HYBRID CONTROL SYSTEM, Diagnostic DTC:P0A79-703

DTC Code DTC Name
P0A79-703 Drive Motor "B" Inverter Performance

DESCRIPTION

For a description of the inverter, Click here.

If the inverter receives a rear motor gate shutdown signal from the MG ECU, it will turn all power transistors off which are activating MGR to forcibly stop MGR operation. The MG ECU monitors the rear motor gate shutdown signal line and detects a malfunction.

Tech Tips

The term "drive motor B" indicates MGR.

DTC No. INF Code DTC Detection Condition Trouble Area
P0A79 703 Rear motor inverter gate malfunction Inverter with converter assembly

Tech Tips


  • If DTC P0A79-703 is output, the hybrid system cannot be restarted until the DTC is cleared.

  • If the malfunction is not reproduced, turn the power switch on (READY) and leave the vehicle for 1 minute with the shift lever in P or N in order to easily reproduce the malfunction.

INSPECTION PROCEDURE

CAUTION:


  • Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.

  • After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.

Tech Tips

Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

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