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DTC P0C14: Motor coil U-phase temperature too high
DTC P0C16: Motor coil W-phase temperature too high
 
 
 
 
MONITOR EXECUTION
  • Continuous
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
  • Not applicable
Sensor (The sensor below is determined to be normal)
  • Drive motor coil temperature sensor
 
 
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
  • REMCU power supply voltage is 8 volts to 16 volts.
Judgment Criterion
  • Change of the coil temperature is more than 165°C (329°F) (4.685 volts) for 1 second.
 
 
OBD-II DRIVE CYCLE PATTERN
  • Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
 
 
PROBABLE CAUSES
  • The EV cooling system fails (radiator fan, EV radiator, electric water pump)
  • The temperature sensor circuit fails
  • Malfunction of the rear motor/rear transaxle assembly
  • Malfunction of the REMCU

 
 
DIAGNOSIS
Required Special Tools
  • MB991223: Wiring harness set
  • MB992006: Extra fine probe
STEP 1. Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
Check whether the PHEV-ECU set a DTC P0A05 or P10D9 which is related to the electric water pump.
Is the DTC set?
Carry out troubleshooting for the DTC P0A05 or P10D9 (Refer to GROUP 54Da - PHEV-ECU - Troubleshooting <DTC P0A05> or <DTC P10D9>). Then go to Step 9.
Go to Step 2.
 
STEP 2. Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
Check whether the PHEV-ECU set a DTC P0691, P0692, P0693, P0694, P10DE or P10DF which is related to the fan, fan motor and fan shroud assembly.
Is the DTC set?
Carry out troubleshooting for the DTC P0691, P0692, P0693, P0694, P10DE or P10DF (Refer to GROUP 54Da - PHEV-ECU - Troubleshooting <DTC P0691, P0692, P0693, P0694>, <DTC P10DE, P10DF>). Then go to Step 9.
Go to Step 3.
 
STEP 3. Check the resistance in the coil temperature sensor.
(1) Disconnect the REMCU connector.
(2) Check the conduction of the harness between the REMCU and the rear motor/rear transaxle assembly and measure the resistance value of the coil temperature sensor (U-phase and W-phase) in the REMCU connector terminals.
 
Terminal symbolNormal
TH1 to TG1 (U-phase)
  • Approx. 65kΩ to 90kΩ at -20°C (-4°F)
  • Approx. 25kΩ to 35kΩ at 0°C (32°F)
  • Approx. 12kΩ to 15kΩ at 20°C (68°F)
  • Approx. 5kΩ to 7kΩ at 40°C (104°F)
TH2 to TG2 (W-phase)
Is the check result normal?
Go to Step 4.
Replace the wiring harness (TH1 line, TG1 line, TH2 line, TG2 line) and the rear motor/rear transaxle assembly (Refer to ). Then go to Step 9.
 
STEP 4. Using scan tool (M.U.T.-IIISE), check the actuator test.
Check the following actuator test (Refer to GROUP 54Da - PHEV-ECU - Actuator Test Reference Table ).
  • Item No.3: Radiator fan relay 1 actuate
  • Item No.4: Radiator fan relay 2 actuate
Is the check result normal?
Go to Step 5.
Replace the fan, fan motor and fan shroud assembly (Refer to GROUP 14A - Radiator ). Then go to Step 9.
 
STEP 5. Check the EV radiator.
Visually check that the fins of the EV radiator are not dented or deformed.
Is the check result normal?
Go to Step 6.
Replace the EV radiator (Refer to GROUP 14B - EV radiator/EV radiator condenser tank ). Then go to Step 9.
 
STEP 6. Check the motor coolant level.
Check that the motor coolant level is normal. (Refer to GROUP 14B - Motor Coolant Check ).
Is the check result normal?
Go to Step 7.
Replace the parts causing a coolant leak, and then supply coolant. (Refer to GROUP 14B - Motor Coolant Change ). Then go to Step 7.
 
STEP 7. Using scan tool (M.U.T.-IIISE), check the special function.
(1) Execute the following special function (Refer to GROUP 54Da - PHEV-ECU - Special Function, Test ).
  • Item 2: Water pump actuate
(2) When forcibly driving the electric water pump, check that the coolant in the EV radiator condenser tank is flowing.
Is coolant flowing?
Go to Step 9.
Replace the water hose and water pipe (Refer to GROUP 14B - Water Hose and Water Pipe <Front>, <Center>, <Rear>), the electric water pump (Refer to GROUP 14B - Water Pump ), the power drive unit (Refer to ), the REMCU (Refer to ), the rear motor assembly (Refer to ) and the on board charger/DC-DC converter (Refer to GROUP 54Dd - On Board Charger (OBC) /DC-DC Converter ). Then go to Step 8.
 
STEP 8. Using scan tool (M.U.T.-IIISE), check the special function.
(1) Execute the following special function (Refer to GROUP 54Da - PHEV-ECU - Special Function, Test ).
  • Item 2: Water pump actuate
(2) When forcibly driving the electric water pump, check that the coolant in the EV radiator condenser tank is flowing.
Is coolant flowing?
Go to Step 9.
Replace the water hose and water pipe (Refer to GROUP 14B - Water Hose and Water Pipe <Front>, <Center>, <Rear>), the electric water pump (Refer to GROUP 14B - Water Pump ), the power drive unit (Refer to ), the REMCU (Refer to ), the rear motor assembly (Refer to ) and the on board charger/DC-DC converter (Refer to GROUP 54Dd - On Board Charger (OBC) /DC-DC Converter ). Then go to Step 7.
 
STEP 9. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
(2) Check the DTC.
Is the DTC set?
Replace the REMCU (Refer to ). Then go to Step 10.
The procedure is complete.
 
STEP 10. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
(2) Check the DTC.
Is the DTC set?
Retry the troubleshooting.
The inspection is complete.