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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 78 (Motor Generator Control System (AWD) - Diagnostic Codes (1 Of 5)) >> MOTOR GENERATOR CONTROL SYSTEM (for AWD) >> DTC P0A00-1C: Motor Electronics Coolant Temperature Sensor Circuit Voltage Out of Range [12/2019 - 11/2023] >> Procedure

DTC P0A00-1C: Motor Electronics Coolant Temperature Sensor Circuit Voltage Out of Range [12/2019 - 11/2023]: Procedure

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

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      P0A00-1C only is output, or DTCs except the ones in the table below are also output. A
      Any of the following DTCs are also output. B
      TABLE 1

      Malfunction Content Relevant DTC
      Insulation Malfunction 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
      P1C80-49 Hybrid/EV Battery Voltage System Isolation (Rear Motor Area) Internal Electronic Failure
      TABLE 2

      Malfunction Content Relevant DTC
      Sensor and actuator circuit malfunction P0C73-96 Motor Electronics Coolant Pump "A" Component Internal Failure
      P314A-31 Motor Electronics Coolant Pump "A" No Signal
      System malfunction P0A93-00 Inverter "A" Cooling System Performance

      HINT: 

      • P0A00-1C may be output as a result of the malfunctions 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 [12/2019 - 09/2020] , or refer to DIAGNOSTIC TROUBLE CODE CHART [09/2020 - 10/2021] , or refer to DIAGNOSTIC TROUBLE CODE CHART [10/2021 - 11/2023]

    Result: 

    A 

    See step  2

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

    See 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 [12/2019 - 10/2021] , or 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 INVERTER WITH CONVERTER ASSEMBLY 

    Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

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