HYBRID CONTROL SYSTEM, Diagnostic DTC:P0A78-586

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

DTC SUMMARY


  1. MALFUNCTION DESCRIPTION

    The hybrid vehicle control ECU detects a VH sensor malfunction.

    The cause of this malfunction may be one of the following:


      Inside of inverter voltage sensor circuit malfunction

    • Voltage sensor malfunction

    • Motor generator control ECU (MG ECU) malfunction

    • Communication (wire harness) malfunction


      High voltage system malfunction

    • Inverter with converter assembly malfunction

DESCRIPTION

For a description of the inverter.

Click here

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

Tech Tips

The term "drive motor A" indicates the motor (MG2).

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P0A78-586 Drive Motor "A" Inverter Performance

Inverter voltage (VH) sensor performance malfunction:

Difference between "VH-Voltage after Boosting" and "VL-Voltage before Boosting" is large and difference between "VH-Voltage after Boosting" and "Power Resource VB" is large.

(1 trip detection logic)

 Inverter with converter assembly Comes on

Master Warning Light:

Comes on
Related Data List
DTC No. Data List
P0A78-586

  • VL-Voltage before Boosting

  • VH-Voltage after Boosting

  • Power Resource VB

  • Boost Ratio

CAUTION / NOTICE / HINT

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 the shift lever in P.

  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 (HYBRID CONTROL)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

    4. Check for DTCs.


      Powertrain > Hybrid Control > Trouble Codes
      Result
      Result Proceed to
      P0A78-586 only is output, or DTCs except the ones in the tables below are also output. A
      DTCs shown in Table 1 are output simultaneously. B
      DTCs shown in Table 2 are output simultaneously. C
      Table 1
      Malfunction Content Relevant DTC
      Microcomputer malfunction 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
      P324E-788 MG-ECU Power Relay Intermittent Circuit
      Power source circuit malfunction P2511-149 ECM/PCM Power Relay Sensor Circuit Intermittent
      Communication system malfunction U0110 (all INF codes)*1 Lost Communication with Drive Motor Control Module "A"
      Sensor and actuator circuit malfunction P0A78-266, 267 Drive Motor "A" Inverter Performance
      P0A94-589, 590 DC/DC Converter Performance
      Table 2
      Malfunction Content Relevant DTC
      Microcomputer malfunction P0AFC-123 Hybrid Battery Pack Sensor Module
      Sensor and actuator circuit malfunction 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
      P0B88-123 Hybrid Battery Voltage Sensor "P" Circuit Low
      P0B8D-123 Hybrid Battery Voltage Sensor "Q" Circuit Low
      P0B92-123 Hybrid Battery Voltage Sensor "R" Circuit Low
      P308A-123 Hybrid Battery Voltage Sensor All Circuits Low

      Tech Tips


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

      • P0A78-586 may be output as a result of the malfunction indicated by the DTCs above.


        1. The chart above is listed in inspection order of priority.

        2. Check DTCs that are output at the same time by following the listed order. (The main cause of the malfunction can be determined without performing unnecessary inspections.)

    5. Turn the power switch off.


    A

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    B

    GO TO DTC CHART (HYBRID CONTROL SYSTEM) Click here

    C

    GO TO DTC CHART (HYBRID BATTERY SYSTEM) Click here