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 an intelligent tester. Freeze frame data record the engine condition when malfunctions are detected. 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 an intelligent tester to the DLC3.
   2. Turn the ignition switch to ON.
   3. Turn the tester ON.
   4. Select the following menu items: DIAGNOSIS / ENHANCED II / DTC INFO / CURRENT CODES.
   5. Read the DTC.

      Result 

      RESULT REFERENCE
      
      

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

   B: GO TO  DTC TABLE  

   A: GO TO NEXT STEP 

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

      Standard: 

      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