HYBRID CONTROL SYSTEM, Diagnostic DTC:P0A78-510

DTC Code DTC Name
P0A78-510 Drive Motor "A" Inverter Performance

DESCRIPTION

For a description of the inverter, Click here.

If the inverter receives a motor gate shutdown signal from the MG ECU, it will turn all power transistors off which are activating MG2 to forcibly stop MG2 operation.

The MG ECU monitors motor gate shutdown signals and detects a malfunction.

DTC No. INF Code DTC Detection Condition Trouble Area
P0A78 510 Motor inverter gate malfunction Inverter with converter assembly

Tech Tips


  • When P0A78-510 has been stored, the hybrid system cannot be restarted until the DTC is cleared.

  • If the problem symptom cannot be reproduced, leaving the vehicle with the power switch on (READY) and the shift lever in N for 1 minute will make it easier to reproduce the symptom.

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)

    CAUTION:

    Be sure to wear insulated gloves.


    1. Check that the service plug grip is not installed.

      Note

      After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair manual because this may cause a malfunction.

      Note

      Before disconnecting the connector, confirm that it is properly connected by checking that the locking claws are engaged and that the connector does not pull out.

      A01NHWR

    2. Check the connection of the low voltage connector of the inverter with converter assembly.

      OK
      The connector is connected securely and there are no contact problems.

      Tech Tips

      When connecting the connector, insert it with the locking lever in the raised position. Rotate the lever downward and make sure that the connector is pulled into its socket. When the locking lever is in its fully closed position, a click will be heard as its locking claws engage. After the click is heard, pull up on the connector to confirm that it is properly connected.


    NG

    CONNECT SECURELY

    OK

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here