HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): P0A1F94; Hybrid/EV Battery Energy Control Module Unexpected Operation; 2023 - 2025 MY Corolla HV [09/2022

Last Modified: 07-31-2024	6.11:8.1.0	Doc ID: RM1000000026QOT
Model Year Start: 2023	Model: Corolla HV	Prod Date Range: [09/2022 - ]
Title: HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for LITHIUM-ION BATTERY with PA10): P0A1F94; Hybrid/EV Battery Energy Control Module Unexpected Operation; 2023 - 2025 MY Corolla HV [09/2022 - ]

DTC

P0A1F94

Hybrid/EV Battery Energy Control Module Unexpected Operation

DTC SUMMARY

MALFUNCTION DESCRIPTION

The hybrid vehicle control ECU (main CPU) monitors the battery ECU assembly.

The cause of this malfunction may be the following:

Battery ECU assembly internal malfunction

Battery ECU assembly malfunction

DESCRIPTION

The hybrid vehicle control ECU (main CPU) monitors the battery ECU assembly and stores this DTC when it detects a malfunction.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

P0A1F94

Hybrid/EV Battery Energy Control Module Unexpected Operation

The battery ECU assembly value received by the hybrid vehicle control ECU (main CPU) exceeds the threshold for a certain period of time.

(1 trip detection logic)

Battery ECU assembly

Comes on

Master Warning:

Comes on

SAE Code:

P0A1F

MONITOR DESCRIPTION

The battery ECU assembly monitors the hybrid vehicle control ECU via CAN communication. If the battery ECU assembly detects a malfunction in the hybrid vehicle control ECU, it will illuminate the MIL and store a DTC.

MONITOR STRATEGY

Related DTCs	P0A1F (INF P0A1F94): Battery Energy Control Module
Required sensors/components	Battery ECU assembly
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

Hybrid vehicle control ECU

P0A1F (INF P0A1F94) 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
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here

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.
Turn the ignition switch to ON (READY) 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 / Hybrid Control / 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.

PROCEDURE

1.	CHECK DTC OUTPUT (HYBRID CONTROL)

(a) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes

Result	Proceed to
P0A1F94 only is output.	A
DTCs except P0A1F94 are output.	B

(b) Turn the ignition switch off.

REPLACE BATTERY ECU ASSEMBLY

GO TO DTC CHART (HYBRID CONTROL SYSTEM)