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

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]