HYBRID CONTROL SYSTEM Shut Down Signal Circuit

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 the HSDN signal line for an open or short circuit while READY OFF (power switch on (IG)).
Hybrid vehicle control ECU assembly, inverter, wire harness Check for open or short circuit in hybrid vehicle control ECU assembly, 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 assembly to the motor generator control ECU (MG ECU).

WIRING DIAGRAM

B004R9LE46

Refer to the wiring diagram for DTC P06881F.

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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:


  • B004STG

    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

  • B004Y5N

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

  • B004SX1

    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.

  • B004W3JC06
    *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.

  • Make sure to insulate the high-voltage connectors and terminals of the HV battery with insulating tape after removing it.

    If the HV battery stored without insulating the connectors and terminals, electric shock or fire may result.

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 ASSEMBLY


    1. Turn the power switch on (IG).

    2. B004RWIC94
      *a

      Component with harness connected

      (Hybrid Vehicle Control ECU Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A77-25 (HSDN) - G92-6 (E1) Power switch on (IG) Below 4.5 V
    3. Turn the power switch off.

      Result
      Proceed to
      OK
      NG

    OK
    NG
  2. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - 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 A94*1, A78*2 inverter with converter assembly connector.


      • *1: for LHD

      • *2: for RHD

    3. Disconnect the A77 and G92 hybrid vehicle control ECU assembly connectors.

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

    5. Turn the power switch on (IG).

    6. B004VZXC07
      *A for LHD
      *B for RHD
      *a

      Front view of wire harness connector

      (to Inverter with Converter Assembly)

      *b

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU Assembly)

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

      Standard Voltage
      for LHD:
      Tester Connection Condition Specified Condition
      A94-40 (HSDN) or A77-25 (HSDN) - Body ground Power switch on (IG) Below 1 V
      for RHD:
      Tester Connection Condition Specified Condition
      A78-40 (HSDN) or A77-25 (HSDN) - Body ground Power switch on (IG) Below 1 V

      Note

      Turning the power switch on (IG) with the hybrid vehicle control ECU assembly 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
      for LHD:
      Tester Connection Condition Specified Condition
      A94-40 (HSDN) - A94-10 (+B) Power switch off 10 kΩ or higher
      A94-40 (HSDN) - A94-11 (+B2) Power switch off 10 kΩ or higher
      A77-25 (HSDN) - G92-4 (+B1) Power switch off 10 kΩ or higher
      A77-25 (HSDN) - A77-1 (MREL) Power switch off 10 kΩ or higher
      for RHD:
      Tester Connection Condition Specified Condition
      A78-40 (HSDN) - A78-10 (+B) Power switch off 10 kΩ or higher
      A78-40 (HSDN) - A78-11 (+B2) Power switch off 10 kΩ or higher
      A77-25 (HSDN) - G92-4 (+B1) Power switch off 10 kΩ or higher
      A77-25 (HSDN) - A77-1 (MREL) Power switch off 10 kΩ or higher
    10. Reconnect the A77 and G92 hybrid vehicle control ECU assembly connectors.

    11. Reconnect the A94*1, A78*2 inverter with converter assembly connector.


      • *1: for LHD

      • *2: for RHD

      Result
      Proceed to
      OK
      NG

    NG
    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 A94*1, A78*2 inverter with converter assembly connector.


      • *1: for LHD

      • *2: for RHD

    3. B004X1GC46
      *A for LHD
      *B for RHD
      *a

      Component without harness connected

      (Inverter with Converter Assembly)

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

      Standard Resistance
      for LHD:
      Tester Connection Condition Specified Condition
      A94-40 (HSDN) - A94-10 (+B) Power switch off 10 kΩ or higher
      A94-40 (HSDN) - A94-11 (+B2) Power switch off 10 kΩ or higher
      for RHD:
      Tester Connection Condition Specified Condition
      A78-40 (HSDN) - A78-10 (+B) Power switch off 10 kΩ or higher
      A78-40 (HSDN) - A78-11 (+B2) Power switch off 10 kΩ or higher
    4. Reconnect the A94*1, A78*2 inverter with converter assembly connector.


      • *1: for LHD

      • *2: for RHD

      Result
      Proceed to
      OK
      NG

    OK
    NG