HYBRID CONTROL SYSTEM, Diagnostic DTC:P0A78-586

DTC Code DTC Name
P0A78-586 Drive Motor "A" Inverter Performance

DESCRIPTION

Refer to the description for DTC P0A78-266 Click here.

The signal line from the inverter voltage (VH) sensor is connected to the MG ECU inside the inverter with converter assembly. If P0A78-586 is output, replace the inverter with converter assembly.

DTC No. INF Code DTC Detection Condition Trouble Area
P0A78 586 Inverter voltage (VH) sensor performance problem Inverter with converter assembly

INSPECTION PROCEDURE

Tech Tips

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Turn the power switch on (READY) with park (P) selected.

  2. Confirm that the Data List item "Boost Ratio" is 0 % when the accelerator pedal is not depressed. Check that the Data List items "VH-Voltage after Boosting" and "Power Resource VB" are almost the same.

PROCEDURE


  1. CHECK DTC OUTPUT (HV)


    1. Connect the intelligent tester 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
      P0A78-586 only is output. A
      DTCs shown in Table 1 are output simultaneously. B
      DTCs shown in Table 2 are output simultaneously. C
      Table 1
      DTC No. Relevant Diagnosis
      P0A1A-151, 155, 156, 658, 659 Generator Control Module
      P0A1B-164, 193, 512, 661, 786 Drive Motor "A" Control Module
      P0A1D-148 Hybrid Powertrain Control Module
      P0A78-266, 267 Drive Motor "A" Inverter Performance
      P0A94-589, 590 DC/DC Converter Performance
      P2511-149 HV CPU Power Relay Sense Circuit Intermittent No Continuity
      P3004-132 Power Cable Malfunction
      P324E-788 MG-ECU Power Relay Intermittent Circuit
      U0110 (all INF codes)*1 Lost Communication with Drive Motor Control Module "A"
      Table 2
      DTC No. Relevant Diagnosis
      P0AFC-123 Hybrid Battery Pack Sensor Module
      P0B3D-123 Hybrid Battery Voltage Sensor "A" Circuit Low
      P0B42-123 Hybrid Battery Voltage Sensor "B" Circuit Low
      P0B47-123 Hybrid Battery Voltage Sensor "C" Circuit Low
      P0B4C-123 Hybrid Battery Voltage Sensor "D" Circuit Low
      P0B51-123 Hybrid Battery Voltage Sensor "E" Circuit Low
      P0B56-123 Hybrid Battery Voltage Sensor "F" Circuit Low
      P0B5B-123 Hybrid Battery Voltage Sensor "G" Circuit Low
      P0B60-123 Hybrid Battery Voltage Sensor "H" Circuit Low
      P0B65-123 Hybrid Battery Voltage Sensor "I" Circuit Low
      P0B6A-123 Hybrid Battery Voltage Sensor "J" Circuit Low
      P0B6F-123 Hybrid Battery Voltage Sensor "K" Circuit Low
      P0B74-123 Hybrid Battery Voltage Sensor "L" Circuit Low
      P0B79-123 Hybrid Battery Voltage Sensor "M" Circuit Low
      P0B7E-123 Hybrid Battery Voltage Sensor "N" Circuit Low
      P0B83-123 Hybrid Battery Voltage Sensor "O" Circuit Low
      P308A-123 Hybrid Battery Voltage Detection Circuit Open

      Tech Tips


      • *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.

      • P0A78-586 may be output due to a malfunction which causes the DTCs in the table above to be output. In this case, first troubleshoot the output DTCs in the table above. Then, perform a reproduction test to check that no DTCs are output.

    5. Turn the power switch off.


    B

    GO TO DTC CHART Click here

    A

    REFER TO REPLACE INVERTER WITH CONVERTER ASSEMBLY PARTS Click here