Inspection Procedure

HINT:

• If any of DTCs P0115, P0117, P0118 or P0125 are set simultaneously with DTC P0116, the ECT sensor may have an open or a short circuit. Troubleshoot those DTCs first.
• Read freeze frame data using Techstream. The ECM (Included in the hybrid vehicle control ECU) records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0116) 
   1. Connect Techstream to the DLC3.
   2. Turn the power switch on (IG).
   3. Turn the tester on.
   4. Select the following menu items: Powertrain / Engine / Trouble Code.
   5. Read the DTCs.

   Result 

   RESULT CHART
   
   

   Display (DTC Output)	Proceed to
   P0116	A
   P0116 and other DTCs	B

   B:  Go to DTC CHART 

   A: Go to next step 

2. INSPECT THERMOSTAT 
   1. Remove the thermostat (See REMOVAL ).
   2. Measure the valve opening temperature of the thermostat.

      Standard value: 

      80°C to 84°C (176°F to 183°F) 

      HINT:

      In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard.

   3. Reinstall the thermostat (See INSTALLATION ).

   NG: REPLACE THERMOSTAT 

   OK: REPLACE ENGINE COOLANT TEMPERATURE SENSOR