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INSPECTION PROCEDURE 15: EV system over heat (Water cooling system)
 
 
 
 
COMMENTS ON TROUBLE SYMPTOM
The EV cooling system (water cooling system), the cooling fan or the EV coolant temperature sensor is suspected.
 
 
PROBABLE CAUSES
  • Insufficient or deteriorated motor coolant
  • The cooling fan system fails
  • Malfunction of the water temperature sensor
  • Malfunction of the EV radiator
 
 
 
DIAGNOSIS
Required Special Tools
  • MB991223: Wiring harness set
  • MB992006: Extra fine probe
STEP 1. Motor coolant level check
Refer to GROUP 14B - Motor Coolant Level Check .
Is the check result normal?
Go to Step 2.
Adjust the motor coolant level (between the EV radiator condenser tank "FULL" and "LOW" lines) (Refer to GROUP 14B - Coolant Change ).
 
STEP 2. Using scan tool (M.U.T.-IIISE), check the actuator test. <PHEV-ECU>
Execute the following actuator tests.
  • Item No.3: Radiator fan relay 1 actuate
OK: The actuator test is executed but radiator fan 1 is activated.
  • Item No.4: Radiator fan relay 2 actuate
OK: The actuator test is executed but radiator fan 2 is activated.
Is the check result normal?
Go to Step 3.
Proceed to GROUP 14A - Troubleshooting, Trouble Symptom Procedure "Inspection Procedure 3: Radiator Fan and Condenser Fan do not Operate." (Refer to ).
 
STEP 3. Using scan tool (M.U.T.-IIISE), check the data list. <PHEV-ECU>
Check that the following service data display contents are normal (Refer to ).
  • Item No.82: Water temperature sensor voltage
 
Check conditionNormal condition
The motor coolant temperature is 0°C (32°F)Approximately 3.5 V
The motor coolant temperature is 20°C (68°F)Approximately 2.6 V
The motor coolant temperature is 40°C (104°F)Approximately 1.7 V
The motor coolant temperature is 60°C (140°F)Approximately 1.0 V
Is the check result normal?
Replace the EV radiator (Refer to GROUP 14B - EV radiator/EV radiator condenser rank ).
Check EV water temperature sensor (Refer to ).