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Home >> Toyota >> 2012 >> Prius V >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System [Diagnostic Codes (P0A78-121 - P0AA1-233)] >> Hybrid Control System >> DTC P0A94-557: DC / DC Converter Performance >> Procedure

DTC P0A94-557: DC / DC Converter Performance: Procedure

  1. 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 if DTCs are output.

      Result

      Result Proceed to
      DTC P0A94-557 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, 286, 287, 306, 503, 504, 505, 506, 586, 806, 807, 808 Drive Motor "A" Inverter Performance
      P0A7A-122, 130, 322, 324, 325, 344, 517, 518, 809, 810, 811 Generator Inverter Performance
      P0A90-509 Drive Motor "A" Performance
      P0A92-521 Hybrid Generator Performance
      P0A94-172, 442, 547, 548, 549, 553, 554, 555, 556, 585, 587, 589, 590 DC / DC Converter Performance
      P0C73-776 Motor Electronics Coolant Pump "A" Control Performance
      P0C76-523 Hybrid Battery System Discharge Time Too Long
      P314A-828 Inverter Coolant Pump Speed Signal

      HINT: 

      • *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.
      • P0A94-557 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. After troubleshooting and repairing all output DTCs, be sure to replace the inverter with converter assembly.
    5. Turn the power switch off.

    B → See step   34 

    A: Go to next step 

  2. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR). Refer to  PROCEDURE - Step 4 

    NG → CONNECT SECURELY 

    OK: Go to next step 

  3. CHECK QUANTITY OF HV COOLANT. Refer to  PROCEDURE - Step 3 

    B → ADD HV COOLANT 

    C → INSPECT FOR COOLANT LEAK AND ADD COOLANT 

    A: Go to next step 

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

    NG → CORRECT THE PROBLEM 

    OK: Go to next step 

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

    NG → See step   35 

    OK: Go to next step 

  6. CHECK HV COOLANT (CHECK FOR CONDITIONS THAT MAY HAVE CAUSED FREEZING). Refer to  PROCEDURE - Step 17 

    B → See step   21 

    A: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RESOLVER). Refer to  PROCEDURE - Step 3 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  8. CHECK GENERATOR RESOLVER. Refer to  PROCEDURE - Step 4 

    NG → See step   23 

    OK: Go to next step 

  9. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER). Refer to  PROCEDURE - Step 5 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  10. CHECK MOTOR RESOLVER. Refer to  PROCEDURE - Step 6 

    NG → See step   25 

    OK: Go to next step 

  11. CHECK INVERTER WITH CONVERTER ASSEMBLY (GENERATOR CABLE CONNECTION CONDITION). Refer to  PROCEDURE - Step 9 

    B → REPLACE MALFUNCTIONING PARTS 

    C → CONNECT SECURELY 

    A: Go to next step 

  12. CHECK INVERTER WITH CONVERTER ASSEMBLY (MOTOR CABLE CONNECTION CONDITION). Refer to  PROCEDURE - Step 10 

    B → REPLACE MALFUNCTIONING PARTS 

    C → CONNECT SECURELY 

    A: Go to next step 

  13. CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (MG1). Refer to  PROCEDURE - Step 11 

    NG → See step   27 

    OK: Go to next step 

  14. CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (MG2). Refer to  PROCEDURE - Step 12 

    NG → See step   29 

    OK: Go to next step 

  15. CHECK FUSE (PCU). Refer to  PROCEDURE - Step 13 

    NG → See step   31 

    OK: Go to next step 

  16. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY POWER SOURCE CIRCUIT). Refer to  PROCEDURE - Step 14 

    NG → REPAIR OR REPLACE POWER SOURCE CIRCUIT 

    OK: Go to next step 

  17. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INVERTER WITH CONVERTER). Refer to  PROCEDURE - Step 15 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  18. CHECK POWER MANAGEMENT CONTROL ECU. Refer to  PROCEDURE - Step 16 

    NG → See step   37 

    OK: Go to next step 

  19. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR). Refer to  PROCEDURE - Step 7 

    NG → CONNECT SECURELY 

    OK: Go to next step 

  20. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR). Refer to  PROCEDURE - Step 8 

    NG → CONNECT SECURELY 

    OK → See step   38 

  21. REPLACE HV COOLANT. Refer to  PROCEDURE - Step 7 

    NEXT: Go to next step 

  22. CHECK INVERTER WATER PUMP ASSEMBLY. Refer to  PROCEDURE - Step 8 

    NG → See step   39 

    OK → COMPLETED 

  23. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR). Refer to  PROCEDURE - Step 9 

    NG → CONNECT SECURELY 

    OK: Go to next step 

  24. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RESOLVER). Refer to  PROCEDURE - Step 10 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   36 

  25. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR). Refer to  PROCEDURE - Step 11 

    NG → CONNECT SECURELY 

    OK: Go to next step 

  26. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER). Refer to  PROCEDURE - Step 12 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   36 

  27. CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (GENERATOR CABLE CONNECTION CONDITION). Refer to  PROCEDURE - Step 26 

    B → REPLACE MALFUNCTIONING PARTS 

    C → CONNECT SECURELY 

    A: Go to next step 

  28. CHECK GENERATOR CABLE. Refer to  PROCEDURE - Step 27 

    NG → See step   40 

    OK → See step   36 

  29. CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (MOTOR CABLE CONNECTION CONDITION). Refer to  PROCEDURE - Step 28 

    B → REPLACE MALFUNCTIONING PARTS 

    C → CONNECT SECURELY 

    A: Go to next step 

  30. CHECK MOTOR CABLE. Refer to  PROCEDURE - Step 29 

    NG → See step   41 

    OK → See step   36 

  31. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - PCU FUSE). Refer to  PROCEDURE - Step 23 

    NG → See step   33 

    OK: Go to next step 

  32. REPLACE INVERTER WITH CONVERTER ASSEMBLY 

    Refer to COMPONENTS

    NEXT → REPLACE FUSE (PCU) 

  33. REPAIR OR REPLACE HARNESS OR CONNECTOR 

    NEXT → REPLACE FUSE (PCU) 

  34. GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART 
  35. CHECK COOLING FAN SYSTEM. Refer to  Cooling Fan Circuit 
  36. REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY. Refer to  COMPONENTS 
  37. REPLACE POWER MANAGEMENT CONTROL ECU. Refer to  COMPONENTS 
  38. REPLACE INVERTER WITH CONVERTER ASSEMBLY. Refer to  COMPONENTS 
  39. REPLACE INVERTER WATER PUMP ASSEMBLY. Refer to  COMPONENTS 
  40. REPLACE GENERATOR CABLE. Refer to  COMPONENTS 
  41. REPLACE MOTOR CABLE. Refer to  COMPONENTS 
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