HYBRID CONTROL SYSTEM Shut Down Signal Circuit

Info Added 2017-10-06

DESCRIPTION

The cause of the malfunction may be a shutdown signal.

Check whether there is a shutdown signal +B short circuit.

Related Parts Check
Area Inspection
HSDN terminal Check that the HSDN terminal voltage decreases to check for an open or short circuit while READY OFF (IG ON).
Hybrid vehicle control ECU, inverter, wire harness Check for open or short circuit in hybrid vehicle control ECU, inverter and wire harness.

SYSTEM DESCRIPTION

Power supply to the motor is cut off due to a shutdown signal sent from the hybrid vehicle control ECU to the motor generator control ECU (MG ECU).

WIRING DIAGRAM

A005N5SE31
*a from PCU FR Fuse
*b Inverter with Converter Assembly
*c Hybrid Vehicle Control ECU

CAUTION / NOTICE / HINT

This step is referenced from the procedures for each DTC.

If the inspection results below are normal, perform the next procedure for the referenced DTC.

CAUTION:


  • B0048QQ

    Before the following operations are conducted, take precautions to prevent electric shock by turning the power switch off, wearing insulated gloves, and removing the service plug grip from HV battery.


    • Inspecting the high-voltage system

    • Disconnecting the low voltage connector of the inverter with converter assembly

    • Disconnecting the low voltage connector of the HV battery


  • A005NJP

    To prevent electric shock, make sure to remove the service plug grip to cut off the high voltage circuit before servicing the vehicle.


  • A005NAH

    After removing the service plug grip from the HV battery, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.


  • B0048M5C01
    *a Without waiting for 10 minutes

    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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    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.

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PROCEDURE


  1. CHECK HYBRID VEHICLE CONTROL ECU


    1. Turn the power switch on (IG).

    2. A005NZLC19
      *a

      Component with harness connected

      (Hybrid Vehicle Control ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A48-12 (HSDN) - F2-6 (E1) Power switch on (IG) Below 4.5 V

    3. Turn the power switch off.

      Result
      Proceed to
      OK
      NG

    OK

    SHUTDOWN SIGNAL CIRCUIT NORMAL (PERFORM NEXT STEP FOR REFERENCED DTC)

    NG

  2. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE 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 inverter with converter assembly connector.

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    3. Disconnect the hybrid vehicle control ECU connector.

    4. Connect the cable to the negative (-) auxiliary battery terminal.

    5. Turn the power switch on (IG).

    6. A005NMKC03
      *a

      Front view of wire harness connector

      (to Inverter with Converter Assembly)
      *b

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      C65-22 (HSDN) or A48-12 (HSDN) - Body ground Power switch on (IG) Below 1 V

      Note

      Turning the power switch on (IG) with the hybrid vehicle control ECU and inverter with converter assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

    7. Turn the power switch off.

    8. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for 2 minutes or more.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C65-22 (HSDN) - C65-6 (+B) Power switch off 10 kΩ or higher
      C65-22 (HSDN) - C65-5 (+B2) Power switch off 10 kΩ or higher
      A48-12 (HSDN) - A48-4 (+B1) Power switch off 10 kΩ or higher
      A48-12 (HSDN) - A48-6 (MREL) Power switch off 10 kΩ or higher

    10. Reconnect the hybrid vehicle control ECU connector.

    11. Reconnect the inverter with converter assembly connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. 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 inverter with converter assembly connector.

    3. A005NZFC14
      *a

      Component without harness connected

      (Inverter with Converter Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C65-22 (HSDN) - C65-6 (+B) Power switch off 10 kΩ or higher
      C65-22 (HSDN) - C65-5 (+B2) Power switch off 10 kΩ or higher

    4. Reconnect the inverter with converter assembly connector.

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

    NG

    REFER TO REPLACE INVERTER WITH CONVERTER ASSEMBLY PARTS Click here