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Home >> Toyota >> 2025 >> Prius Plug-In Hybrid SE >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (Hybrid Control System (HEV) - Diagnostic Codes (1 Of 4)) >> HYBRID CONTROL SYSTEM (for M20A-FXS) >> DTC P0AA3-73: Hybrid/EV Battery Negative Contactor Actuator Stuck Closed [12/2022 - ] >> Procedure

DTC P0AA3-73: Hybrid/EV Battery Negative Contactor Actuator Stuck Closed [12/2022 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FREEZE FRAME DATA (HYBRID CONTROL) 

    Pre-procedure1

    • None.
    • Read the Freeze Frame Data of DTC P0AA3-73.

      Powertrain > Hybrid Control > DTC (P0AA3-73) > Freeze Frame Data 

      Tester Display
      VL-Voltage before Boosting
      VH-Voltage after Boosting
      NOTE:

      As freeze frame data is stored immediately before and after a DTC is stored, make sure to only read the values for the moment the DTC was stored ("0(s)").

      Result

      Result Proceed to
      Difference between "VL-Voltage before Boosting" and "VH-Voltage after Boosting" is less than 90 V. A
      Difference between "VL-Voltage before Boosting" and "VH-Voltage after Boosting" is 90 V or more. B

      HINT: 

      If VH-Voltage after Boosting is output even when an off command is being sent to the system main relay (positive side), P0AA3-73 is output. If the difference between the "VL-Voltage before Boosting" and the "VH-Voltage after Boosting" is large, it is determined that there is an inverter (VH sensor) malfunction.

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    B 

    REPLACE INVERTER WITH CONVERTER ASSEMBLY 

    Refer to REMOVAL [12/2022 - ]

    Result: 

    A 

    See step  2

  2. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR) 

    See step  1

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    See step  4

    Result: 

    NG 

    See step  3

  3. CONNECT SECURELY 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  4

  4. CHECK CONNECTOR CONNECTION CONDITION (FLOOR WIRE CONNECTOR) 

    See step  4

    Result

    Result Proceed to
    OK A
    NG (The connector is not connected securely.) B
    NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C

    Result: 

    A 

    See step  7

    Result: 

    C 

    See step  6

    Result: 

    B 

    See step  5

  5. CONNECT SECURELY 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  7

  6. REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  7

  7. CHECK CONNECTOR CONNECTION CONDITION (HV BATTERY JUNCTION BLOCK ASSEMBLY CONNECTOR) 

    See step  7

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    See step  9

    Result: 

    NG 

    See step  8

  8. CONNECT SECURELY 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  9

  9. CHECK GROUND WIRE CONNECTION CONDITION (SMR ACTIVATION LOW-VOLTAGE CIRCUIT) 

    See step  9

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    See step  11

    Result: 

    NG 

    See step  10

  10. CONNECT SECURELY 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - HV BATTERY JUNCTION BLOCK ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves.

    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 repair information because this may cause a malfunction.

    • Disconnect the HV battery junction block assembly connector.
    • Disconnect the hybrid vehicle control ECU connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition Result
      K11-27 (SMRG) - R42-6 (SMRG) Ignition switch off Below 1 Ω Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition Result
      K11-27 (SMRG) or R42-6 (SMRG) - Body ground and other terminals Ignition switch off 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the hybrid vehicle control ECU connector.
    • Reconnect the HV battery junction block assembly connector.

    Result: 

    OK 

    See step  13

    Result: 

    NG 

    See step  12

  12. REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (HV BATTERY JUNCTION BLOCK ASSEMBLY - BODY GROUND) 

    See step  13

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    See step  15

    Result: 

    NG 

    See step  14

  14. REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  15

  15. INSPECT HV BATTERY JUNCTION BLOCK ASSEMBLY (SMRG) 
    WARNING:

    Be sure to wear insulated gloves.

    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 repair information because this may cause a malfunction.

    • Disconnect the HV battery junction block assembly connector.
    • Measure the resistance according to the value(s) in the table below.
      GTY1144222Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (HV Battery Junction Block Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      R42-6 (SMRG) - R42-2 (GND) -40 to 80°C (-40 to 176°F) 20.6 to 40.8 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Reconnect the HV battery junction block assembly connector.

    Result: 

    NG 

    See step  18

    Result: 

    OK 

    See step  16

  16. CHECK HV BATTERY JUNCTION BLOCK ASSEMBLY (SMRG) 
    WARNING:

    Be sure to wear insulated gloves.

    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 repair information because this may cause a malfunction.

    • Disconnect the HV battery high voltage connectors from the HV battery junction block assembly.
      NOTE:

      Insulate each disconnected high-voltage connector with insulating tape. Wrap the connector from the wire harness side to the end of the connector.

      GTY1142770Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      e12-1 (CEI) - z16-1 (-) Ignition switch off 10 kΩ or higher

      HINT: 

      • If a system main relay is stuck closed, inspect the HV battery junction block assembly without removing it from the vehicle, in order to keep the relay closed.
      • If the result of reading the freeze frame data is A, the HV battery junction block assembly must be replaced. Measuring resistance can determine that this is either a present or past malfunction.
      GTY1148836Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (HV Battery Junction Block Assembly)

      Result

      Result Judgment Proceed to
      OK Past malfunction A
      NG Present malfunction B

    Post-procedure1

    • Reconnect the HV battery high voltage connectors.

    Result: 

    B 

    See step  19

    Result: 

    A 

    See step  17

  17. REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY 

    HINT: 

    Refer to REMOVAL [12/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  21

  18. REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY 

    HINT: 

    Refer to REMOVAL [12/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  21

  19. REPLACE HV BATTERY JUNCTION BLOCK ASSEMBLY 

    HINT: 

    Refer to REMOVAL [12/2022 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  20

  20. CHECK DTC OUTPUT (HYBRID CONTROL, MOTOR GENERATOR, HV BATTERY) 

    See step  20

    Result

    Result Proceed to
    DTCs are not output A
    DTCs of Hybrid Control System are output. B
    DTCs of Motor Generator Control System are output. C
    DTCs of Hybrid Battery System are output. D

    Result: 

    B 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2022 - ] 

    Result: 

    C 

    GO TO DTC CHART (MOTOR GENERATOR CONTROL SYSTEM) 

    Refer to DIAGNOSTIC TROUBLE CODE CHART [12/2022 - ]

    Result: 

    D 

    GO TO DTC CHART (HYBRID BATTERY SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2022 - ] 

    Refer to DIAGNOSTIC TROUBLE CODE CHART [12/2022 - ]

    Result: 

    A 

    See step  21

  21. CHECK HYBRID VEHICLE CONTROL ECU (CHECK FOR NORMAL OPERATION) 

    See step  21

    Result

    Result Proceed to
    Difference between "Hybrid/EV Battery Voltage" and "VL-Voltage before Boosting" is always less than 100 V. A
    Difference between "Hybrid/EV Battery Voltage" and "VL-Voltage before Boosting" is 100 V or more. B

    Result: 

    A 

    END 

    Result: 

    B 

    REPLACE HYBRID VEHICLE CONTROL ECU AND HV BATTERY JUNCTION BLOCK ASSEMBLY 

    HYBRID VEHICLE CONTROL ECU: Refer to REMOVAL [12/2022 - ]

    HV BATTERY JUNCTION BLOCK ASSEMBLY: Refer to REMOVAL [12/2022 - 03/2023] , or refer to REMOVAL [03/2023 - ]

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