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Home >> Lexus >> 2010 >> HS 250h >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> Hybrid Control (Diagnostic Codes (P0343-747 - P0A78-282) >> 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 (HV) 
    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
      P0A78-128 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
      P0A78-266, 267, 279, 287, 306, 503, 504, 505, 506, 586, 806, 807, 808 Drive Motor "A" Inverter Performance
      P0A7A-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
      P0ADB-227 Hybrid Battery Positive Contactor Control Circuit Low
      P0ADC-226 Hybrid Battery Positive Contactor Control Circuit High
      P0ADF-229 Hybrid Battery Negative Contactor Control Circuit Low
      P0AE0-228 Hybrid Battery Negative Contactor Control Circuit High
      P0C76-523 Hybrid Battery System Discharge Time Too Long
      P3004-803 High Voltage Power Resource

      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   17 

    A: Go to next step 

  2. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) See step   4 

    NG → CONNECT SECURELY 

    OK: Go to next step 

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

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. CHECK GENERATOR RESOLVER See step   4 

    NG → See step   13 

    OK: Go to next step 

  5. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER) See step   5 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. CHECK MOTOR RESOLVER See step   6 

    NG → See step   15 

    OK: Go to next step 

  7. CHECK INVERTER WITH CONVERTER ASSEMBLY (GENERATOR CABLE CONNECTION CONDITION) See step   4 

    C → CONNECT SECURELY 

    B → REPLACE MALFUNCTIONING PARTS 

    A: Go to next step 

  8. CHECK INVERTER WITH CONVERTER ASSEMBLY (MOTOR CABLE CONNECTION CONDITION) See step   5 

    C → CONNECT SECURELY 

    B → REPLACE MALFUNCTIONING PARTS 

    A: Go to next step 

  9. CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (MG1) See step   6 

    NG → See step   18 

    OK: Go to next step 

  10. CHECK HYBRID VEHICLE TRANSAXLE ASSEMBLY (MG2) See step   7 

    NG → See step   18 

    OK: Go to next step 

  11. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR) See step   7 

    NG → CONNECT SECURELY 

    OK: Go to next step 

  12. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR) See step   8 

    NG → CONNECT SECURELY 

    OK → See step   19 

  13. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR) See step   9 

    NG → CONNECT SECURELY 

    OK: Go to next step 

  14. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RESOLVER) See step   10 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   18 

  15. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR) See step   11 

    NG → CONNECT SECURELY 

    OK: Go to next step 

  16. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER) See step   12 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   18 

  17. GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART 
  18. REPLACE HYBRID VEHICLE TRANSAXLE ASSEMBLY. Refer to COMPONENTS 
  19. REPLACE INVERTER WITH CONVERTER ASSEMBLY. Refer to COMPONENTS 
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