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Home >> Lexus >> 2020 >> UX 200 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Motor Generator Control System (Diagnostic Codes) (2 Of 3)) >> Motor Generator Control System >> DTC P0A94-9E: DC/DC Converter Stuck On; DTC P0D3319: DC/DC Converter Circuit Current Above Threshold [10/2018 - ] >> Procedure

DTC P0A94-9E: DC/DC Converter Stuck On; DTC P0D3319: DC/DC Converter Circuit Current Above Threshold [10/2018 - ]: Procedure

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  1. CHECK DTC OUTPUT 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain / Hybrid Control and Motor Generator / Trouble Codes.
    4. Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Powertrain > Motor Generator > Trouble Codes 

      Result

      Result Proceed to
      P0A949E or P0D3319 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
      TABLE 1

      Malfunction Content System Relevant DTC
      Insulation Malfunction Hybrid control system P1C7C49 Hybrid/EV Battery Voltage System Isolation (A/C Area) Internal Electronic Failure
      P1C7D49 Hybrid/EV Battery Voltage System Isolation (Hybrid/EV Battery Area) Internal Electronic Failure
      P1C7E49 Hybrid/EV Battery Voltage System Isolation (Transaxle Area) Internal Electronic Failure
      P1C7F49 Hybrid/EV Battery Voltage System Isolation (Direct Current Area) Internal Electronic Failure
      P1C8049 Hybrid/EV Battery Voltage System Isolation (Rear Motor Area) Internal Electronic Failure
      System Main Relay or High Voltage Circuit Malfunction Hybrid control system P0AD911 Hybrid/EV Battery Positive Contactor Circuit Short to Ground
      P0AD915 Hybrid/EV Battery Positive Contactor Circuit Short to Battery or Open
      P0ADD11 Hybrid/EV Battery Negative Contactor Circuit Short to Ground
      P0ADD15 Hybrid/EV Battery Negative Contactor Circuit Short to Battery or Open
      P1C8449 High Voltage Power Resource Circuit Short during Ready ON
      HV Battery Malfunction Hybrid control system P0AFC16 Hybrid/EV Battery Sensor Module Circuit Voltage Below Threshold
      P0AFC96 Hybrid/EV Battery Sensor Module Component Internal Failure
      P1CBE1E Hybrid/EV Battery Block 1 (Voltage Difference) Circuit Resistance Out of Range
      P1CBF1E Hybrid/EV Battery Block 2 (Voltage Difference) Circuit Resistance Out of Range
      P1CC01E Hybrid/EV Battery Block 3 (Voltage Difference) Circuit Resistance Out of Range
      P1CC11E Hybrid/EV Battery Block 4 (Voltage Difference) Circuit Resistance Out of Range
      P1CC21E Hybrid/EV Battery Block 5 (Voltage Difference) Circuit Resistance Out of Range
      P1CC31E Hybrid/EV Battery Block 6 (Voltage Difference) Circuit Resistance Out of Range
      P1CC41E Hybrid/EV Battery Block 7 (Voltage Difference) Circuit Resistance Out of Range
      P1CC51E Hybrid/EV Battery Block 8 (Voltage Difference) Circuit Resistance Out of Range
      P1CC61E Hybrid/EV Battery Block 9 (Voltage Difference) Circuit Resistance Out of Range
      P1CC71E Hybrid/EV Battery Block 10 (Voltage Difference) Circuit Resistance Out of Range
      P301100 Hybrid/EV Battery Block 1 (Internal Resistance Difference) Circuit Resistance Out of Range (Extreme)
      P301200 Hybrid/EV Battery Block 2 (Internal Resistance Difference) Circuit Resistance Out of Range (Extreme)
      P301300 Hybrid/EV Battery Block 3 (Internal Resistance Difference) Circuit Resistance Out of Range (Extreme)
      P301400 Hybrid/EV Battery Block 4 (Internal Resistance Difference) Circuit Resistance Out of Range (Extreme)
      P301500 Hybrid/EV Battery Block 5 (Internal Resistance Difference) Circuit Resistance Out of Range (Extreme)
      P301600 Hybrid/EV Battery Block 6 (Internal Resistance Difference) Circuit Resistance Out of Range (Extreme)
      P301700 Hybrid/EV Battery Block 7 (Internal Resistance Difference) Circuit Resistance Out of Range (Extreme)
      P301800 Hybrid/EV Battery Block 8 (Internal Resistance Difference) Circuit Resistance Out of Range (Extreme)
      P301900 Hybrid/EV Battery Block 9 (Internal Resistance Difference) Circuit Resistance Out of Range (Extreme)
      P302000 Hybrid/EV Battery Block 10 (Internal Resistance Difference) Circuit Resistance Out of Range (Extreme)
      U029A87 Lost Communication with Hybrid/EV Battery Sensor Module Missing Message
      TABLE 2

      Malfunction Content System Relevant DTC
      Microcomputer malfunction Motor generator control system P0A1A47 Generator Control Module Watchdog / Safety μC Failure
      P0A1A49 Generator Control Module Internal Electronic Failure
      P0A1B1F Generator Control Module Circuit Intermittent
      P1C2A1C Generator A/D Converter Circuit Circuit Voltage Out of Range
      P1C2A49 Generator A/D Converter Circuit Internal Electronic Failure
      P1C2B1C Drive Motor "A" Control Module A/D Converter Circuit Voltage Out of Range
      P1C2B49 Drive Motor "A" Control Module A/D Converter Circuit Internal Electronic Failure
      P313383 Communication Error from Generator to Drive Motor "A" Value of Signal Protection Calculation Incorrect
      P313386 Communication Error from Generator to Drive Motor "A" Signal Invalid
      P313387 Communication Error from Generator to Drive Motor "A" Missing Message
      P313483 Communication Error from Drive Motor "A" to Generator Value of Signal Protection Calculation Incorrect
      P313486 Communication Error from Drive Motor "A" to Generator Signal Invalid
      P313487 Communication Error from Drive Motor "A" to Generator Missing Message
      Hybrid control system P0A1B49 Drive Motor "A" Control Module Internal Electronic Failure
      Power source circuit malfunction Motor generator control system P06B01C Generator Control Module Position Sensor REF Power Source Circuit Voltage Out of Range
      P06D61C Generator Control Module Offset Power Circuit Voltage Out of Range
      Communication malfunction Motor generator control system P312487 Lost Communication between Drive Motor "A" and HV ECU Missing Message
      Hybrid control system P312387 Lost Communication with Drive Motor Control Module "A" from Hybrid/EV Control Module Missing Message
      Sensor and actuator circuit malfunction Motor generator control system P0A3F16 Drive Motor "A" Position Sensor Circuit Voltage Below Threshold
      P0A3F21 Drive Motor "A" Position Sensor Signal Amplitude < Minimum
      P0A3F22 Drive Motor "A" Position Sensor Signal Amplitude > Maximum
      P0A4B16 Generator Position Sensor Circuit Voltage Below Threshold
      P0A4B21 Generator Position Sensor Signal Amplitude < Minimum
      P0A4B22 Generator Position Sensor Signal Amplitude > Maximum
      P0A6012 Drive Motor "A" Phase V Current (High Resolution) Circuit Short to Battery
      P0A6014 Drive Motor "A" Phase V Current (High Resolution) Circuit Short to Ground or Open
      P0A601C Drive Motor "A" Phase V Current (High Resolution) Circuit Voltage Out of Range
      P0A6312 Drive Motor "A" Phase W Current (High Resolution) Circuit Short to Battery
      P0A6314 Drive Motor "A" Phase W Current (High Resolution) Circuit Short to Ground or Open
      P0A631C Drive Motor "A" Phase W Current (High Resolution) Circuit Voltage Out of Range
      P0BE512 Drive Motor "A" Phase U Current Sensor Circuit Short to Battery
      P0BE514 Drive Motor "A" Phase U Current Sensor Circuit Short to Ground or Open
      P0BE528 Drive Motor "A" Phase U Current Sensor Signal Bias Level Out of Range / Zero Adjustment Failure
      P0BE912 Drive Motor "A" Phase V Current Sensor Circuit Short to Battery
      P0BE914 Drive Motor "A" Phase V Current Sensor Circuit Short to Ground or Open
      P0BE928 Drive Motor "A" Phase V Current Sensor Signal Bias Level Out of Range / Zero Adjustment Failure
      P0BED12 Drive Motor "A" Phase W Current Sensor Circuit Short to Battery
      P0BED14 Drive Motor "A" Phase W Current Sensor Circuit Short to Ground or Open
      P0BED28 Drive Motor "A" Phase W Current Sensor Signal Bias Level Out of Range / Zero Adjustment Failure
      P0BFD62 Drive Motor "A" Phase U-V-W Current Sensor Signal Compare Failure
      P0C5013 Drive Motor "A" Position Sensor Circuit "A" Circuit Open
      P0C5016 Drive Motor "A" Position Sensor Circuit "A" Circuit Voltage Below Threshold
      P0C5017 Drive Motor "A" Position Sensor Circuit "A" Circuit Voltage Above Threshold
      P0C5A13 Drive Motor "A" Position Sensor Circuit "B" Circuit Open
      P0C5A16 Drive Motor "A" Position Sensor Circuit "B" Circuit Voltage Below Threshold
      P0C5A17 Drive Motor "A" Position Sensor Circuit "B" Circuit Voltage Above Threshold
      P0C6413 Generator Position Sensor Circuit "A" Circuit Open
      P0C6416 Generator Position Sensor Circuit "A" Circuit Voltage Below Threshold
      Sensor and actuator circuit malfunction Motor generator control system P0C6417 Generator Position Sensor Circuit "A" Circuit Voltage Above Threshold
      P0C6913 Generator Position Sensor Circuit "B" Circuit Open
      P0C6916 Generator Position Sensor Circuit "B" Circuit Voltage Below Threshold
      P0C6917 Generator Position Sensor Circuit "B" Circuit Voltage Above Threshold
      P0D2D16 Drive Motor "A" Inverter Voltage Sensor (VH) Circuit Voltage Below Threshold
      P0D2D17 Drive Motor "A" Inverter Voltage Sensor (VH) Circuit Voltage Above Threshold
      P0DFA62 Generator Phase U-V-W Current Sensor Signal Compare Failure
      P0E0012 Generator Phase U Current Sensor Circuit Short to Battery
      P0E0014 Generator Phase U Current Sensor Circuit Short to Ground or Open
      P0E0028 Generator Phase U Current Sensor Signal Bias Level Out of Range / Zero Adjustment Failure
      P0E0412 Generator Phase V Current Sensor Circuit Short to Battery
      P0E0414 Generator Phase V Current Sensor Circuit Short to Ground or Open
      P0E0428 Generator Phase V Current Sensor Signal Bias Level Out of Range / Zero Adjustment Failure
      P0E0812 Generator Phase W Current Sensor Circuit Short to Battery
      P0E0814 Generator Phase W Current Sensor Circuit Short to Ground or Open
      P0E0828 Generator Phase W Current Sensor Signal Bias Level Out of Range / Zero Adjustment Failure
      P0E3116 DC/DC Converter Voltage Sensor "A" (VL) Circuit Voltage Below Threshold
      P0E3117 DC/DC Converter Voltage Sensor "A" (VL) Circuit Voltage Above Threshold
      P0E5111 DC/DC Converter Current Sensor Circuit Short to Ground
      P0E5115 DC/DC Converter Current Sensor Circuit Short to Battery or Open
      P0E5128 DC/DC Converter Current Sensor Signal Bias Level Out of Range / Zero Adjustment Failure
      P1CFF62 Hybrid/EV Battery Current/DC/DC Converter Current Signal Compare Failure
      P1CAC49 Generator Position Sensor Internal Electronic Failure
      P1CAD49 Drive Motor "A" Position Sensor Internal Electronic Failure
      P1CAF38 Generator Position Sensor REF Signal Cycle Malfunction Signal Frequency Incorrect
      P1CB038 Drive Motor "A" Position Sensor REF Signal Frequency Incorrect
      Hybrid control system P0C7600 Hybrid/EV Battery System Discharge Time Too Long
      P0D2D1C Drive Motor "A" Inverter after Boosting Voltage Sensor Circuit Voltage Out of Range
      P0E311C Drive Motor "A" Inverter before Boosting Voltage Sensor Circuit Voltage Out of Range
      System malfunction Motor generator control system P0A9000 Drive Motor "A" Performance
      P0A9200 Hybrid Generator Performance
      P0BFF1D Drive Motor "A" Circuit Current Out of Range
      P0C1900 Drive Motor "A" Execution Torque Performance
      P0CA300 DC/DC Converter Step Up Voltage Performance
      P0E7100 Generator Execution Torque Performance
      P1CA51D Hybrid Generator Circuit Current Out of Range
      P314F1F DC/DC Converter Voltage Sensor "A" (VL) Circuit Intermittent
      P31531D DC/DC Converter Current Sensor Circuit Current Out of Range
      Hybrid control system P0A9300 Inverter "A" Cooling System
      P0AA649 Hybrid/EV Battery Voltage System Isolation Internal Electronic Failure
      P0C7396 Motor Electronics Coolant Pump "A" Component Internal Failure
      P314A31 Motor Electronics Coolant Pump "A" No Signal
      TABLE 3

      Relevant DTC
      P0A3F1F Drive Motor "A" Position Sensor Circuit Intermittent
      P0A4B1F Generator Position Sensor Circuit Intermittent
      P0A601F Drive Motor "A" Phase V Current (High Resolution) Circuit Intermittent
      P0A631F Drive Motor "A" Phase W Current (High Resolution) Circuit Intermittent
      P0C501F Drive Motor "A" Position Sensor Circuit "A" Circuit Intermittent
      P0C5A1F Drive Motor "A" Position Sensor Circuit "B" Circuit Intermittent
      P0C641F Generator Position Sensor Circuit "A" Circuit Intermittent
      P0C691F Generator Position Sensor Circuit "B" Circuit Intermittent
      P0D2D1F Drive Motor "A" Inverter Voltage Sensor (VH) Circuit Intermittent
      P0E311F DC/DC Converter Voltage Sensor "A" (VL) Circuit Intermittent
      P1C601F Generator Control Module Position Sensor REF Power Source Circuit Intermittent
      P1C621F Generator Control Module Offset Power Circuit Intermittent
      P1C641F Generator Control Module Circuit Intermittent
      P1C651F Generator Control Module Circuit Intermittent
      P1C671F Drive Motor "A" Phase U-V-W Current Sensor Circuit Intermittent
      P1C691F Generator Phase U-V-W Current Sensor Circuit Intermittent
      P31241F Lost Communication between Drive Motor "A" and HV ECU Circuit Intermittent

      HINT: 

      • P0A949E or P0D3319 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.)
      • If DTC P0A949E is output, replace the inverter with converter assembly after completing repairs.
    5. Turn the power switch off.

    Result: 

    B 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2018 - ] 

    Result: 

    C 

    GO TO DTC CHART (MOTOR GENERATOR CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2018 - ] 

    Result: 

    A 

    See step  2

  2. CHECK FREEZE FRAME DATA AND DIAGNOSIS RELATED INFORMATION 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain / Motor Generator / Utility / Diagnosis Related Information.

      Powertrain > Motor Generator > Utility 

      Tester Display
      Diagnosis Related Information
    4. Enter the following menus: Powertrain / Motor Generator / Trouble Codes.

      Powertrain > Motor Generator > Trouble Codes 

    5. Read the diagnosis related information and freeze frame data of DTC P0A949E or P0D3319.

      Result

      Result Proceed to
      DTC P312487 is listed in Diagnosis Related Information. A
      DTC P312487 is not listed in Diagnosis Related Information and the value of freeze frame data item Emergency Shutdown Signal is ON. B
      Other than above C
    6. Turn the power switch off.

    Result: 

    A 

    GO TO DTC CHART (P312487). Refer to  DTC P3124-1F: Lost Communication between Drive Motor "A" and HV ECU Circuit Intermittent; DTC P312487: Lost Communication between Drive Motor "A" and HV ECU Missing Message [10/2018 - ] 

    Result: 

    B 

    GO TO DTC CHART (P321E9F). Refer to  DTC P321E-9F: Motor/Generator Shutdown Signal Stuck Off [10/2018 - ] 

    Result: 

    C 

    See step  3

  3. CHECK FREEZE FRAME DATA 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain / Motor Generator / Trouble Codes.

      Powertrain > Motor Generator > Trouble Codes 

    4. Read the freeze frame data of DTC P0A949E or P0D3319.

      Result

      Result Proceed to
      Boosting Converter Temperature (Upper) and Boosting Converter Temperature 1 (Lower) is 120°C or more A
      Other than above B
    5. Turn the power switch off.

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  4

  4. CHECK COOLING SYSTEM 

    Refer to Cooling System [10/2018 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  5

  5. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) 

    Refer to PROCEDURE - Step 3

    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: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  6

  6. CHECK GENERATOR RESOLVER CIRCUIT 

    Refer to Generator Resolver Circuit [10/2018 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  7

  7. CHECK MOTOR RESOLVER CIRCUIT 

    Refer to Motor Resolver Circuit [10/2018 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  8

  8. CHECK GENERATOR HIGH-VOLTAGE CIRCUIT 

    Refer to Generator High-voltage Circuit [10/2018 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  9

  9. CHECK MOTOR HIGH-VOLTAGE CIRCUIT 

    Refer to Motor High-voltage Circuit [10/2018 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  10

  10. CHECK INVERTER LOW-VOLTAGE CIRCUIT 

    Refer to Inverter Low-voltage Circuit [10/2018 - ]

    HINT: 

    If the "Inverter Low-voltage Circuit" inspection results are normal, perform the next step.

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  11

  11. CHECK FREEZE FRAME DATA 
    1. Read the freeze frame data for DTC P0A949E or DTC P0D3319.
      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
      "Inverter Input Current" is less than 50 A. A
      "Inverter Input Current" is 50 A or more. B
    2. Turn the power switch off.

    Result: 

    A 

    REPLACE INVERTER WITH CONVERTER ASSEMBLY. Refer to  REMOVAL [10/2018 - 07/2022]  Refer to  REMOVAL [07/2022 - ] 

    Result: 

    B 

    REPLACE INVERTER WITH CONVERTER ASSEMBLY, HV BATTERY JUNCTION BLOCK ASSEMBLY AND BATTERY TERMINAL BLOCK 

    INVERTER WITH CONVERTER ASSEMBLY: Refer to REMOVAL [10/2018 - 07/2022] Refer to REMOVAL [07/2022 - ]

    HV BATTERY JUNCTION BLOCK ASSEMBLY: Refer to REMOVAL [10/2018 - 07/2022] Refer to REMOVAL [07/2022 - ]

    BATTERY TERMINAL BLOCK: Refer to REMOVAL [10/2018 - 07/2022] Refer to REMOVAL [07/2022 - ]

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