DTC P0A81-96: Hybrid/EV Battery Cooling Fan 1 Component Internal Failure; DTC P0A81-98: Hybrid/EV Battery Cooling Fan 1 Component or System Over Temperature [06/2020 - ]: Procedure

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CHECK DTC OUTPUT (HV BATTERY, HYBRID CONTROL)

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Enter the following menus: Powertrain / HV Battery and Hybrid Control / Trouble Codes.

Check for DTCs.

Powertrain > HV Battery > Trouble Codes

Powertrain > Hybrid Control > Trouble Codes

Result

Result	Proceed to
"P0A81-96 or P0A81-98" 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	P060A-47	Hybrid/EV Battery Energy Control Module Monitoring Processor Watchdog / Safety MCU Failure
	P060B-49	Hybrid/EV Battery Energy Control Module A/D Processing Internal Electronic Failure
	P0606-87	Hybrid/EV Battery Energy Control Module Processor to Monitoring Processor Missing Message
Hybrid control system	P0A1F-94	Hybrid/EV Battery Energy Control Module Unexpected Operation

Turn the ignition switch off.

Result:

GO TO DTC CHART (HYBRID BATTERY SYSTEM)

Refer to DIAGNOSTIC TROUBLE CODE CHART [06/2020 - ]

Result:

GO TO DTC CHART (HYBRID CONTROL SYSTEM)

Refer to DIAGNOSTIC TROUBLE CODE CHART [06/2020 - 12/2021] , or refer to DIAGNOSTIC TROUBLE CODE CHART [12/2021 - 11/2024] , or refer to DIAGNOSTIC TROUBLE CODE CHART [11/2024 - ]

Result:

See step 2

CHECK DUCT AND BLOWER

WARNING:

Be sure to wear insulated gloves.

Check that the service plug grip is not installed.
NOTE:
After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the appropriate service information because this may cause a malfunction.
Remove the rear seat cushion leg sub-assembly.
Refer to PROCEDURE - Step 8

Check that the No. 1 HV battery intake filter, battery cooling blower assembly and No. 1 hybrid battery intake duct are not disconnected, damaged, or clogged with foreign matter.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*1	No. 1 HV Battery Intake Filter	*2	Battery Cooling Blower Assembly
*3	No. 1 Hybrid Battery Intake Duct	*4	No. 1 Hybrid Battery Intake Duct LH

The No. 1 HV battery intake filter, No. 1 hybrid battery intake duct, No. 1 hybrid battery intake duct LH and battery cooling blower assembly blower are not disconnected, damaged, or clogged with foreign matter.

Install the rear seat cushion leg sub-assembly.

Result

Proceed to
OK
NG

Result:

CORRECT THE PROBLEM

Result:

See step 3

CHECK HARNESS AND CONNECTOR (BATTERY ECU ASSEMBLY - BATTERY COOLING BLOWER ASSEMBLY)
See step 3

Result

Proceed to

OK

NG

Result:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

OK

See step 4
CHECK HARNESS AND CONNECTOR (BATTERY ECU ASSEMBLY - BATTERY COOLING BLOWER ASSEMBLY)
See step 9

Result

Proceed to

OK

NG

Result:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Result:

OK

See step 5

CHECK BATTERY ECU ASSEMBLY (GROUND SHORT CHECK)

Remove the battery ECU assembly.
Refer to REMOVAL [06/2020 - 08/2020] , or refer to REMOVAL [08/2020 - 12/2021] , or refer to REMOVAL [12/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

Measure the resistance according to the value(s) in the table below.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Component without harness connected
(Battery ECU Assembly)

Standard Resistance

Tester Connection	Condition	Specified Condition
z26-14 (SI0) -z26-27 (GND)	Ignition switch off	10 kΩ or higher
z26-14 (SI0) -z26-3 (GND1)	Ignition switch off	10 kΩ or higher

Install the battery ECU assembly.

Result

Proceed to
OK
NG

Result:

REPLACE BATTERY ECU ASSEMBLY

Refer to REMOVAL [06/2020 - 08/2020] , or refer to REMOVAL [08/2020 - 12/2021] , or refer to REMOVAL [12/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]

Result:

See step 6

READ VALUE USING TECHSTREAM (COOLING FAN FREQUENCY)

See step 4

Result

Result	Proceed to
Both of the value in the Data List (Hybrid/EV Battery Cooling Fan 1 Frequency) and the actual measured value at the floor wire connector are 0 Hz.	A
Other than above	B

Result:

See step 8

Result:

See step 7

CHECK BATTERY ECU ASSEMBLY
See step 5

Result

Proceed to

OK

NG

Result:

OK

REPLACE BATTERY COOLING BLOWER ASSEMBLY

Refer to REMOVAL [11/2018 - ]

Result:

NG

REPLACE BATTERY ECU ASSEMBLY

Refer to REMOVAL [06/2020 - 08/2020] , or refer to REMOVAL [08/2020 - 12/2021] , or refer to REMOVAL [12/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]
CHECK BATTERY ECU ASSEMBLY (FREQUENCY)
See step 6

Result

Proceed to

OK

NG

Result:

OK

REPLACE BATTERY COOLING BLOWER ASSEMBLY

Refer to REMOVAL [11/2018 - ]

Result:

NG

REPLACE BATTERY ECU ASSEMBLY

Refer to REMOVAL [06/2020 - 08/2020] , or refer to REMOVAL [08/2020 - 12/2021] , or refer to REMOVAL [12/2021 - 10/2022] , or refer to REMOVAL [10/2022 - 10/2023] , or refer to REMOVAL [10/2023 - ]