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 [04/2018 - 08/2020]: Procedure

WARNING: This page is about a different car, the 2020 Toyota Avalon and 2019 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DTC OUTPUT (HYBRID CONTROL)

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain/Hybrid Control/Trouble Codes.

Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes

Result

Result	Proceed to
P0AFC-00 or P0AFC-96 is not output.	A
P0AFC-00 or P0AFC-96 is output.	B

Turn the power switch off.

Result:

GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to DIAGNOSTIC TROUBLE CODE CHART [04/2018 - 08/2020]

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 power switch on (READY), unless instructed by the repair information because this may cause a malfunction.
Remove the rear seat cushion leg sub-assembly.
Refer to PROCEDURE - Step 9

Check that the No. 1 HV battery intake filter, battery cooling blower assembly, No. 1 hybrid battery intake duct and No. 1 hybrid battery intake duct LH 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 VOLTAGE SENSOR - 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 (HYBRID VEHICLE CONTROL ECU - 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 HYBRID VEHICLE CONTROL ECU (GROUND SHORT CHECK)

Remove the hybrid vehicle control ECU.
Refer to REMOVAL [04/2018 - 08/2021]

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

Standard Resistance

Tester Connection	Condition	Specified Condition
G47-29 (SI0) - G46-5 (E01)	Power switch off	10 kΩ or higher
G47-29 (SI0) - G47-5 (E02)	Power switch off	10 kΩ or higher

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Component without harness connected (Hybrid Vehicle Control ECU)

Install the hybrid vehicle control ECU.

Result

Proceed to
OK
NG

Result:

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to REMOVAL [04/2018 - 08/2021]

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 Battery Cooling Fan 1 Frequency) and the actual measured value at the battery voltage sensor connector are 0 Hz.	A
Other than above	B

Result:

See step 8

Result:

See step 7

CHECK BATTERY VOLTAGE SENSOR
See step 5

Result

Proceed to

OK

NG

Result:

OK

REPLACE BATTERY COOLING BLOWER ASSEMBLY. Refer to REMOVAL [04/2018 - ]

Result:

NG

REPLACE BATTERY VOLTAGE SENSOR. Refer to REMOVAL [04/2018 - 08/2020]
CHECK BATTERY VOLTAGE SENSOR (FREQUENCY)
See step 6

Result

Proceed to

OK

NG

Result:

OK

REPLACE BATTERY COOLING BLOWER ASSEMBLY. Refer to REMOVAL [04/2018 - ]

Result:

NG

REPLACE BATTERY VOLTAGE SENSOR. Refer to REMOVAL [04/2018 - 08/2020]