Code No. P0C11:
Motor coil U-phase temperature rise abnormality Code No. P0C12: Motor coil V-phase
temperature rise abnormality Code No. P0C13: Motor coil W-phase temperature rise abnormality
ELECTRIC MOTOR UNIT CONTROL SYSTEM CIRCUIT
DIAGNOSIS CODE SET CONDITIONS
If the motor (electric motor unit) coil U-phase temperature is kept at 165°C
or more when the electric motor switch is set to the ON position, the MCU will set the diagnosis code
No. P0C11.
If the motor (electric motor unit) coil V-phase temperature (presumption) is kept
at 165°C or more when the electric motor switch is set to the ON position, the MCU
will set the diagnosis code No. P0C12.
If the motor (electric motor unit) coil W-phase temperature is kept at 165°C or
more when the electric motor switch is set to the ON position, the MCU will set the diagnosis code
No. P0C13.
note
The diagnosis code may be set by some driving operations such as high load, low-speed
driving, or overuse of cooling.
PROBABLE CAUSES
Malfunction of the system cooling such as radiator, water
pump, coolant
Malfunction of the temperature sensor circuit system
Malfunction of the motor (electric motor unit)
Malfunction of the MCU
DIAGNOSIS PROCEDURE
STEP 1. Use M.U.T.-III to confirm a 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 .)
Go to Step 2.
STEP 2. Connector check: E-07 MCU, motor (electric motor unit) connector
check
Q.
Is the check result normal?
YES : Go to Step 3.
Repair the damaged connector.
STEP 3. Check the resistance of the coil temperature sensor.
(1)Disconnect the E-07 MCU, motor (electric motor unit) connector.
(2)Measure the resistance value of the coil temperature sensor (U-phase and W-phase)
between the E-07 motor (electric motor unit) connector terminals.
Terminal No.
Normal value
3 - 9 (W-phase)
12.3 to 12.8 kΩ: 20°C 5.6 to 6.1 kΩ: 40°C 2.8 to 3.2 kΩ: 60°C 1.5 to 1.8 kΩ: 80°C
2 - 8 (U-phase)
Q.
Are all the check results normal?
Go to Step 4.
Replace the motor (electric motor unit).() Then
go to Step 5.
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)Set the electric motor switch to the "LOCK" (OFF) position, and start the electric
motor unit.
(4)Run the vehicle.
(5)Check if the diagnosis code is set.
Q.
Is the diagnosis code set?
Replace the MCU. (Refer to .) Then go to Step
5.
The diagnosis is complete.
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.
(3)Set the electric motor switch to the "LOCK" (OFF) position, and start the electric
motor unit.
)
)
Carry out troubleshooting for the EV-ECU. (Refer to 
.)
Go to Step 2.
: Go to Step 3.