HYBRID CONTROL SYSTEM, Diagnostic DTC:P324E-788

DTC Code DTC Name
P324E-788 MG-ECU Power Relay Intermittent Circuit

DESCRIPTION

If the inverter with converter assembly (MG ECU) is reset due to a problem with the power source in the inverter, the power management control ECU (HV CPU) will set this DTC.

DTC No. INF Code DTC Detection Condition Trouble Area
P324E 788 Error in reset signal from the inverter assembly power source IC

  • Wire harness or connector

  • Inverter with converter assembly

  • Engine room relay block No. 2

  • Power management control ECU

WIRING DIAGRAM

A01NH15E01

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.

Tech Tips

After repair, confirm that no DTCs are output by performing DTC Output Confirmation Operation Click here.

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
      P324E-788 only is output. A
      U0110-159, 160, 656, 657 are also output. B

    5. Turn the power switch off.


    B

    GO TO DTC CHART Click here

    A

  2. 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

  3. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - HV SUB R/B 1)

    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.

    2. Disconnect connector A79 from the inverter with converter assembly.

    3. Remove the IGCT MAIN relay from the engine room relay block No. 2.

    4. Measure the resistance according to the value(s) in the table below.

      A01NFF6E01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Inverter with Converter Assembly)

      		 *2 Engine Room Relay Block No. 2
      *3 IGCT MAIN Relay - -
      Standard Resistance (Check for open)
      Tester Connection Switch Condition Specified Condition
      A79-30 (+B) - 3 (IGCT MAIN relay) Power switch off Below 1 Ω
      A79-31 (+B2) - 3 (IGCT MAIN relay) Power switch off Below 1 Ω
      A79-10 (GND1) - Body ground Power switch off Below 1 Ω
      A79-11 (GND2) - Body ground Power switch off Below 1 Ω
      Standard Resistance (Check for short)
      Tester Connection Switch Condition Specified Condition
      A79-30 (+B) or A79-31 (+B2) - Body ground and other terminals Power switch off 10 kΩ or higher

    5. Install the IGCT MAIN relay.

    6. Connect the power management control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REFER TO REPLACE INVERTER WITH CONVERTER ASSEMBLY PARTS Click here