[Previous][Next]
DTC P1024: FEMCU oil temperature too high
 
 
 
 
TROUBLE JUDGMENT
Check Condition
  • The power supply mode of the electric motor switch is ON.
 
 
PROBABLE CAUSES
  • The oil cooling system fails
  • Oil filter clogging
  • Pipe clogging
  • Electric oil pump relay abnormality
  • Electric oil pump related harness abnormality
  • The thermistor oil temperature circuit fails
  • The generator fails
  • Malfunction of the power drive unit (FEMCU)

 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
Check whether the power drive unit [generator control unit (GCU)] set a DTC P105C, P105B or P10AE which is related to the electric oil pump.
Is the DTC set?
Carry out troubleshooting for the DTC P105C, P105B or P10AE (Refer to <DTC P105C>, <DTC P105B>, <DTC P10AE>).
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>).
Go to Step 3.
 
STEP 3. Check the resistance in the oil temperature sensor.
(1) Disconnect the power drive unit connector.
(2) Check the conduction of the harness between the power drive unit and the generator and measure the resistance value of the oil temperature sensor in the power drive unit connector terminals.
 
Terminal symbolNormal value
TH0 to TG0
  • Approx. 400kΩ to 600kΩ at -20°C (-4°F)
  • Approx. 140kΩ to 200kΩ at 0°C (32°F)
  • Approx. 55kΩ to 70kΩ at 20°C (68°F)
  • Approx. 23kΩ to 30kΩ at 40°C (104°F)
Is the check result normal?
Go to Step 4.
Replace the wiring harness (TH0 line, TG0 line) and the generator (Refer to ).
 
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 ).
 
STEP 5. Check the EV oil cooler.
Visually check that there is no abnormality such as a dent or deformation in the fin of the EV oil cooler.
Is the check result normal?
Go to Step 6.
Replace the EV oil cooler (Refer to GROUP 14B - EV oil cooler ).
 
STEP 6. Check the oil level.
Check that the oil level is at the lower edge of the oil level plug hole.
Is the check result normal?
Go to Step 7.
Go to Step 8.
 
STEP 7. Oil filter check
Remove the generator drain plug, check that the oil filter behind it is not clogged or damaged.
Is the check result normal?
Replace the Oil filter and Oil (Refer to GROUP 14B - On-Vehicle Service <Oil Cooling System> - Oil Change ). Then go to Step 10.
Replace the EV oil cooler hose and EV oil cooler pipe (Refer to GROUP 14B - Oil Hose and Pipe ), the EV oil cooler bypass valve and electric oil pump (Refer to GROUP 14B - Electric Oil Pump/EV Oil Cooler Bypass Valve ), the Oil filter and Oil (Refer to GROUP 14B - On-Vehicle Service <Oil Cooling System> - Oil Change ). Then go to Step 10 .
 
STEP 8. Check the oil level.
Check the abnormal state of the oil level.
What is the abnormal state of the oil level?
: Replace the EV oil cooler hose and EV oil cooler pipe (Refer to GROUP 14B - Oil Hose and Pipe ), the EV oil cooler bypass valve and electric oil pump (Refer to GROUP 14B - Electric Oil Pump/EV Oil Cooler Bypass Valve ). Then go to Step 9.
: Remove the oil and replace all oil-cooled parts. (the front motor (Refer to ), the generator (Refer to ), the EV oil cooler (Refer to GROUP 14B - EV Oil Cooler ), EV oil cooler hose and EV oil cooler pipe (Refer to GROUP 14B - Oil Hose and Pipe ) and the EV oil cooler bypass valve and electric oil pump (Refer to GROUP 14B - Electric Oil Pump/EV Oil Cooler Bypass Valve )). Then, inject new oil. (Refer to GROUP 14B - On-Vehicle Service <Oil Cooling System> - Oil Change ). Then go to Step 10.
 
STEP 9. Using scan tool (M.U.T.-IIISE), check the actuator test.
cautionWhen ambient temperature is -15°C (5°F) or less, the oil pump may not operate stably. Execute the actuator test only when the temperature is above -15°C (5°F).
(1) Execute the GCU actuator test below: (Refer to .)
Item No.1: Oil pump
(2) Check for the existence of oil leakage.
Is the oil level appropriate?
Go to Step 10.
Go to Step 6.
 
STEP 10. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Recheck the DTC.
(1) Erase the DTC.
(2) Turn off the power supply mode of the electric motor switch.
(3) Turn on the power supply mode of the electric motor switch.
(4) Check the DTC.
Is the DTC set?
Replace the power drive unit (Refer to ).
The procedure is complete.