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
Power management control ECU, inverter If there is a shutdown signal malfunction, check for whether there is a power management control ECU or inverter malfunction. 2, 3

SYSTEM DESCRIPTION

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

WIRING DIAGRAM

A01I51BE04

INSPECTION PROCEDURE

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 Click here.

    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 Click here.

PROCEDURE


  1. CHECK POWER MANAGEMENT CONTROL ECU


    1. Turn the power switch on (IG).

    2. A01I4SQE48
      Text in Illustration
      *a

      Component with harness connected

      (Power Management Control ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A38-30 (HSDN) - I3-6 (E1) Power switch on (IG) Below 4.5 V
      Result
      Result Proceed to
      NG A
      OK B

    3. Turn the power switch off.


    B

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

    A

  2. 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. A01I5YK

      Disconnect the A14 inverter with converter assembly connector.

    3. Disconnect the A38 and A39 power management control ECU connectors.

    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.

      A01I3VZE01
      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)
      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A14-40 (HSDN) or A38-30 (HSDN) - Body ground Power switch on (IG) Below 1 V

      Note

      Turning the power switch on (IG) with the 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
      Tester Connection Switch Condition Specified Condition
      A38-30 (HSDN) - A39-1 (IG2) Power switch off 10 kΩ or higher
      A38-30 (HSDN) - A39-2 (IG2D) Power switch off 10 kΩ or higher
      A38-30 (HSDN) - A39-3 (+B1) Power switch off 10 kΩ or higher
      A38-30 (HSDN) - A38-4 (MREL) Power switch off 10 kΩ or higher
      A14-40 (HSDN) - A14-30 (+B) Power switch off 10 kΩ or higher
      A14-40 (HSDN) - A14-31 (+B2) Power switch off 10 kΩ or higher

    10. Reconnect the A38 and A39 power management control ECU connectors.

    11. Reconnect the A14 inverter with converter assembly connector.


    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 A14 inverter with converter assembly connector.

    3. A01I4Z1E04
      Text in Illustration
      *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 Switch Condition Specified Condition
      A14-40 (HSDN) - A14-30 (+B) Power switch off 5 kΩ or higher
      A14-40 (HSDN) - A14-31 (+B2) Power switch off 5 kΩ or higher

    4. Reconnect the A14 inverter with converter assembly connector.


    NG

    REPLACE INVERTER WITH CONVERTER ASSEMBLY Click here

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here