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Home >> Lexus >> 2024 >> TX 350 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 85 (Hybrid Control System - Diagnostic Codes (2 Of 5)) >> HYBRID CONTROL SYSTEM (for 1Motor-HEV Model) >> DTC P0AA3-73: Hybrid/EV Battery Negative Contactor Actuator Stuck Closed [09/2023 - ] >> Procedure

DTC P0AA3-73: Hybrid/EV Battery Negative Contactor Actuator Stuck Closed [09/2023 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC OUTPUT (HYBRID CONTROL, MOTOR GENERATOR) 

    Pre-procedure1

    • None.
    • Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Powertrain > Motor Generator > Trouble Codes 

      Result

      Result Proceed to
      P0AA3-73 only is output, or DTCs except the ones in the table below are also output. A
      DTCs of Hybrid Control System in the tables below are output. B
      DTCs of Motor Generator Control System in the tables below are output. C
      Malfunction Content System Relevant DTC
      Microcomputer malfunction Hybrid Control System P0606-47 Hybrid/EV Powertrain Control Module Processor Watchdog / Safety MCU Failure
      P0606-87 Hybrid/EV Powertrain Control Module Processor to Monitoring Processor Missing Message
      P060A-47 Hybrid/EV Powertrain Control Module Monitoring Processor Watchdog / Safety MCU Failure
      P060A-87 Hybrid/EV Powertrain Control Module Processor from Monitoring Processor Missing Message
      P1C9E-9F Hybrid/EV System Reset Stuck Off
      P0AFC-96 Hybrid/EV Battery Sensor Module Component Internal Failure
      P0AFC-00 Hybrid/EV Battery Sensor Module
      Motor Generator Control System P0A1B-29 Drive Motor "A" Control Module Signal Invalid
      P0A1B-47 Drive Motor "A" Control Module Watchdog / Safety MC Failure
      P0A1B-1F Generator Control Module Circuit Intermittent
      P1C2B-1C Drive Motor "A" Control Module A/D Converter Circuit Voltage Out of Range
      P1CAD-49 Drive Motor "A" Position Sensor Internal Electronic Failure
      P1CB0-38 Drive Motor "A" Position Sensor REF Signal Frequency Incorrect
      Power source circuit malfunction Hybrid Control System P0AFC-16 Hybrid/EV Battery Sensor Module Circuit Voltage Below Threshold
      Motor Generator Control System P06D6-1C Generator Control Module Offset Power Circuit Voltage Out of Range
      P06B0-1C Generator Control Module Position Sensor REF Power Source Circuit Voltage Out of Range
      Communication system malfunction Hybrid Control System U117E-87 Lost Communication with Drive Motor Control Module "A" (ch4) Missing Message
      U029A-87 Lost Communication with Hybrid/EV Battery Sensor Module Missing Message
      Sensor and actuator circuit malfunction Hybrid Control System P0AD9-11 Hybrid/EV Battery Positive Contactor Circuit Short to Ground
      P0AD9-15 Hybrid/EV Battery Positive Contactor Circuit Short to Auxiliary Battery or Open
      P0ADD-11 Hybrid/EV Battery Negative Contactor Circuit Short to Ground
      P0ADD-15 Hybrid/EV Battery Negative Contactor Circuit Short to Auxiliary Battery or Open
      P0AE4-11 Hybrid/EV Battery Precharge Contactor Circuit Short to Ground
      P0AE4-15 Hybrid/EV Battery Precharge Contactor Circuit Short to Auxiliary Battery or Open
      P0B3B-14 Hybrid/EV Battery Voltage Sensor "A" Circuit Short to Ground or Open
      P0B40-14 Hybrid/EV Battery Voltage Sensor "B" Circuit Short to Ground or Open
      P0B45-14 Hybrid/EV Battery Voltage Sensor "C" Circuit Short to Ground or Open
      P0B4A-14 Hybrid/EV Battery Voltage Sensor "D" Circuit Short to Ground or Open
      P0B4F-14 Hybrid/EV Battery Voltage Sensor "E" Circuit Short to Ground or Open
      P0B54-14 Hybrid/EV Battery Voltage Sensor "F" Circuit Short to Ground or Open
      P0B59-14 Hybrid/EV Battery Voltage Sensor "G" Circuit Short to Ground or Open
      P0B5E-14 Hybrid/EV Battery Voltage Sensor "H" Circuit Short to Ground or Open
      P0B63-14 Hybrid/EV Battery Voltage Sensor "I" Circuit Short to Ground or Open
      P0B68-14 Hybrid/EV Battery Voltage Sensor "J" Circuit Short to Ground or Open
      P0B6D-14 Hybrid/EV Battery Voltage Sensor "K" Circuit Short to Ground or Open
      P308A-13 Hybrid/EV Battery Voltage Sensor All Circuit Open
      P0AFC-62 Hybrid/EV Battery Sensor Module Signal Compare Failure
      P308A-12 Hybrid/EV Battery Voltage Sensor All Circuit Short to Auxiliary Battery
      Motor Generator Control System P0A3F-16 Drive Motor "A" Position Sensor Circuit Voltage Below Threshold
      P0C50-13 Drive Motor "A" Position Sensor Circuit "A" Circuit Open
      P0C50-16 Drive Motor "A" Position Sensor Circuit "A" Circuit Voltage Below Threshold
      P0C50-17 Drive Motor "A" Position Sensor Circuit "A" Circuit Voltage Above Threshold
      P0C5A-13 Drive Motor "A" Position Sensor Circuit "B" Circuit Open
      P0C5A-16 Drive Motor "A" Position Sensor Circuit "B" Circuit Voltage Below Threshold
      P0C5A-17 Drive Motor "A" Position Sensor Circuit "B" Circuit Voltage Above Threshold
      System malfunction Hybrid Control System P0C76-00 Hybrid/EV Battery System Discharge Time Too Long
      P0D2D-1C Drive Motor "A" Inverter Voltage Sensor Voltage Out of Range
      P1C83-49 High Voltage Power Resource Circuit Voltage Sensor after Boosting Malfunction
      Motor Generator Control System P0D2D-16 Drive Motor "A" Inverter Voltage Sensor (VH) Circuit Voltage Below Threshold
      P0D2D-17 Drive Motor "A" Inverter Voltage Sensor (VH) Circuit Voltage Above Threshold
      P1CB6-9E Drive Motor "A" Inverter Voltage Sensor (VH) Stuck On

      HINT: 

      • P0AA3-73 may be output as a result of the malfunction indicated by the DTCs above.
        1. The chart above is listed in inspection order of priority.
        2. Check DTCs that are output at the same time by following the listed order. (The main cause of the malfunction can be determined without performing unnecessary inspections.)

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    B 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2023 - ] 

    Result: 

    C 

    GO TO DTC CHART (MOTOR GENERATOR CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2023 - ] 

    Result: 

    A 

    See step  2

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

    Refer to PROCEDURE - 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 (FLOOR WIRE CONNECTOR) 

    See step  7

    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  10

    Result: 

    C 

    See step  9

    Result: 

    B 

    See step  8

  8. CONNECT SECURELY 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  10

  9. REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  10

  10. CHECK CONNECTOR CONNECTION CONDITION (NO. 1 TRACTION BATTERY DEVICE BOX CONNECTOR) 

    See step  10

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    See step  12

    Result: 

    NG 

    See step  11

  11. CONNECT SECURELY 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  12

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

    See step  12

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    See step  14

    Result: 

    NG 

    See step  13

  13. CONNECT SECURELY 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - NO. 1 TRACTION BATTERY DEVICE BOX) 
    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 service information because this may cause a malfunction.

    • Disconnect the No. 1 traction battery device box connector.
      GTY1239619Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Disconnect the hybrid vehicle control ECU assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition Result
      D44-27 (SMRG) - z15-1 (SMRG) Ignition switch off Below 1 Ω Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition Result
      D44-27 (SMRG) or z15-1 (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 assembly connector.
    • Reconnect the No. 1 traction battery device box connector.

    Result: 

    OK 

    See step  16

    Result: 

    NG 

    See step  15

  15. REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  16

  16. CHECK HARNESS AND CONNECTOR (NO. 1 TRACTION BATTERY DEVICE BOX - BODY GROUND) 

    See step  16

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    See step  18

    Result: 

    NG 

    See step  17

  17. REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  18

  18. INSPECT NO. 1 TRACTION BATTERY DEVICE BOX (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 service information because this may cause a malfunction.

    • Disconnect the No. 1 traction battery device box connector.
      GTY1239619Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    • Measure the resistance according to the value(s) in the table below.
      GTY1240867Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (No. 1 Traction Battery Device Box)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      z15-1 (SMRG) - z15-3 (GND) -40 to 80°C (-40 to 176°F) 19.5 to 59.0 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None.

    Result: 

    NG 

    See step  21

    Result: 

    OK 

    See step  19

  19. CHECK NO. 1 TRACTION BATTERY DEVICE BOX (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 service information because this may cause a malfunction.

    • Measure the resistance according to the value(s) in the table below.
      GTY1240747Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      e2-1 (CEI) - z16-1 (-) Ignition switch off 10 kΩ or higher

      HINT: 

      If a system main relay is stuck closed, inspect the No. 1 traction battery device box without removing it from the vehicle, in order to keep the relay closed.

      Result

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

    Post-procedure1

    • None.

    Result: 

    B 

    See step  22

    Result: 

    A 

    See step  20

  20. REPLACE NO. 1 TRACTION BATTERY DEVICE BOX 

    HINT: 

    Refer to REMOVAL [09/2023 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  24

  21. REPLACE NO. 1 TRACTION BATTERY DEVICE BOX 

    HINT: 

    Refer to REMOVAL [09/2023 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  24

  22. REPLACE NO. 1 TRACTION BATTERY DEVICE BOX 

    HINT: 

    Refer to REMOVAL [09/2023 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  23

  23. CLEAR DTC (HV) 

    See step  23

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  24

  24. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY (CHECK FOR NORMAL OPERATION) 

    See step  24

    Result

    Result Proceed to
    Difference between "Hybrid/EV Battery Voltage" and "VH-Voltage after Boosting" is always less than 40 V. A
    Difference between "Hybrid/EV Battery Voltage" and "VH-Voltage after Boosting" is 40 V or more. B

    Result: 

    A 

    END 

    Result: 

    B 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY AND NO. 1 TRACTION BATTERY DEVICE BOX 

    HYBRID VEHICLE CONTROL ECU ASSEMBLY:

    Refer to REMOVAL [09/2023 - 12/2023] , or refer to REMOVAL [12/2023 - ]

    NO. 1 TRACTION BATTERY DEVICE BOX:

    Refer to REMOVAL [09/2023 - ]

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