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Home >> Lexus >> 2009 >> LS 600hL >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Vehicle Control (Diagnostic Codes (P0A7A-324 - P1557-887)) >> Hybrid Control System >> DTC P0A93-346: Inverter Cooling System Performance >> Procedure

DTC P0A93-346: Inverter Cooling System Performance: Procedure

  1. CHECK DTC OUTPUT (HV) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
    4. Check if DTCs are output.

      Result

      Result Proceed to
      P0A93-346 only is output. A
      Any of the following DTCs are also output. B
      DTC No. Relevant Diagnosis
      P0A02-719 Motor Electronics Coolant Temperature Sensor Circuit Low
      P0A03-720 Motor Electronics Coolant Temperature Sensor Circuit High

      HINT: 

      P0A93-346 may be set due to a malfunction which also causes DTCs in the preceding table to be set. 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.

    B → See step   19 

    A: Go to next step 

  2. CHECK QUANTITY OF HV COOLANT. Refer to  PROCEDURE - Step 2 

    C → CHECK FOR COOLANT LEAKS AND ADD COOLANT 

    B → ADD HV COOLANT 

    A: Go to next step 

  3. CHECK COOLANT HOSE. Refer to  PROCEDURE - Step 3 

    NG → CORRECT THE PROBLEM 

    OK: Go to next step 

  4. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE WATER PUMP). Refer to  PROCEDURE - Step 4 

    NG → See step   9 

    OK: Go to next step 

  5. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE ELECTRIC COOLING FAN). Refer to  PROCEDURE - Step 5 

    NG → See step   20 

    OK: Go to next step 

  6. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR). Refer to  PROCEDURE - Step 6 

    NG → CONNECT SECURELY 

    OK: Go to next step 

  7. READ VALUE USING TECHSTREAM 
    1. Stop the engine and leave the vehicle for at least 1 hour.
    2. Select the following menu items: Powertrain / Hybrid Control / Data List / Inverter Coolant Water Temperature, Inverter Temp-(MG2), Converter Temperature, Inverter Temp-(MG1).
    3. Read the data list.

      Result

      Result Proceed to
      The difference between "Inverter Coolant Water Temperature" value and other temperatures selected in the list is at least 68°F (20°C). A
      The difference between "Inverter Coolant Water Temperature" value and other temperatures selected in the list is smaller than 68°F (20°C). B
      NOTE:

      The lower limit temperature that can be displayed for "Inverter Temp (MG1)", "Inverter Temp (MG2)" and "Converter Temperature" is 15°C. The lower limit temperature for "Inverter Coolant Water Temperature" is -50°C. The "Inverter Coolant Water Temperature" value displayed on the Techstream may be lower than the others, but this is not a malfunction.

    B → See step   22 

    A: Go to next step 

  8. INSPECT COOLING SYSTEM (FOR CLOGGING). Refer to  PROCEDURE - Step 7 

    NG → REPLACE MALFUNCTIONING PARTS 

    OK → See step   21 

  9. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE WATER PUMP). Refer to  PROCEDURE - Step 8 

    NG → See step   10 

    OK → ADD HV COOLANT 

  10. CHECK FUSE (INV W/P). Refer to  PROCEDURE - Step 9 

    NG → See step   15 

    OK: Go to next step 

  11. CHECK CONNECTOR CONNECTION CONDITION (WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY CONNECTOR). Refer to  PROCEDURE - Step 10 

    NG → CONNECT SECURELY 

    OK: Go to next step 

  12. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR). Refer to  PROCEDURE - Step 11 

    NG → CONNECT SECURELY 

    OK: Go to next step 

  13. CHECK HARNESS AND CONNECTOR (WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY). Refer to  PROCEDURE - Step 12 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  14. CHECK WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY. Refer to  PROCEDURE - Step 13 

    NG → See step   22 

    OK → See step   23 

  15. CHECK CONNECTOR CONNECTION CONDITION (WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY CONNECTOR). Refer to  PROCEDURE - Step 14 

    NG → CONNECT SECURELY 

    OK: Go to next step 

  16. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR). Refer to  PROCEDURE - Step 15 

    NG → CONNECT SECURELY 

    OK: Go to next step 

  17. CHECK HARNESS AND CONNECTOR (WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY). Refer to  PROCEDURE - Step 16 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  18. CHECK WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY. Refer to  PROCEDURE - Step 17 

    NG → See step   22 

    OK → See step   23 

  19. GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART 
  20. CHECK COOLING FAN SYSTEM. Refer to  Cooling Fan Circuit 
  21. REPLACE INVERTER WITH CONVERTER ASSEMBLY. Refer to  REMOVAL 
  22. REPLACE WATER PUMP WITH MOTOR AND BRACKET ASSEMBLY. Refer to  REMOVAL 
  23. REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL 
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