DTC P0A81-00: Hybrid/EV Battery Cooling Fan 1 Control Circuit High; DTC P0A81-15: Hybrid/EV Battery Cooling Fan 1 Circuit Short to Auxiliary Battery or Open [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 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]