A6116), P31AB (INF P31AB16): Cell voltage low |
| Required sensors/components | Battery ECU assembly |
| Frequency of operation | Continuous |
| Duration | TMC's intellectual property |
| MIL operation | Immediately |
| Sequence of operation | None |
| The monitor will run whenever the following DTCs are not stored | TMC's intellectual property |
| Other conditions belong to TMC's intellectual property | - |
| TMC's intellectual property | - |
| Battery ECU assembly | DTC P1A61 (INF P1A6116) is not detected
DTC P31AB (INF P31AB16) is not detected |
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 P1A001C.
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 |
|---|---|
| "P1A6116 or P31AB16" only is output, or DTCs except the ones in the table below are also output. | A |
| DTCs of hybrid battery system in the table below are output. | B |
| DTCs of hybrid control system in the table below are output. | C |
| System | Relevant DTC | |
|---|---|---|
| Hybrid battery system | P060A47 | Hybrid/EV Battery Energy Control Module Monitoring Processor Watchdog / Safety MCU Failure |
| P060B49 | Hybrid/EV Battery Energy Control Module A/D Processing Internal Electronic Failure | |
| P060687 | Hybrid/EV Battery Energy Control Module Processor to Monitoring Processor Missing Message | |
| Hybrid control system | P0A1F94 | Hybrid/EV Battery Energy Control Module Unexpected Operation |
Turn the ignition switch off.
A
B
C
Check the DTCs that were output when the vehicle was brought to the workshop.
| Result | Proceed to |
|---|---|
| "P1A6116" is also output. | A |
| "P31AB16" is also output. | B |
A
B
| Result | Proceed to | |
|---|---|---|
| OK | A | |
| Not connected securely | The terminals are not damaged or corroded | B |
| Not connected securely | The terminals are damaged or corroded | C |
A
B
C
Read the value of freeze frame data items "Hybrid/EV Battery Cell 31 Voltage" through "Hybrid/EV Battery Cell 60 Voltage" for DTC P1A6116 and make a note if the value of any is 1.6 V or less.
Turn the ignition switch off.
| Proceed to |
|---|
| NEXT |
NEXT
| Result | Proceed to |
|---|---|
| The voltage between the terminals is 1.6 V or less. | A |
| Other than above | B |
A
B
| Result | Proceed to |
|---|---|
| The voltage between the terminals is 50 kΩ or more. | A |
| Other than above | B |
A
B
| Result | Proceed to | |
|---|---|---|
| OK | A | |
| Not connected securely | The terminals are not damaged or corroded | B |
| Not connected securely | The terminals are damaged or corroded | C |
A
B
C
Read the value of freeze frame data items "Hybrid/EV Battery Cell 1 Voltage" through "Hybrid/EV Battery Cell 30 Voltage" for DTC P31AB16 and make a note if the value of any is 1.6 V or less.
Turn the ignition switch off.
| Proceed to |
|---|
| NEXT |
NEXT
| Result | Proceed to |
|---|---|
| The voltage between the terminals is 1.6 V or less. | A |
| Other than above | B |
A
B
| Result | Proceed to |
|---|---|
| The voltage between the terminals is 50 kΩ or more. | A |
| Other than above | B |
A
B