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Home >> Toyota >> 2016 >> Highlander Hybrid Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 79 (Hybrid Control System (2GR-FXS) - Diagnostic Codes (3 Of 7)) >> Hybrid Control System >> DTC P0A93-346: Inverter Cooling System Performance [11/2016 - ] >> Procedure

DTC P0A93-346: Inverter Cooling System Performance [11/2016 - ]: Procedure

WARNING: This page is about a different car, the 2019 Toyota Highlander, 2018 Toyota Highlander, and 2017 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK VEHICLE CONDITION 
    1. Make sure that the front side of the radiator grille is not blocked with anything.
    2. Ask the customer if the front side of the radiator grille was blocked with anything.

      HINT: 

      If the radiator grille is blocked, the inverter coolant temperature will increase and this DTC may be stored.

    Result: 

    Is/was blocked. 

    IF EQUIPPED, EXPLAIN TO CUSTOMER THAT OPTIONAL COMPONENTS WILL BE REMOVED 

    Result: 

    Not blocked. 

    See step  2

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

      Powertrain > Hybrid Control > Trouble Codes 

      Relevant DTC
      P0A02-719 Motor Electronics Coolant Temperature Sensor Circuit Low
      P0A03-720 Motor Electronics Coolant Temperature Sensor Circuit High
      P0C73-776 Motor Electronics Coolant Pump "A" Control Performance
      P314A-828 Inverter Coolant Pump Speed Signal

      HINT: 

      P0A93-346 may be stored due to a malfunction which also causes DTCs in the preceding table to be stored. In this case, first troubleshoot the output DTCs in the preceding table. Then, perform a test to attempt to reproduce the problems, and check that no DTCs are output.

    5. Turn the power switch off.
    Result Proceed to
    P0A93-346 only is output, or DTCs except the ones in the chart above are also output. A
    Any of the above DTCs are also output (see chart above). B

    Result: 

    B 

    Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2016 - 10/2017]  or  DIAGNOSTIC TROUBLE CODE CHART [10/2017 - ] 

    Result: 

    A 

    See step  3

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

    Refer to PROCEDURE - Step 3

    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  4

  4. CHECK QUANTITY OF HV COOLANT 

    Refer to PROCEDURE - Step 3

    Result Proceed to
    No leaks are found and the HV coolant level in the inverter reserve tank assembly is above the low line. A
    No leaks are found and the HV coolant level in the inverter reserve tank assembly is below the low line. B
    HV coolant leaks are evident. C

    Result: 

    B 

    ADD HV COOLANT 

    Result: 

    C 

    INSPECT FOR HV COOLANT LEAK AND ADD HV COOLANT 

    Result: 

    A 

    See step  5

  5. CHECK COOLANT HOSE 

    Refer to PROCEDURE - Step 4

    Result: 

    NG 

    REPAIR OR REPLACE COOLANT HOSE 

    Result: 

    OK 

    See step  6

  6. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE ELECTRIC COOLING FAN) 

    Refer to PROCEDURE - Step 5

    Result: 

    NG 

    CHECK COOLING FAN SYSTEM. Refer to  Cooling Fan Circuit [11/2016 - ] 

    Result: 

    OK 

    See step  7

  7. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE (INVERTER) WATER PUMP) 
    NOTE:

    Be sure to perform the inspection with the auxiliary battery voltage at 11 V or more.

    HINT: 

    When the auxiliary battery voltage is low, the inverter water pump assembly may not operate.

    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain / Hybrid Control / Active Test / Activate the (Inverter) Water Pump.

      Powertrain > Hybrid Control > Active Test 

      Tester Display
      Activate the (Inverter) Water Pump
    4. Select "Inverter W/P Revolution" in the Data List.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Inverter W/P Revolution
    5. While performing the "Activate the (Inverter) Water Pump" Active Test, check "Inverter W/P Revolution" in the Data List.
      Tester Display Condition Specified Condition
      Inverter W/P Revolution Power switch on (IG) 3000 to 9300 rpm

      HINT: 

      • Perform the Active Test with the inverter coolant temperature between -15 and 65°C (5 to 149°F).
      • When the inverter water pump assembly is not operating, the Data List item "Inverter W/P Revolution" displays a value lower than 625 rpm.
    6. Turn the power switch off.

    Result: 

    NG 

    See step  12

    Result: 

    OK 

    See step  8

  8. READ VALUE USING TECHSTREAM (DATA LIST) 
    1. Turn the power switch off and leave the vehicle for at least 1 hour.
    2. Connect the Techstream to the DLC3.
    3. Turn the power switch on (IG).
    4. Enter the following menus: Powertrain / Hybrid Control / Data List / Inverter Coolant Water Temperature, Inverter Temp (MG2), Cnv Tmp (Upper), Cnv Temp (Lower), Inverter Temp (MG1).

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Inverter Coolant Water Temperature
      Inverter Temp (MG2)
      Cnv Tmp (Upper)
      Cnv Temp (Lower)
      Inverter Temp (MG1)
    5. Read the Data List.

      HINT: 

      The lower limit temperature that can be displayed for "Inverter Temp- (MG1)", "Inverter Temp- (MG2)", "Cnv Tmp (Upper)" and "Cnv Temp (Lower)" is 15°C (59°F). The lower limit temperature for "Inverter Coolant Water Temperature" is -40°C (-40°F). The "Inverter Coolant Water Temperature" value displayed on the Techstream may be lower than the others, but this is not a malfunction.

    6. Turn the power switch off.
    Result Proceed to
    Other than below. A
    "Inverter Coolant Water Temperature" value is higher than the displayed temperature of any other Data List item by 20°C (68°F) or more. B

    Result: 

    B 

    REPLACE INVERTER WITH CONVERTER ASSEMBLY. Refer to  COMPONENTS [11/2016 - ] 

    Result: 

    A 

    See step  9

  9. CHECK HV COOLANT (CHECK FOR CONDITIONS THAT MAY HAVE CAUSED FREEZING) 

    Refer to PROCEDURE - Step 6

    Result Proceed to
    Ambient Temperature value is below freezing temperature of the HV coolant. A
    Ambient Temperature value is above freezing temperature of the HV coolant. B

    Result: 

    B 

    See step  11

    Result: 

    A 

    See step  10

  10. REPLACE HV COOLANT 

    Refer to PROCEDURE - Step 7

    COMPLETED 

  11. REPLACE HV COOLANT 

    Refer to PROCEDURE - Step 7

    COMPLETED 

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

    Refer to PROCEDURE - Step 1

    Result: 

    NG 

    CONNECT SECURELY 

    Result: 

    OK 

    See step  13

  13. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WATER PUMP ASSEMBLY CONNECTOR) 

    Refer to PROCEDURE - Step 8

    Result: 

    NG 

    CONNECT SECURELY 

    Result: 

    OK 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - INVERTER WATER PUMP ASSEMBLY) 

    Refer to PROCEDURE - Step 9

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  15

  15. READ VALUE USING TECHSTREAM (INVERTER W/P REVOLUTION) 

    Refer to PROCEDURE - Step 10

    Result: 

    NG 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  COMPONENTS [11/2016 - ] 

    Result: 

    OK 

    See step  16

  16. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - INVERTER WATER PUMP ASSEMBLY) 

    Refer to PROCEDURE - Step 11

    Result: 

    NG 

    REPLACE INVERTER WATER PUMP ASSEMBLY. Refer to  COMPONENTS [11/2016 - ] 

    Result: 

    OK 

    See step  17

  17. CHECK HYBRID VEHICLE CONTROL ECU ASSEMBLY (CHECK WAVEFORM) 

    Refer to PROCEDURE - Step 12

    Result: 

    OK 

    REPLACE INVERTER WATER PUMP ASSEMBLY. Refer to  COMPONENTS [11/2016 - ] 

    Result: 

    NG 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  COMPONENTS [11/2016 - ] 

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