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Use the M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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Repair the CAN bus line. (Refer to GROUP 54C - Troubleshooting .)
Then go to Step 2.
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Check again if the diagnosis code No. U111C is set to the EV-ECU.
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(1)Erase the stored diagnosis code.
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(2)Set the electric motor switch from the LOCK (OFF) position to the ON position.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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This diagnosis is complete.
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Check if the diagnosis code is set to BMU.
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Q.
Is the diagnosis code set?
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Carry out troubleshooting for the BMU. (Refer to .)
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Check if the diagnosis code No. U111C is set to the compressor & heater controller.
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Q.
Is the diagnosis code set?
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Check again if the diagnosis code is set to the EV-ECU.
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(1)Erase the stored diagnosis code.
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(2)Set the electric motor switch from the LOCK (OFF) position to the ON position.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Replace the BMU. (Refer to .)
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A poor connection, open circuit of the wiring harness or other intermittent malfunction
is present in the CAN bus line between the BMU and EV-ECU (Refer to GROUP 00 - How
to Use Troubleshooting/Inspection Service Points, How to Handle Intermittent Malfunction)
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Check again if the diagnosis code is set to the EV-ECU.
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(1)Erase the stored diagnosis code.
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(2)Set the electric motor switch from the LOCK (OFF) position to the ON position.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Replace the EV-ECU. (Refer to .)
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A poor connection, open circuit of the wiring harness or other intermittent malfunction
is present in the CAN bus line between the BMU and EV-ECU (Refer to GROUP 00 - How
to Use Troubleshooting/Inspection Service Points, How to Handle Intermittent Malfunction)
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