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Home >> Scion >> 2013 >> iQ EV >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System (Diagnostic Codes P0A90-509 - P3004-133) (Electric) >> Hybrid Control System >> DTC P0A94-127: Inverter Performance >> Procedure

DTC P0A94-127: Inverter Performance: Procedure

  1. CHECK DTC OUTPUT (EV BATTERY) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain / EV Battery / Trouble Codes.
    4. Check if DTCs related to the EV battery system are output.

      Result

      Result Proceed to
      DTCs related to EV Battery are not output, or DTCs other than the ones in the table below are also output. A
      Any of the following DTCs are also output. B
      DTC No. Relevant Diagnosis
      P1A61-123 EV Battery No. 1 Cell Low Voltage Stack "B"
      P1A64-123 EV Battery No. 1 Cell Low Voltage Stack "C"
      P1A71-123 EV Battery No. 2 Cell Low Voltage Stack "B"
      P1A74-123 EV Battery No. 2 Cell Low Voltage Stack "C"
      P31AB-123 EV Battery No. 1 Cell Low Voltage Stack "A"
      P31AE-123 EV Battery No. 2 Cell Low Voltage Stack "A"

      HINT: 

      P0A94-127 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.

    5. Turn the power switch off.

    B → See step   30 

    A: Go to next step 

  2. CHECK DTC OUTPUT (EV) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Enter the following menus: Powertrain / EV / Trouble Codes.
    4. Check if DTCs related to the EV control system are output.

      Result

      Result Proceed to
      DTC P0A94-127 only is output, or DTCs other than the ones in the table below are also output. A
      Any of the following DTCs including pending DTCs are also output. B
      DTC No. Relevant Diagnosis
      P0A0D-350, 351 High Voltage System Inter-Lock Circuit High
      P0A1A (all INF codes)*1 Generator Control Module
      P0A1B (all INF codes)*1 Drive Motor "A" Control Module
      P0A1D (all INF codes)*1 EV 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
      P0A60 (all INF codes)*1 Drive Motor "A" Phase V Current
      P0A63 (all INF codes)*1 Drive Motor "A" Phase W Current
      P0A78-113, 128, 266, 267, 284, 286, 287, 306, 505, 506, 586, 806, 807, 808 Drive Motor "A" Inverter Performance
      P0A90-509 Drive Motor "A" Performance
      P0A94-585, 587, 589, 590 Inverter Performance
      P0AA6-526 EV Battery Voltage System Isolation Fault
      P0ADB-227 EV Battery No. 1 Positive Contactor Control Circuit Low
      P0ADC-226 EV Battery No. 1 Positive Contactor Control Circuit High
      P0ADF-229 EV Battery Negative Contactor Control Circuit Low
      P0AE0-228 EV Battery Negative Contactor Control Circuit High
      P0C76-523 EV Battery System Discharge Time Too Long
      P3004-131, 803 High Voltage Power Resource
      P3322-368 EV Battery No. 2 Positive Contactor Control Circuit Low
      P3323-367 EV Battery No. 2 Positive Contactor Control Circuit High

      HINT: 

      • *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.
      • P0A94-127 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.
    5. Turn the power switch off.

    B → See step   25 

    A: Go to next step 

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

    NG → CONNECT SECURELY 

    OK: Go to next step 

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

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. CHECK MOTOR RESOLVER. Refer to  PROCEDURE - Step 4 

    NG → See step   17 

    OK: Go to next step 

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

    B → REPLACE MALFUNCTIONING PARTS 

    C → CONNECT SECURELY 

    A: Go to next step 

  7. CHECK EV TRANSAXLE WITH MOTOR ASSEMBLY. Refer to  PROCEDURE - Step 7 

    NG → See step   19 

    OK: Go to next step 

  8. CHECK INVERTER WITH CONVERTER ASSEMBLY (HIGH VOLTAGE CONNECTOR CONNECTION CONDITION). Refer to  PROCEDURE - Step 8 

    B → REPLACE MALFUNCTIONING PARTS 

    C → CONNECT SECURELY 

    A: Go to next step 

  9. CHECK SERVICE PLUG GRIP (CONNECTION CONDITION). Refer to  PROCEDURE - Step 9 

    NG → See step   27 

    OK: Go to next step 

  10. INSPECT SERVICE PLUG GRIP. Refer to  PROCEDURE - Step 10 

    NG → See step   27 

    OK: Go to next step 

  11. CHECK FRAME WIRE. Refer to  PROCEDURE - Step 11 

    NG → See step   28 

    OK: Go to next step 

  12. CHECK FUSE (PCU). Refer to  PROCEDURE - Step 8 

    NG → See step   21 

    OK: Go to next step 

  13. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY POWER SOURCE CIRCUIT). Refer to  PROCEDURE - Step 9 

    NG → REPAIR OR REPLACE POWER SOURCE CIRCUIT 

    OK: Go to next step 

  14. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY). Refer to  PROCEDURE - Step 10 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  15. CHECK POWER MANAGEMENT CONTROL ECU. Refer to  PROCEDURE - Step 11 

    NG → See step   24 

    OK: Go to next step 

  16. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR). Refer to  PROCEDURE - Step 5 

    NG → CONNECT SECURELY 

    OK → See step   31 

  17. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR). Refer to  PROCEDURE - Step 6 

    NG → CONNECT SECURELY 

    OK: Go to next step 

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

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   26 

  19. CHECK EV TRANSAXLE WITH MOTOR ASSEMBLY (MOTOR CABLE CONNECTION CONDITION). Refer to  PROCEDURE - Step 18 

    B → REPLACE MALFUNCTIONING PARTS 

    C → CONNECT SECURELY 

    A: Go to next step 

  20. CHECK MOTOR CABLE. Refer to  PROCEDURE - Step 19 

    NG → See step   29 

    OK → See step   26 

  21. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - PCU FUSE). Refer to  PROCEDURE - Step 15 

    NG → See step   23 

    OK: Go to next step 

  22. REPLACE INVERTER WITH CONVERTER ASSEMBLY 

    Refer to COMPONENTS

    NEXT → REPLACE FUSE (PCU) 

  23. REPAIR OR REPLACE HARNESS OR CONNECTOR 

    NEXT → REPLACE FUSE (PCU) 

  24. POWER MANAGEMENT CONTROL ECU MUST BE REPLACED 
    1. Even though it has been determined that the power management control ECU needs to be replaced, make sure to inspect the voltage difference between No. 1 EV battery and No. 2 EV battery before replacing it.

    NEXT → See step   32 

  25. GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART 
  26. REPLACE EV TRANSAXLE WITH MOTOR ASSEMBLY. Refer to  COMPONENTS 
  27. REPLACE SERVICE PLUG GRIP. Refer to  COMPONENTS 
  28. REPLACE FRAME WIRE. Refer to  COMPONENTS 
  29. REPLACE MOTOR CABLE. Refer to  COMPONENTS 
  30. GO TO DTC CHART (HYBRID BATTERY SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART 
  31. REPLACE INVERTER WITH CONVERTER ASSEMBLY. Refer to  COMPONENTS 
  32. GO TO NO. 1 EV BATTERY - NO. 2 EV BATTERY VOLTAGE DIFFERENCE INSPECTION. Refer to  No. 1 EV Battery - No. 2 EV Battery Voltage Difference Inspection 
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