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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 85 (Hybrid Control System (2WD) - Diagnostic Codes (2 Of 7)) >> HYBRID CONTROL SYSTEM (for 2WD) >> DTC P0A93-00: Inverter "A" Cooling System Performance [10/2021 - 11/2023] >> Procedure

DTC P0A93-00: Inverter "A" Cooling System Performance [10/2021 - 11/2023]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK DTC OUTPUT (HYBRID CONTROL, MOTOR GENERATOR, ENGINE) 
    1. Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Powertrain > Motor Generator > Trouble Codes 

      Powertrain > Engine > Trouble Codes 

      Result

      Result Proceed to
      P0A93-00 only is output, or DTCs except the ones in the table below are also output. A
      DTCs of Hybrid Control System in the table below are output. B
      DTCs of Motor Generator Control System in the table below are output. C
      DTCs of SFI System in the table below are output. D
      TABLE 1

      Malfunction Content System Relevant DTC
      Insulation malfunction Hybrid Control System P1C7C-49 Hybrid/EV Battery Voltage System Isolation (A/C Area) Internal Electronic Failure
      P1C7D-49 Hybrid/EV Battery Voltage System Isolation (Hybrid/EV Battery Area) Internal Electronic Failure
      P1C7E-49 Hybrid/EV Battery Voltage System Isolation (Transaxle Area) Internal Electronic Failure
      P1C7F-49 Hybrid/EV Battery Voltage System Isolation (Direct Current Area) Internal Electronic Failure
      TABLE 2

      Malfunction Content System Relevant DTC
      Sensor and actuator circuit malfunction Hybrid Control System P0C73-96 Motor Electronics Coolant Pump "A" Component Internal Failure
      P314A-31 Motor Electronics Coolant Pump "A" No Signal
      Motor Generator Control System P0A00-11 Motor Electronics Coolant Temperature Sensor Circuit Short to Ground
      P0A00-15 Motor Electronics Coolant Temperature Sensor Circuit Short to Battery or Open
      System malfunction SFI System P059A-71 Active Grille Air Shutter "A" Actuator Stuck
      P059A-79 Active Grille Air Shutter "A" Mechanical Linkage Failure
      P05A2-12 Active Grille Air Shutter "A" Circuit Short to Battery
      P15AD-87 Active Grille Air Shutter "A" Missing Message

      HINT: 

      • P0A93-00 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.)
    2. Turn the ignition switch off.

    Result: 

    B 

    GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2021 - 11/2023] 

    Result: 

    C 

    GO TO DTC CHART (MOTOR GENERATOR CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2021 - 11/2023] 

    Result: 

    D 

    GO TO DTC CHART (SFI SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2021 - 10/2022]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2022 - 11/2023] 

    Result: 

    A 

    See step  2

  2. 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  3

  3. CHECK COOLING SYSTEM 

    Refer to Cooling System [10/2021 - 11/2023]

    HINT: 

    If the "Cooling System" inspection results are normal, perform the next step.

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    REPLACE HV COOLANT. Refer to  REPLACEMENT [12/2019 - ] 

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