If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, always diagnose the CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
MCU will set the diagnosis code No. P1B14 under the following conditions in the driving mode.
If the EV-ECU torque command value is kept at a value other than 0 Nm when the following diagnosis codes are set
Diagnosis code P0C11 Motor coil U-phase temperature rise abnormality
Diagnosis code P0C12 Motor coil V-phase temperature rise abnormality
Diagnosis code P0C13 Motor coil W-phase temperature rise abnormality
Diagnosis code P0A3C IGBT1 abnormal temperature rise
Diagnosis code P0A3D IGBT2 abnormal temperature rise (MCU)
Diagnosis code P0A3E CPU ambient temperature high abnormality (MCU)
When the torque command value from EV-ECU is not controlled although MCU requests the torque control because of the temperature rise of the motor coil or IGBT (inverter)
PROBABLE CAUSES
Malfunction of the MCU
Malfunction of the EV-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
Use the M.U.T.-III to diagnose the CAN bus lines.
Q.
Is the check result normal?
Go to Step 3.
Repair the CAN bus line. (Refer to GROUP 54C - Troubleshooting .) Then go to Step 2.
STEP 2. Diagnosis code recheck
Check again if the diagnosis code No. P1B14 is set to the MCU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.
Q.
Is the diagnosis code set?
Go to Step 3.
The diagnosis is complete.
STEP 3. M.U.T.-III Diagnosis code of other systems
Check if the diagnosis code is set to the EV-ECU.
Q.
Is the diagnosis code set?
Carry out troubleshooting for the EV-ECU. (Refer to .) Then go to Step 4.
Go to Step 4.
STEP 4. Diagnosis code recheck
Check again if the diagnosis code is set to the MCU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the LOCK (OFF) position to the ON position.
(3)Check if the diagnosis code is set.
Q.
Is the diagnosis code set?
Replace the MCU. (Refer to .) Then go to Step 5.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .)
STEP 5. Diagnosis code recheck
Check again if the diagnosis code is set to the MCU.
(1)Erase the stored diagnosis code.
(2)Set the electric motor switch from the LOCK (OFF) position to the ON position.
Go to Step 3.
Repair the CAN bus line. (Refer to GROUP 54C - Troubleshooting 
.) Then go to Step 2.