| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000001N34V |
| Model Year Start: 2021 | Model: Corolla | Prod Date Range: [04/2020 - 09/2022] |
| Title: HYBRID / BATTERY CONTROL: HYBRID BATTERY SYSTEM (for LITHIUM-ION BATTERY with P610): P1A001C,P301A1C; Hybrid Battery Stack 2 Cell Voltage Detection Voltage Out of Range; 2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022] | ||
|
DTC |
P1A001C |
Hybrid Battery Stack 2 Cell Voltage Detection Voltage Out of Range |
|
DTC |
P301A1C |
Hybrid Battery Stack 1 Cell Voltage Detection Voltage Out of Range |
DESCRIPTION
The HV battery is composed of 56 cells (3.6 V each) in series. The battery ECU assembly monitors the voltage of each HV battery cell to detect malfunctions of the HV battery.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Warning Indicate |
|---|---|---|---|---|---|
|
P1A001C |
Hybrid Battery Stack 2 Cell Voltage Detection Voltage Out of Range |
An open is detected in the HV battery cell voltage detection circuits of the No. 2 HV supply stack sub-assembly. (1 trip detection logic) |
|
Comes on |
Master Warning: Comes on |
|
P301A1C |
Hybrid Battery Stack 1 Cell Voltage Detection Voltage Out of Range |
An open is detected in the HV battery cell voltage detection circuits of the No. 1 HV supply stack sub-assembly. (1 trip detection logic) |
|
Comes on |
Master Warning: Comes on |
Related Data List
|
DTC No. |
Data List |
|---|---|
|
P1A001C |
Hybrid/EV Battery Cell 1 to 56 Voltage |
|
P301A1C |
MONITOR DESCRIPTION
If the voltage of an HV battery cell is abnormal, the battery ECU assembly will determine that a malfunction has occurred. When the malfunction detection condition is satisfied, the battery ECU assembly will illuminate the MIL and store a DTC.
MONITOR STRATEGY
|
Related DTCs |
P1A00 (INF P1A001C), P301A (INF P301A1C): Battery voltage detection circuits malfunction |
|
Required sensors/components |
Battery ECU assembly |
|
Frequency of operation |
Continuous |
|
Duration |
TMC's intellectual property |
|
MIL operation |
Immediately |
|
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 P1A00 (INF P1A001C) is not detected DTC P301A (INF P301A1C) 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.
Click here
![2021 - 2022 MY Corolla Corolla HV [04/2020 - 09/2022]; HYBRID / BATTERY CONTROL: HYBRID BATTERY SYSTEM (for LITHIUM-ION BATTERY with P610): UTILITY](/t3Portal/stylegraphics/info.gif)
-
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
- 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.
-
With power switch on (IG) and wait for 10 seconds or more.[*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
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.
Click here
HINT:
Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.
*a
Without waiting for 10 minutes
-
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.
-
When disposing of an HV battery, make sure to return it through an authorized collection agent who is capable of handling it safely. If the HV battery is returned via the manufacturer specified route, it will be returned properly and in a safe manner by an authorized collection agent.
*a
Dealer
*b
Battery Collection Agent
- Accidents such as electric shock may result if the HV battery is disposed of improperly or abandoned. Therefore, make sure to return all HV batteries through an authorized collection agent.
-
Before returning the HV battery, make sure to perform a recovery inspection.
Click here
-
Before returning the HV supply stack sub-assembly, make sure to perform a recovery inspection.
Click here
- Make a note of the output DTCs as some of them may be necessary for recovery inspection of the HV battery and HV supply stack sub-assemblies.
-
After removing the HV battery, keep it away from water. Exposure to water may cause the HV battery to produce heat, resulting in a fire.
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.
Click here
HINT:
P1A001C or P301A1C may be output as a result of the malfunction indicated by the DTCs in table below.
- The chart above is listed in inspection order of priority.
- Check DTCs that are output at the same time by following the listed order. (The main cause of the malfunction can be determined without performing unnecessary inspections.)
|
Malfunction Content |
Relevant DTC |
|
|---|---|---|
|
Microcomputer malfunction |
P0A1F94 |
Hybrid/EV Battery Energy Control Module Unexpected Operation |
|
P062F46 |
Hybrid/EV Battery Energy Control Module EEPROM Calibration / Parameter Memory Failure |
|
|
P0A1D94 |
Hybrid/EV Powertrain Control Module Unexpected Operation |
|
|
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 |
|
|
P060A87 |
Hybrid/EV Battery Energy Control Module Processor from Monitoring Processor Missing Message |
|
|
P060629 |
Hybrid/EV Battery Energy Control Module Processor to Monitoring Processor Signal Invalid |
|
|
U029387 |
Lost Communication with Hybrid/EV Powertrain Control Module Missing Message |
|
|
U010087 |
Lost Communication with ECM/PCM "A" Missing Message |
|
|
U115087 |
Lost Communication with Hybrid Powertrain Control Module (Hybrid/EV Battery Local Bus) Missing Message |
|
|
P056014 |
System Voltage (BATT) Circuit Short to Ground or Open |
|
|
P0ABF00 |
Hybrid/EV Battery Current Sensor "A" Circuit Range/Performance |
|
PROCEDURE
|
1. |
CHECK DTC OUTPUT (HV BATTERY) |
(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) Check for DTCs.
Powertrain > HV Battery > Trouble Codes
|
Result |
Proceed to |
|---|---|
|
"P1A001C or P301A1C" 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 |
|
System |
Relevant DTC |
|
|---|---|---|
|
Hybrid battery system |
P0E2D00 |
Hybrid/EV Battery Energy Control Module Hybrid/EV Battery Monitor Performance |
|
P1AC413 |
Hybrid/EV Battery Stack 1 Current Interrupt Device Circuit Open |
|
|
P1AC49E |
Hybrid/EV Battery Stack 1 Current Interrupt Device Stuck On |
|
|
P1AC513 |
Hybrid/EV Battery Stack 2 Current Interrupt Device Circuit Open |
|
|
P1AC59E |
Hybrid/EV Battery Stack 2 Current Interrupt Device Stuck On |
|
|
P1AC613 |
Hybrid/EV Battery Stack 3 Current Interrupt Device Circuit Open |
|
|
P1AC69E |
Hybrid/EV Battery Stack 3 Current Interrupt Device Stuck On |
|
|
P1AC713 |
Hybrid/EV Battery Stack 4 Current Interrupt Device Circuit Open |
|
|
P1AC79E |
Hybrid/EV Battery Stack 4 Current Interrupt Device Stuck On |
|
(e) Turn the power switch off.
| B |
|
|
|
2. |
CHECK DTC |
(a) Check the DTCs that were output when the vehicle was brought to the workshop.
|
Result |
Proceed to |
|---|---|
|
"P1A001C" is also output. |
A |
|
"P301A1C" is also output. |
B |
| B |
|
|
|
3. |
CHECK CONNECTOR CONNECTION CONDITION (BATTERY ECU ASSEMBLY CONNECTOR) |
CAUTION:
Be sure to wear insulated gloves and protective goggles.
(a) Check that the service plug grip is not installed.
NOTICE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.
(b) Remove the No. 1 HV battery protector.
Click here
|
(c) Check the connector connections and contact pressure of the relevant terminals for the battery ECU assembly. Click here
OK: The connectors are connected securely and there are no contact problems. |
|
(d) Install the No. 1 HV battery protector.
|
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 |
| B |
|
CONNECT SECURELY |
| C |
|
|
|
4. |
CHECK FREEZE FRAME DATA (HV BATTERY) |
(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 value of freeze frame data items "Hybrid/EV Battery Cell 29 Voltage" through "Hybrid/EV Battery Cell 56 Voltage" for DTC P1A001C and make a note if the value of any is 1.6 V or less.
Powertrain > HV Battery > Trouble Codes
(e) Turn the power switch off.
|
Result |
Proceed to |
|---|---|
|
The voltage of any hybrid battery cell from 29 to 37 is 1.6 V or less. |
A |
|
The voltage of any hybrid battery cell from 38 to 56 is 1.6 V or less. |
B |
| B |
|
|
|
5. |
CHECK NO. 2 HV SUPPLY STACK SUB-ASSEMBLY (HYBRID BATTERY CELL 29 TO 37 VOLTAGE) |
Click here
|
Result |
Proceed to |
|---|---|
|
The voltage between the terminals is 1.6 V or less. |
A |
|
Other than above |
B |
| A |
|
| B |
|
|
6. |
CHECK NO. 2 HV SUPPLY STACK SUB-ASSEMBLY (HYBRID BATTERY CELL 38 TO 56 VOLTAGE) |
Click here
|
Result |
Proceed to |
|---|---|
|
The voltage between the terminals is 1.6 V or less. |
A |
|
Other than above |
B |
| A |
|
| B |
|
|
7. |
CHECK CONNECTOR CONNECTION CONDITION (BATTERY ECU ASSEMBLY CONNECTOR) |
CAUTION:
Be sure to wear insulated gloves and protective goggles.
(a) Check that the service plug grip is not installed.
NOTICE:
After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.
(b) Remove the No. 1 HV battery protector.
Click here
|
(c) Check the connector connections and contact pressure of the relevant terminals for the battery ECU assembly. Click here
OK: The connectors are connected securely and there are no contact problems. Result:
|
|
|||||||||||||
(d) Install the No. 1 HV battery protector.
| B |
|
CONNECT SECURELY |
| C |
|
|
|
8. |
CHECK FREEZE FRAME DATA (HV BATTERY) |
(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 value of freeze frame data items "Hybrid/EV Battery cell 1 voltage" through "Hybrid/EV Battery cell 28 voltage" for DTC P301A1C and make a note if the value of any is 1.6 V or less.
Powertrain > HV Battery > Trouble Codes
(e) Turn the power switch off.
|
Result |
Proceed to |
|---|---|
|
The voltage of any hybrid battery cell from 1 to 19 is 1.6 V or less. |
A |
|
The voltage of any hybrid battery cell from 20 to 28 is 1.6 V or less. |
B |
| B |
|
|
|
9. |
CHECK NO. 1 HV SUPPLY STACK SUB-ASSEMBLY (HYBRID BATTERY CELL 1 TO 19 VOLTAGE) |
Click here
|
Result |
Proceed to |
|---|---|
|
The voltage between the terminals is 1.6 V or less. |
A |
|
Other than above |
B |
| A |
|
| B |
|
|
10. |
CHECK NO. 1 HV SUPPLY STACK SUB-ASSEMBLY (HYBRID BATTERY CELL 20 TO 28 VOLTAGE) |
Click here
|
Result |
Proceed to |
|---|---|
|
The voltage between the terminals is 1.6 V or less. |
A |
|
Other than above |
B |
| A |
|
| B |
|
|
|