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HYBRID CONTROL SYSTEM, Diagnostic DTC:P324E-788

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

If the MG ECU, which is built into in the inverter with converter assembly, is reset due to a problem with the power source in the inverter, the hybrid vehicle control ECU assembly will stored this DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P324E-788 MG-ECU Power Relay Intermittent Circuit

Error in reset signal from the inverter assembly power source IC

If internal power source voltage drops below the normal CPU operating voltage or the ROM/RAM is malfunctioning, the power source IC resets the MG ECU and stores this DTC.

(1 trip detection logic)

  • Wire harness or connector

  • Inverter with converter assembly

 Does not come on

Master Warning Light:

Comes on
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WIRING DIAGRAM

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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.

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    Tip:

    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.

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Tip:

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Turn the power switch on (IG) and wait for 5 seconds or more.

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PROCEDURE


  1. Click here

    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.


      1. Powertrain > Hybrid Control > Trouble Codes


      Result
      Proceed to
      P324E-788 only is output.
      U0110-159, 160, 656, 657 are also output.

    5. Turn the power switch off.


    • P324E-788 only is output.Click here
    • U0110-159, 160, 656, 657 are also output.

      GO TO DTC CHART (HYBRID CONTROL SYSTEM)Click here

  2. Click here

    CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)

    Result
    Result Proceed to
    OK A
    NG (The connector is not connected securely.) B
    NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C
    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. A0020YPC01
      *A for LHD *B for RHD

      Check the connection condition of the low voltage connector of the inverter with converter assembly and the contact pressure of each terminal. Check the terminals for deformation, and check the connector for water ingress and foreign matter.

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      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.

      OK
      - The connector is connected securely.
      - The terminals are not deformed and are connected securely.
      - No water or foreign matter in the connector.
      Result
      Result Proceed to
      OK A
      NG (The connector is not connected securely.) B
      NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C
      Tip:

      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.


    • AClick here
    • B

      CONNECT SECURELY

    • C

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    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 A28*1 or A29*2 inverter with converter assembly connector.


      • *1: for LHD

      • *2: for RHD

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

    4. A002168C03
      *A for LHD *B for RHD
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly *2 IGCT Relay
      *a

      Front view of wire harness connector

      (to Inverter with Converter Assembly)

      		 - -

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

      Standard Resistance
      Table 1. for LHD
      Tester Connection Condition Specified Condition
      A28-10 (+B) - 5 (IGCT relay) Power switch off Below 1 Ω
      A28-11 (+B2) - 5 (IGCT relay) Power switch off Below 1 Ω
      A28-30 (GND1) - Body ground Power switch off Below 1 Ω
      A28-31 (GND2) - Body ground Power switch off Below 1 Ω
      Table 2. for RHD
      Tester Connection Condition Specified Condition
      A29-10 (+B) - 5 (IGCT relay) Power switch off Below 1 Ω
      A29-11 (+B2) - 5 (IGCT relay) Power switch off Below 1 Ω
      A29-30 (GND1) - Body ground Power switch off Below 1 Ω
      A29-31 (GND2) - Body ground Power switch off Below 1 Ω

    5. Install the IGCT relay.

    6. Reconnect the A28*1 or A29*2 inverter with converter assembly connector.


      • *1: for LHD

      • *2: for RHD

      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE INVERTER WITH CONVERTER ASSEMBLYClick here

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR