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HYBRID CONTROL SYSTEM, Diagnostic DTC:P321E-318

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DTC Code DTC Name
P321E-318 All HV Gate Blocking Range/Performance
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DESCRIPTION

The power management control ECU sends a block signal to the motor generator control ECU (MG ECU) to shutdown the power supply to the motor. When the system is not in the on (READY) state, it sends an HSDN (MG shutdown signal) signal from the power management control ECU to the motor generator control ECU (MG ECU) to check the function of the HV gate block. When a malfunction is detected in the HV gate block function, DTCs are stored.

DTC No. INF Code DTC Detection Condition Trouble Area
P321E 318

  • An open or ground short in the HV gate block signal circuit when the gate is operating

  • When the HV gate block function is being checked, inverter voltage (VH) drops or current flows in the inverter. (Both the motor (MG2) and the generator (MG1) are malfunctioning.)

  • Wire harness or connector

  • Power management control ECU

  • Inverter with converter assembly
Table 1. *1 to INV Fuse *2 Inverter with Converter Assembly *3 Power Management Control ECU
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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 (Click here).

    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 (Click here).

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PROCEDURE


  1. Click here

    CHECK CONNECTOR CONNECTION CONDITION (POWER MANAGEMENT CONTROL ECU CONNECTOR)


    1. A0009DG

      Check the connector connections and contact pressure of the relevant terminals for the power management control ECU connectors (Click here).

      OK
      The connectors are connected securely and there are no contact pressure problems.

  2. Click here

    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. A00046KE03

      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 does not pull out.

      OK
      The connectors are connected securely and there are no contact pressure problems.
      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.


  3. Click here

    CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY)

    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 A14 inverter with converter assembly connector.

    3. Disconnect the A33 power management control ECU connector.

    4. A0009NEE01

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A33-31 (HSDN) or A14-40 (HSDN) - Body ground and other terminals Power switch off 10 kΩ or higher
      A33-31 (HSDN) - A14-40 (HSDN) Power switch off Below 1 Ω
      Table 2. Text in Illustration
      *a

      Front view of wire harness connector

      (to Inverter with Converter Assembly)
      *b

      Rear view of wire harness connector

      (to Power Management Control ECU)

    5. Reconnect the A33 power management control ECU connector.

    6. Reconnect the A14 inverter with converter assembly connector.


    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. Click here

    CHECK INVERTER WITH CONVERTER ASSEMBLY

    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 A14 inverter with converter assembly connector.

    3. A0008H6E03

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A14-40 (HSDN) - A14-10 (GND1) Power switch off 2.65 to 3.55 kΩ
      Table 3. Text in Illustration
      *a

      Component without harness connected

      (Inverter with Converter Assembly)

    4. Reconnect the A14 inverter with converter assembly connector.


    • OK

      REPLACE POWER MANAGEMENT CONTROL ECU (Click here)

    • NG

      REPLACE INVERTER WITH CONVERTER ASSEMBLY (Click here)