HYBRID CONTROL SYSTEM, Diagnostic DTC:P324E-788

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

DESCRIPTION

If the MG ECU located in the inverter with converter assembly is reset due to a problem with the power source in the inverter, the power management control ECU will store 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

  • Power management control ECU

WIRING DIAGRAM

A000PEQE20

CAUTION / NOTICE / HINT

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 removing 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 Click here.

    Tech Tips

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

Note

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.

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 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 (HYBRID CONTROL SYSTEM) 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.

    2. Check the connector connections and contact pressure of the low voltage connectors of the inverter with converter assembly Click here.

      Note

      Before disconnecting the connector, confirm that it is properly connected by checking that the locking claws are engaged and that the connector cannot be pulled out.

      B002BBWE01
      Text in Illustration
      *A for LHD *B for RHD
      OK
      The connectors are connected securely and there are no contact pressure 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 - IGCT RELAY)

    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 the connector from the inverter with converter assembly.

    3. Remove the IGCT relay from the No. 1 engine room relay block and junction block assembly.

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

      A000RS7E02
      Text in Illustration
      *A for LHD *B for RHD
      *1 No. 1 Engine Room Relay Block and Junction Block Assembly *2 IGCT Relay
      *a

      Front view of wire harness connector

      (to Inverter with Converter Assembly)

      		 - -
      Standard Resistance (Check for Open)
      for LHD
      Tester Connection Switch Condition Specified Condition
      A38-10 (+B) - 5 (IGCT relay) Power switch off Below 1 Ω
      A38-11 (+B2) - 5 (IGCT relay) Power switch off Below 1 Ω
      A38-30 (GND1) - Body ground Power switch off Below 1 Ω
      A38-31 (GND2) - Body ground Power switch off Below 1 Ω
      for RHD
      Tester Connection Switch Condition Specified Condition
      A74-10 (+B) - 5 (IGCT relay) Power switch off Below 1 Ω
      A74-11 (+B2) - 5 (IGCT relay) Power switch off Below 1 Ω
      A74-30 (GND1) - Body ground Power switch off Below 1 Ω
      A74-31 (GND2) - Body ground Power switch off Below 1 Ω
      Standard Resistance (Check for Short)
      for LHD
      Tester Connection Switch Condition Specified Condition
      A38-10 (+B) or A38-11 (+B2) - Body ground and other terminals Power switch off 10 kΩ or higher
      for RHD
      Tester Connection Switch Condition Specified Condition
      A74-10 (+B) or A74-11 (+B2) - Body ground and other terminals Power switch off 10 kΩ or higher

    5. Install the IGCT relay.

    6. Connect the power management control ECU connector.


    OK

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR