DTC P0AFC-00: Hybrid/EV Battery Sensor Module; DTC P0AFC-16: Hybrid/EV Battery Sensor Module Circuit Voltage Below Threshold; DTC P0AFC-96: Hybrid/EV Battery Sensor Module Component Internal Failure; DTC P308A-12: Hybrid/EV Battery Voltage Sensor All Circuit Short to Auxiliary Battery [12/2019 - 11/2023]: Procedure

1. 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 repair information because this may cause a malfunction.

2. Remove the HV battery junction block assembly.

   Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

3. Check the connector connections and contact pressure of the relevant terminals of the battery voltage sensor connectors.

   Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [12/2019 - ]

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

   The connectors are connected securely and there are no contact pressure problems.

   Result

   Proceed to
   OK
   NG

4. Install the HV battery junction block assembly.

Result: 

NG 

CONNECT SECURELY 

Result: 

OK 

See step  2

1. Check that the service plug grip is not installed.
   NOTE:

   • Check and record any DTCs, INF codes and freeze frame data, then disconnect the cable from the negative (-) auxiliary battery terminal.
   • After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair information because this may cause a malfunction.
2. Remove the HV battery junction block assembly.

   Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

3. Connect the cable to the negative (-) auxiliary battery terminal.
4. Turn the ignition switch to ON.
5. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Battery Voltage Sensor)

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   y1-1 (IGCT) - y1-7 (GND)	Ignition switch ON	11 to 14 V

   NOTE:

   Turning the ignition switch to ON with the service plug grip removed causes other DTCs to be stored. Clear the DTCs after performing this inspection.

6. Turn the ignition switch off.
7. Disconnect the cable from the negative (-) auxiliary battery terminal.
8. Install the HV battery junction block assembly.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE BATTERY VOLTAGE SENSOR. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

Result: 

NG 

See step  3

1. 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 repair information because this may cause a malfunction.

2. Remove the HV battery junction block assembly.

   Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   y1-7 (GND) - Body ground	Ignition switch off	Below 1 Ω

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Battery Voltage Sensor)

4. Install the HV battery junction block assembly.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR (IGCT NO. 2 FUSE - BATTERY VOLTAGE SENSOR) 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY VOLTAGE SENSOR - BODY GROUND)