LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2024 >> RX 500h >> Repair and Diagnosis >> External Pages >> Different car >> Section 23 (Hybrid Control System - Diagnostic Codes (1 Of 7)) >> HYBRID CONTROL SYSTEM (for PHEV Model) >> DTC P0A1F-94: Hybrid/EV Battery Energy Control Module Unexpected Operation [08/2023 - ] >> Procedure

DTC P0A1F-94: Hybrid/EV Battery Energy Control Module Unexpected Operation [08/2023 - ]: Procedure

WARNING: This page is about a different car, the 2025 Lexus RX 450h+ and 2024 Lexus RX 450h+. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC OUTPUT (HYBRID CONTROL AND HV BATTERY) 

    Pre-procedure1

    1. None.

      Procedure1

    2. 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

    3. Turn the ignition switch off.

    Result: 

    A 

    REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    B 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2023 - 10/2024]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2024 - ] 

    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

    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 appropriate service information because this may cause a malfunction.

      Procedure1

    2. Check the connections of the battery voltage sensor connectors.

      HINT: 

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [10/2022 - ]

      GTY1205482Courtesy 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

    3. None.

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPLACE NO. 2 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    A 

    See step  4

  4. CHECK FREEZE FRAME DATA 

    Pre-procedure1

    1. None.

      Procedure1

    2. 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

    3. 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) 

    Refer to PROCEDURE - Step 14

    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 [08/2023 - ] 

    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

    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 appropriate service information because this may cause a malfunction.

    2. Disconnect the battery voltage sensor connector.
      NOTE:

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

      GTY1203523Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Procedure1

    3. Measure the resistance according to the value(s) in the tables below.
      GTY1204320Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery Voltage Sensor)

      Standard Resistance

      Tester Connection Condition Specified Condition
      z20-11 (GA3) - z20-23 (VA36) Ignition switch off Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. Reconnect the battery voltage sensor connector.

    Result: 

    NG 

    REPLACE NO. 2 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    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

    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 appropriate service information because this may cause a malfunction.

    2. Disconnect the battery voltage sensor connector.
      NOTE:

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

      GTY1205109Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Disconnect the B No. 1 HV supply stack sub-assembly connector.
      GTY999120Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Procedure1

    4. Measure the resistance according to the value(s) in the tables below.
      GTY1206187Courtesy 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
      B-16 (VA24) - z21-5 (GA2) Ignition switch off Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

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

    Result: 

    OK 

    REPLACE BATTERY VOLTAGE SENSOR. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    NG 

    REPLACE NO. 2 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

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

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    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 appropriate service information because this may cause a malfunction.

      Procedure1

    2. Check the connections of the battery voltage sensor connectors.

      HINT: 

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [10/2022 - ]

      GTY1205144Courtesy 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

    3. None.

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPLACE NO. 3 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    A 

    See step  9

  9. CHECK FREEZE FRAME DATA 

    Pre-procedure1

    1. None.

      Procedure1

    2. 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

    3. 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) 

    Refer to PROCEDURE - Step 17

    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 [08/2023 - ] 

    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

    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 appropriate service information because this may cause a malfunction.

    2. Disconnect the battery voltage sensor connectors.
      NOTE:

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

      GTY1205144Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Procedure1

    3. Measure the resistance according to the value(s) in the tables below.
      GTY1204914Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery Voltage Sensor)

      Standard Resistance

      Tester Connection Condition Specified Condition
      z23-14 (VA60) - z22-30 (GA5) Ignition switch off Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. Reconnect the battery voltage sensor connectors.

    Result: 

    NG 

    REPLACE NO. 3 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    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

    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 appropriate service information because this may cause a malfunction.

    2. Disconnect the battery voltage sensor connectors.
      NOTE:

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

      GTY1203726Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Procedure1

    3. Measure the resistance according to the value(s) in the tables below.
      GTY1205011Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery Voltage Sensor)

      Standard Resistance

      Tester Connection Condition Specified Condition
      z20-18 (VA48) - z23-11 (GA4) Ignition switch off Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. Reconnect the battery voltage sensor connectors.

    Result: 

    OK 

    REPLACE BATTERY VOLTAGE SENSOR. Refer to  REMOVAL [08/2023 - ] 

    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

    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 appropriate service information because this may cause a malfunction.

    2. Disconnect the HV battery high voltage connectors from the No. 2 traction battery device box assembly.
      GTY1206154Courtesy 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.

      Procedure1

    3. Measure the resistance according to the value(s) in the table below.
      GTY1205522Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (No. 2 Traction Battery Device Box Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      z27-1 (+) - z26-1 (-) Ignition switch off Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. 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 [08/2023 - ] 

    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

    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 appropriate service information because this may cause a malfunction.

    2. Disconnect the battery voltage sensor connector.
      NOTE:

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

      GTY1206121Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Disconnect the HV battery high voltage connector from the No. 2 traction battery device box assembly.
      GTY1205816Courtesy 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.

      Procedure1

    4. Measure the resistance according to the value(s) in the tables below.
      GTY1203932Courtesy 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
      z26-1 (-) - z23-11 (GA4) Ignition switch off Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

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

    Result: 

    OK 

    REPLACE NO. 2 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    NG 

    REPLACE NO. 3 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

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

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    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 appropriate service information because this may cause a malfunction.

      Procedure1

    2. Check the connections of the battery voltage sensor connectors.

      HINT: 

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [10/2022 - ]

      GTY1204742Courtesy 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 z22 is not connected securely The terminals are damaged or corroded C
      Connector z24 is not connected securely The terminals are damaged or corroded D

      Post-procedure1

    3. None.

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPLACE NO. 3 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    D 

    REPLACE NO. 4 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    A 

    See step  16

  16. CHECK FREEZE FRAME DATA 

    Pre-procedure1

    1. None.

      Procedure1

    2. 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

    3. 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) 

    Refer to PROCEDURE - Step 20

    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 [08/2023 - ] 

    Result: 

    B 

    See step  18

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

    Refer to PROCEDURE - Step 23

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE NO. 3 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    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

    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 appropriate service information because this may cause a malfunction.

    2. Disconnect the battery voltage sensor connector.
      NOTE:

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

      GTY1206122Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Disconnect the A No. 4 HV supply stack sub-assembly connector.
      GTY999152Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Procedure1

    4. Measure the resistance according to the value(s) in the tables below.
      GTY1205315Courtesy 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
      A-4 (GA6) - z22-26 (VA72) Ignition switch off Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

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

    Result: 

    OK 

    REPLACE BATTERY VOLTAGE SENSOR. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    NG 

    See step  20

  20. INSPECT SERVICE PLUG GRIP 

    Refer to INSPECTION [08/2023 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE SERVICE PLUG GRIP. Refer to  REMOVAL [08/2023 - ] 

    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

    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 appropriate service information because this may cause a malfunction.

    2. 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.
    3. 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.

      Procedure1

    4. 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
      C-1 (-) - A-4 (GA6) Ignition switch off Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    5. Reconnect the No. 4 HV supply stack sub-assembly connector.
    6. 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 [08/2023 - ] 

    Result: 

    NG 

    REPLACE NO. 4 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

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

    Refer to PROCEDURE - Step 24

    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 [08/2023 - ] 

    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

    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 appropriate service information because this may cause a malfunction.

    2. Disconnect the battery voltage sensor connector.
      NOTE:

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

      GTY1204519Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Procedure1

    3. Measure the resistance according to the value(s) in the tables below.
      GTY1204110Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Battery Voltage Sensor)

      Standard Resistance

      Tester Connection Condition Specified Condition
      z24-3 (GA7) - z24-16 (VA84) Ignition switch off Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. Reconnect the battery voltage sensor connector.

    Result: 

    OK 

    REPLACE BATTERY VOLTAGE SENSOR. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    NG 

    REPLACE NO. 4 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

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

    Be sure to wear insulated gloves and protective goggles.

    Pre-procedure1

    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 appropriate service information because this may cause a malfunction.

      Procedure1

    2. Check the connections of the battery voltage sensor connectors.

      HINT: 

      Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [10/2022 - ]

      GTY1205001Courtesy 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 z19 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

    3. None.

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPLACE NO. 1 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    D 

    REPLACE NO. 2 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    A 

    See step  25

  25. CHECK FREEZE FRAME DATA 

    Pre-procedure1

    1. None.

      Procedure1

    2. 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

    3. 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) 

    Refer to PROCEDURE - Step 7

    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 [08/2023 - ] 

    Result: 

    B 

    REPLACE BATTERY VOLTAGE SENSOR. Refer to  REMOVAL [08/2023 - ] 

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

    Refer to PROCEDURE - Step 10

    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 [08/2023 - ] 

    Result: 

    B 

    See step  28

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

    Refer to PROCEDURE - Step 13

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE NO. 2 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    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

    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 appropriate service information because this may cause a malfunction.

    2. Disconnect the battery voltage sensor connector.
      NOTE:

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

      GTY1205706Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Disconnect the B No. 1 HV supply stack sub-assembly connector.
      GTY999120Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Procedure1

    4. Measure the resistance according to the value(s) in the tables below.
      GTY1205340Courtesy 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
      B-11 (GA1) - z19-14 (VA12) Ignition switch off Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

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

    Result: 

    OK 

    REPLACE BATTERY VOLTAGE SENSOR. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    NG 

    REPLACE NO. 1 HV SUPPLY STACK SUB-ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

scientia non olet · About LEMON Manuals