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Home >> Lexus >> 2024 >> TX 350 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 11 (Hybrid Control System - Diagnostic Codes (1 Of 6)) >> HYBRID CONTROL SYSTEM (for PHEV Model) >> DTC P0A1F-94: Hybrid/EV Battery Energy Control Module Unexpected Operation [12/2023 - ] >> Procedure

DTC P0A1F-94: Hybrid/EV Battery Energy Control Module Unexpected Operation [12/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 550h+. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC OUTPUT (HYBRID CONTROL, HV BATTERY) 

    Pre-procedure1

    • None.
    • Read and record the DTCs and freeze frame data.

      Powertrain > Hybrid Control > Trouble Codes 

      Powertrain > HV Battery > Trouble Codes 

      Result

      Result Proceed to
      P0A1F-94 only is output, or DTCs except the ones in the table below are also output. A
      DTCs of hybrid control system except P0A1F-94 are output. B
      Any of the following DTCs including pending DTCs are also output. C
      System Relevant DTC
      Hybrid battery system P1A00-1C Hybrid Battery Stack 2 Cell Voltage Detection Voltage Out of Range
      P1A05-1C Hybrid Battery Stack 3 Cell Voltage Detection Voltage Out of Range
      P1A0A-1C Hybrid Battery Stack 4 Cell Voltage Detection Voltage Out of Range
      P301A-1C Hybrid Battery Stack 1 Cell Voltage Detection Voltage Out of Range

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    A 

    REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    B 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2023 - ] 

    Result: 

    C 

    See step  2

  2. CHECK DTC 
    1. Check the DTCs that were output when the vehicle was brought to the workshop.

      Result

      Result Proceed to
      "P1A00-1C" is output. A
      "P1A05-1C" is output. B
      "P1A0A-1C" is output. C
      "P301A-1C" is output. D

    Result: 

    B 

    See step  8

    Result: 

    C 

    See step  15

    Result: 

    D 

    See step  24

    Result: 

    A 

    See step  3

  3. CHECK CONNECTOR CONNECTION CONDITION (BATTERY VOLTAGE SENSOR CONNECTOR) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • 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 service information because this may cause a malfunction.

    • Check the connections of the battery voltage sensor connectors.

      HINT: 

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [09/2023 - ]

      GTY1236418Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK

      The connector is connected securely and there are no contact problems.

      Result

      Result Proceed to
      OK A
      Not connected securely The terminals are not damaged or corroded B
      Not connected securely The terminals are damaged or corroded C

    Post-procedure1

    • None.

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPLACE NO. 2 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    A 

    See step  4

  4. CHECK FREEZE FRAME DATA 

    Pre-procedure1

    • None.
    • Read the value of freeze frame data items "Hybrid/EV Battery Cell 25 Voltage" through "Hybrid/EV Battery Cell 48 Voltage" for DTC P1A00-1C and make a note if the value of any is 1.6 V or less.

      Powertrain > HV Battery > Trouble Codes 

      Result

      Proceed to
      NEXT

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    NEXT 

    See step  5

  5. CHECK NO. 2 HV SUPPLY STACK SUB-ASSEMBLY (HYBRID BATTERY CELL 25 TO 48 VOLTAGE) 

    HINT: 

    Refer to PROCEDURE - Step 15

    Result

    Result Proceed to
    The voltage between the terminals is 1.6 V or less. A
    Other than above B

    Result: 

    A 

    REPLACE NO. 2 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    B 

    See step  6

  6. CHECK NO. 2 HV SUPPLY STACK SUB-ASSEMBLY 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • 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 service information because this may cause a malfunction.

    • Disconnect the battery voltage sensor connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY1230413Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Measure the resistance according to the value(s) in the tables below.
      GTY1231349Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery Voltage Sensor)

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      z22-11 (GA3) - z22-23 (VA36) Ignition switch off Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the battery voltage sensor connector.

    Result: 

    NG 

    REPLACE NO. 2 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    OK 

    See step  7

  7. CHECK NO. 2 HV SUPPLY STACK SUB-ASSEMBLY 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • 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 service information because this may cause a malfunction.

    • Disconnect the battery voltage sensor connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY1238683Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Disconnect the B No. 1 HV supply stack sub-assembly connector.
      GTY999120Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Measure the resistance according to the value(s) in the tables below.
      GTY1232699Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 2 HV Supply Stack Sub-assembly)
      *b Front view of wire harness connector
      (to Battery Voltage Sensor)

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      B-16 (VA24) - z21-5 (GA2) Ignition switch off Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the No. 1 HV supply stack sub-assembly connector.
    • Reconnect the battery voltage sensor connector.

    Result: 

    OK 

    REPLACE BATTERY VOLTAGE SENSOR. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPLACE NO. 2 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

  8. CHECK CONNECTOR CONNECTION CONDITION (BATTERY VOLTAGE SENSOR CONNECTOR) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • 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 service information because this may cause a malfunction.

    • Check the connections of the battery voltage sensor connectors.

      HINT: 

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [09/2023 - ]

      GTY1237967Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK

      The connector is connected securely and there are no contact problems.

      Result

      Result Proceed to
      OK A
      Not connected securely The terminals are not damaged or corroded B
      Not connected securely The terminals are damaged or corroded C

    Post-procedure1

    • None.

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPLACE NO. 3 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    A 

    See step  9

  9. CHECK FREEZE FRAME DATA 

    Pre-procedure1

    • None.
    • Read the value of freeze frame data items "Hybrid/EV Battery Cell 49 Voltage" through "Hybrid/EV Battery Cell 72 Voltage" for DTC P1A05-1C and make a note if the value of any is 1.6 V or less.

      Powertrain > HV Battery > Trouble Codes 

      Result

      Proceed to
      NEXT

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    NEXT 

    See step  10

  10. CHECK NO. 3 HV SUPPLY STACK SUB-ASSEMBLY (HYBRID BATTERY CELL 49 TO 72 VOLTAGE) 

    HINT: 

    Refer to PROCEDURE - Step 18

    Result

    Result Proceed to
    The voltage between the terminals is 1.6 V or less. A
    Other than above B

    Result: 

    A 

    REPLACE NO. 3 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    B 

    See step  11

  11. CHECK NO. 3 HV SUPPLY STACK SUB-ASSEMBLY 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • 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 service information because this may cause a malfunction.

    • Disconnect the battery voltage sensor connectors.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY1237967Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Measure the resistance according to the value(s) in the tables below.
      GTY1230790Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery Voltage Sensor)

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      z23-14 (VA60) - z24-30 (GA5) Ignition switch off Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the battery voltage sensor connectors.

    Result: 

    NG 

    REPLACE NO. 3 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    OK 

    See step  12

  12. CHECK NO. 3 HV SUPPLY STACK SUB-ASSEMBLY 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • 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 service information because this may cause a malfunction.

    • Disconnect the battery voltage sensor connectors.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY1229976Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Measure the resistance according to the value(s) in the tables below.
      GTY1241432Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery Voltage Sensor)

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      z22-18 (VA48) - z23-11 (GA4) Ignition switch off Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the battery voltage sensor connectors.

    Result: 

    OK 

    REPLACE BATTERY VOLTAGE SENSOR. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    See step  13

  13. INSPECT NO. 2 TRACTION BATTERY DEVICE BOX ASSEMBLY (NO. 3 HV SUPPLY STACK SUB-ASSEMBLY - NO. 2 HV SUPPLY STACK SUB-ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • 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 service information because this may cause a malfunction.

    • Disconnect the HV battery high voltage connectors from the No. 2 traction battery device box assembly.
      GTY1229719Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • Before disconnecting the connector, check that it is not loose or disconnected.
      • Insulate each disconnected high-voltage connector with insulating tape. Wrap the connector from the wire harness side to the end of the connector.
    • Measure the resistance according to the value(s) in the table below.
      GTY1236221Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (No. 2 Traction Battery Device Box Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      z28-1 (+) - z29-1 (-) Ignition switch off Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the HV battery high voltage connectors to the No. 2 traction battery device box assembly.

    Result: 

    NG 

    REPLACE NO. 2 TRACTION BATTERY DEVICE BOX ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    OK 

    See step  14

  14. CHECK NO. 3 HV SUPPLY STACK SUB-ASSEMBLY 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • 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 service information because this may cause a malfunction.

    • Disconnect the battery voltage sensor connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY1239965Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Disconnect the HV battery high voltage connector from the No. 2 traction battery device box assembly.
      GTY1231071Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • Before disconnecting the connector, check that it is not loose or disconnected.
      • Insulate each disconnected high-voltage connector with insulating tape. Wrap the connector from the wire harness side to the end of the connector.
    • Measure the resistance according to the value(s) in the tables below.
      GTY1239269Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 2 Traction Battery Device Box Assembly)
      *b Front view of wire harness connector
      (to Battery Voltage Sensor)

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      z28-1 (+) - z23-11 (GA4) Ignition switch off Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the HV battery high voltage connector to the No. 2 traction battery device box assembly.
    • Reconnect the battery voltage sensor connector.

    Result: 

    OK 

    REPLACE NO. 2 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPLACE NO. 3 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

  15. CHECK CONNECTOR CONNECTION CONDITION (BATTERY VOLTAGE SENSOR CONNECTOR) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • 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 service information because this may cause a malfunction.

    • Check the connections of the battery voltage sensor connectors.

      HINT: 

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [09/2023 - ]

      GTY1227928Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK

      The connector is connected securely and there are no contact problems.

      Result

      Result Proceed to
      OK A
      Not connected securely The terminals are not damaged or corroded B
      Connector z24 is not connected securely The terminals are damaged or corroded C
      Connector z25 is not connected securely The terminals are damaged or corroded D

    Post-procedure1

    • None.

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPLACE NO. 3 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    D 

    REPLACE NO. 4 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    A 

    See step  16

  16. CHECK FREEZE FRAME DATA 

    Pre-procedure1

    • None.
    • Read the value of freeze frame data items "Hybrid/EV Battery Cell 73 Voltage" through "Hybrid/EV Battery Cell 96 Voltage" for DTC P1A0A-1C and make a note if the value of any is 1.6 V or less.

      Powertrain > HV Battery > Trouble Codes 

      Result

      Result Proceed to
      The value of any of the freeze frame data items "Hybrid/EV Battery Cell 73 Voltage" through "Hybrid/EV Battery Cell 80 Voltage" is 1.6 V or less. A
      The value of any of the freeze frame data items "Hybrid/EV Battery Cell 81 Voltage" through "Hybrid/EV Battery Cell 96 Voltage" is 1.6 V or less. B

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    B 

    See step  22

    Result: 

    A 

    See step  17

  17. CHECK NO. 4 HV SUPPLY STACK SUB-ASSEMBLY (HYBRID BATTERY CELL 73 TO 80 VOLTAGE) 

    HINT: 

    Refer to PROCEDURE - Step 21

    Result

    Result Proceed to
    The voltage between the terminals is 1.6 V or less. A
    Other than above B

    Result: 

    A 

    REPLACE NO. 4 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    B 

    See step  18

  18. CHECK HARNESS AND CONNECTOR (BATTERY VOLTAGE SENSOR - NO. 3 HV SUPPLY STACK SUB-ASSEMBLY) 

    HINT: 

    Refer to PROCEDURE - Step 24

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE NO. 3 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    OK 

    See step  19

  19. CHECK NO. 4 HV SUPPLY STACK SUB-ASSEMBLY 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • 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 service information because this may cause a malfunction.

    • Disconnect the battery voltage sensor connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY1232068Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Disconnect the A No. 4 HV supply stack sub-assembly connector.
      GTY999152Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Measure the resistance according to the value(s) in the tables below.
      GTY1241101Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 3 HV Supply Stack Sub-assembly)
      *b Front view of wire harness connector
      (to Battery Voltage Sensor)

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      A-4 (GA6) - z24-26 (VA72) Ignition switch off Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the No. 4 HV supply stack sub-assembly connector.
    • Reconnect the battery voltage sensor connector.

    Result: 

    OK 

    REPLACE BATTERY VOLTAGE SENSOR. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    See step  20

  20. INSPECT SERVICE PLUG GRIP 

    Refer to INSPECTION [12/2023 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE SERVICE PLUG GRIP. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    OK 

    See step  21

  21. CHECK NO. 4 HV SUPPLY STACK SUB-ASSEMBLY 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • 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 service information because this may cause a malfunction.

    • Disconnect the HV battery high voltage connectors from the No. 4 HV supply stack sub-assembly.
      GTY999215Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • Insulate each disconnected high-voltage connector with insulating tape. Wrap the connector from the wire harness side to the end of the connector.
      • Before disconnecting the connector, check that it is not loose or disconnected.
    • Disconnect the A No. 4 HV supply stack sub-assembly connector.
      GTY999152Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

    • Measure the resistance according to the value(s) in the tables below.
      GTY999970Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (No. 4 HV Supply Stack Sub-assembly)      		 *b Front view of wire harness connector
      (to No. 3 HV Supply Stack Sub-assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      C-1 (-) - A-4 (GA6) Ignition switch off Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the No. 4 HV supply stack sub-assembly connector.
    • Reconnect the HV battery high voltage connectors to the No. 4 HV supply stack sub-assembly.

    Result: 

    OK 

    REPLACE NO. 3 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPLACE NO. 4 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

  22. CHECK NO. 4 HV SUPPLY STACK SUB-ASSEMBLY (HYBRID BATTERY CELL 81 TO 96 VOLTAGE) 

    HINT: 

    Refer to PROCEDURE - Step 25

    Result

    Result Proceed to
    The voltage between the terminals is 1.6 V or less. A
    Other than above B

    Result: 

    A 

    REPLACE NO. 4 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    B 

    See step  23

  23. CHECK NO. 4 HV SUPPLY STACK SUB-ASSEMBLY 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • 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 service information because this may cause a malfunction.

    • Disconnect the battery voltage sensor connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY1235668Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Measure the resistance according to the value(s) in the tables below.
      GTY1239072Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery Voltage Sensor)

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      z25-3 (GA7) - z25-16 (VA84) Ignition switch off Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the battery voltage sensor connector.

    Result: 

    OK 

    REPLACE BATTERY VOLTAGE SENSOR. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPLACE NO. 4 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

  24. CHECK CONNECTOR CONNECTION CONDITION (BATTERY VOLTAGE SENSOR CONNECTOR) 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • 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 service information because this may cause a malfunction.

    • Check the connections of the battery voltage sensor connectors.

      HINT: 

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [09/2023 - ]

      GTY1229226Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK

      The connector is connected securely and there are no contact problems.

      Result

      Result Proceed to
      OK A
      Not connected securely The terminals are not damaged or corroded B
      Connector z20 is not connected securely The terminals are damaged or corroded C
      Connector z21 is not connected securely The terminals are damaged or corroded D

    Post-procedure1

    • None.

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPLACE NO. 1 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    D 

    REPLACE NO. 2 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    A 

    See step  25

  25. CHECK FREEZE FRAME DATA 

    Pre-procedure1

    • None.
    • Read the value of freeze frame data items "Hybrid/EV Battery Cell 1 Voltage" through "Hybrid/EV Battery Cell 24 Voltage" for DTC P301A-1C and make a note if the value of any is 1.6 V or less.

      Powertrain > HV Battery > Trouble Codes 

      Result

      Result Proceed to
      The value of any of the freeze frame data items "Hybrid/EV Battery Cell 1 Voltage" through "Hybrid/EV Battery Cell 12 Voltage" is 1.6 V or less. A
      The value of any of the freeze frame data items "Hybrid/EV Battery Cell 13 Voltage" through "Hybrid/EV Battery Cell 24 Voltage" is 1.6 V or less. B

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    B 

    See step  27

    Result: 

    A 

    See step  26

  26. CHECK NO. 1 HV SUPPLY STACK SUB-ASSEMBLY (HYBRID BATTERY CELL 1 TO 12 VOLTAGE) 

    HINT: 

    Refer to PROCEDURE - Step 8

    Result

    Result Proceed to
    The voltage between the terminals is 1.6 V or less. A
    Other than above B

    Result: 

    A 

    REPLACE NO. 1 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    B 

    REPLACE BATTERY VOLTAGE SENSOR. Refer to  REMOVAL [12/2023 - ] 

  27. CHECK NO. 1 HV SUPPLY STACK SUB-ASSEMBLY (HYBRID BATTERY CELL 13 TO 24 VOLTAGE) 

    HINT: 

    Refer to PROCEDURE - Step 11

    Result

    Result Proceed to
    The voltage between the terminals is 1.6 V or less. A
    Other than above B

    Result: 

    A 

    REPLACE NO. 1 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    B 

    See step  28

  28. CHECK HARNESS AND CONNECTOR (BATTERY VOLTAGE SENSOR - NO. 2 HV SUPPLY STACK SUB-ASSEMBLY) 

    HINT: 

    Refer to PROCEDURE - Step 14

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE NO. 2 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    OK 

    See step  29

  29. CHECK NO. 1 HV SUPPLY STACK SUB-ASSEMBLY 
    WARNING:

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    • 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 service information because this may cause a malfunction.

    • Disconnect the battery voltage sensor connector.
      NOTE:

      Before disconnecting the connector, check that it is not loose or disconnected.

      GTY1235338Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Disconnect the B No. 1 HV supply stack sub-assembly connector.
      GTY999120Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Measure the resistance according to the value(s) in the tables below.
      GTY1237092Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 2 HV Supply Stack Sub-assembly)
      *b Front view of wire harness connector
      (to Battery Voltage Sensor)

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      B-11 (GA1) - z20-14 (VA12) Ignition switch off Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the No. 1 HV supply stack sub-assembly connector.
    • Reconnect the battery voltage sensor connector.

    Result: 

    OK 

    REPLACE BATTERY VOLTAGE SENSOR. Refer to  REMOVAL [12/2023 - ] 

    Result: 

    NG 

    REPLACE NO. 1 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

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