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Home >> Lexus >> 2009 >> LS 600hL >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Vehicle Control (Diagnostic Codes (P0A10-592 - P0A7A-322)) >> Hybrid Control System >> DTC P0A78-286: Drive Motor "A" Inverter Performance >> Procedure

DTC P0A78-286: Drive Motor "A" Inverter 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
      P3246-202 is not output. A
      P3246-202 is also output. B

    B → See step   24 

    A: Go to next step 

  2. 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
      P0A78-286 only is output. A
      Any of the following DTCs are also output. B
      DTC No. Relevant Diagnosis
      P0A1A (all INF codes) *1 Generator Control Module
      P0A1B (all INF codes) *1 Drive Motor "A" Control Module
      P0A1D (all INF codes) *1 Hybrid Powertrain Control Module
      P0A3F-243 Drive Motor "A" Position Sensor Circuit
      P0A40-500 Drive Motor "A" Position Sensor Circuit Range / Performance
      P0A41-245 Drive Motor "A" Position Sensor Circuit Low
      P0A4B-253 Generator Position Sensor Circuit
      P0A4C-513 Generator Position Sensor Circuit Range / Performance
      P0A4D-255 Generator Position Sensor Circuit Low
      P0A60 (all INF codes) *1 Drive Motor "A" Phase V Current
      P0A63 (all INF codes) *1 Drive Motor "A" Phase W Current
      P0A72 (all INF codes) *1 Generator Phase V Current
      P0A75 (all INF codes) *1 Generator Phase W Current
      P0A78-113, 128, 266, 267, 279, 284, 287, 306, 503, 504, 505, 506, 523, 586, 806, 807, 808 Drive Motor "A" Inverter Performance
      P0A7A-122, 130, 322, 325, 344, 517, 518, 809, 810, 811 Generator Inverter Performance
      P0A90-509 Drive Motor "A" Performance
      P0A92-521 Hybrid Generator Performance
      P0A94-442, 547, 548, 549, 554, 555, 556, 585, 587, 589, 590 DC / DC Converter Performance

      HINT: 

      • *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic flowchart.
      • P0A78-286 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. After troubleshooting and repairing all output DTCs, be sure to replace the inverter with converter assembly.

    B → See step   19 

    A: Go to next step 

  3. 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 

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

    NG → CORRECT THE PROBLEM 

    OK: Go to next step 

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

    NG → See step   9 

    OK: Go to next step 

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

    NG → See step   20 

    OK: Go to next step 

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

    NG → CONNECT SECURELY 

    OK: 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 
  24. GO TO DTC CHART. Refer to  DTC P3246-202: Short in Drive Motor "A" Inverter Circuit 
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