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 Step
HSDN terminal voltage

Check that the HSDN terminal voltage decreases while READY OFF (IG ON).

If the voltage is low, the shutdown signal circuit is normal.

 1
Hybrid vehicle control ECU assembly, inverter If there is a shutdown signal malfunction, check for whether there is a hybrid vehicle control ECU assembly or inverter malfunction. 2, 3

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

B004F66E07

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:


  • 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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    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 ASSEMBLY


    1. Turn the power switch on (IG).

    2. B004F2BC95
      *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
      A81-12 (HSDN) - O141-6 (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 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 A81 hybrid vehicle control ECU assembly connector.

    3. Disconnect the A83*1 or A26*2 inverter with converter assembly connector.

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      • *1: for LHD

      • *2: for RHD

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

    5. Turn the power switch on (IG).

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

      B004FPSC11
      *A for LHD *B for RHD
      *a

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU Assembly)

      		 *b

      Front view of wire harness connector

      (to Inverter with Converter Assembly)
      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      A83-25 (HSDN) or A81-12 (HSDN) - Body ground Power switch on (IG) Below 1 V
      Standard Voltage
      for RHD
      Tester Connection Condition Specified Condition
      A26-25 (HSDN) or A81-12 (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.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      A83-25 (HSDN) - A83-10 (+B) Power switch off 10 kΩ or higher
      A83-25 (HSDN) - A83-11 (+B2) Power switch off 10 kΩ or higher
      A81-12 (HSDN) - A81-4 (+B1) Power switch off 10 kΩ or higher
      A81-12 (HSDN) - A81-6 (MREL) Power switch off 10 kΩ or higher
      Standard Resistance
      for RHD
      Tester Connection Condition Specified Condition
      A26-25 (HSDN) - A26-10 (+B) Power switch off 10 kΩ or higher
      A26-25 (HSDN) - A26-11 (+B2) Power switch off 10 kΩ or higher
      A81-12 (HSDN) - A81-4 (+B1) Power switch off 10 kΩ or higher
      A81-12 (HSDN) - A81-6 (MREL) Power switch off 10 kΩ or higher

    10. Reconnect the A83*1 or A26*2 inverter with converter assembly connector.


      • *1: for LHD

      • *2: for RHD

    11. Reconnect the A81 hybrid vehicle control ECU 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 A83*1 or A26*2 inverter with converter assembly connector.


      • *1: for LHD

      • *2: for RHD

    3. B004EWAC30
      *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
      A83-25 (HSDN) - A83-10 (+B) Power switch off 5 kΩ or higher
      A83-25 (HSDN) - A83-11 (+B2) Power switch off 5 kΩ or higher
      Standard Resistance
      for RHD
      Tester Connection Condition Specified Condition
      A26-25 (HSDN) - A26-10 (+B) Power switch off 5 kΩ or higher
      A26-25 (HSDN) - A26-11 (+B2) Power switch off 5 kΩ or higher

    4. Reconnect the A83*1 or A26*2 inverter with converter assembly connector.


      • *1: for LHD

      • *2: for RHD

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY Click here

    NG

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here