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Home >> Scion >> 2014 >> iQ EV >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control System (Diagnostic Codes P0516-769 - P0A90-251) (Electric) >> Hybrid Control System >> DTC P0A78-128: Drive Motor "A" Inverter Performance >> Procedure

DTC P0A78-128: Drive Motor "A" Inverter Performance: Procedure

  1. 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
      P0A78-202 is not output. A
      P0A78-202 is also output. B
      NOTE:
      • If P0A78-202 is output, troubleshoot it first. After completing the troubleshooting for P0A78-202, return to perform troubleshooting for this DTC.
      • Parts repaired or replaced during troubleshooting for P0A78-202 do not need to be re-inspected in this diagnosis procedure.
    5. Turn the power switch off.

    B → See step   21 

    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.

      HINT: 

      • If P0A78-202 was not output in step 1 of this diagnosis procedure, check Table 1 below.
      • If P0A78-202 was output in step 1 of this diagnosis procedure, repair that DTC first, then check Table 2 below.

      Result

      Result Proceed to
      Only P0A78-128 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
      TABLE 1

      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 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
      P0A78-266, 267, 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
      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
      P3004-803 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
      TABLE 2

      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 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
      P0A60-294 Drive Motor "A" Phase V Current
      P0A63-302 Drive Motor "A" Phase W Current
      P0A78-266, 267, 287, 306, 505, 506, 586, 806, 807, 808 Drive Motor "A" Inverter Performance
      P0A94-585, 587, 589, 590 Inverter Performance
      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
      P3004-803 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.
      • P0A78-128 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   23 

    A: Go to next step 

  3. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) See step   7 

    NG → CONNECT SECURELY 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER) See step   3 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. CHECK MOTOR RESOLVER See step   4 

    NG → See step   13 

    OK: Go to next step 

  6. CHECK INVERTER WITH CONVERTER ASSEMBLY (MOTOR CABLE CONNECTION CONDITION) See step   6 

    B → REPLACE MALFUNCTIONING PARTS 

    C → CONNECT SECURELY 

    A: Go to next step 

  7. CHECK EV TRANSAXLE WITH MOTOR ASSEMBLY (MG2) See step   7 

    NG → See step   18 

    OK: Go to next step 

  8. CHECK FUSE (PCU) See step   8 

    NG → See step   15 

    OK: Go to next step 

  9. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY POWER SOURCE CIRCUIT) See step   9 

    NG → REPAIR OR REPLACE POWER SOURCE CIRCUIT 

    OK: Go to next step 

  10. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY) See step   10 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  11. CHECK POWER MANAGEMENT CONTROL ECU See step   11 

    NG → See step   20 

    OK: Go to next step 

  12. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR) See step   5 

    NG → CONNECT SECURELY 

    OK → See step   24 

  13. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR) See step   6 

    NG → CONNECT SECURELY 

    OK: Go to next step 

  14. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER) See step   7 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   22 

  15. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - PCU FUSE) See step   15 

    NG → See step   17 

    OK: Go to next step 

  16. REPLACE INVERTER WITH CONVERTER ASSEMBLY 

    Refer to COMPONENTS

    NEXT → REPLACE FUSE (PCU) 

  17. REPAIR OR REPLACE HARNESS OR CONNECTOR 

    NEXT → REPLACE FUSE (PCU) 

  18. CHECK EV TRANSAXLE WITH MOTOR ASSEMBLY (MOTOR CABLE CONNECTION CONDITION) See step   18 

    B → REPLACE MALFUNCTIONING PARTS 

    C → CONNECT SECURELY 

    A: Go to next step 

  19. CHECK MOTOR CABLE See step   19 

    NG → See step   25 

    OK → See step   22 

  20. 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   26 

  21. GO TO DTC CHART (P0A78-202). Refer to  DTC P0A78-202: Drive Motor "A" Inverter Performance  
  22. REPLACE EV TRANSAXLE WITH MOTOR ASSEMBLY. Refer to  COMPONENTS 
  23. GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART 
  24. REPLACE INVERTER WITH CONVERTER ASSEMBLY. Refer to  COMPONENTS 
  25. REPLACE MOTOR CABLE. Refer to  COMPONENTS 
  26. 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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