SFI SYSTEM, Diagnostic DTC:P0116

DTC Code DTC Name
P0116 Engine Coolant Temperature Sensor 1 Circuit Range / Performance

DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0116 Engine Coolant Temperature Sensor 1 Circuit Range / Performance

DTC Detection Condition


    Enable Criteria (1)

  • Engine running 1000 seconds or more


    Enable Criteria (2)

  • Engine speed higher than 1300 rpm for 20 seconds or higher

  • Idle closed loop control active


    Enable Criteria (3)

  • Engine running


    Malfunction Criteria (1)

  • Engine coolant temperature less than 40°C (104°F)


    Malfunction Criteria (2)

  • Change in engine coolant temperature less than 0.782°C (33.4°F)


    Malfunction Criteria (3)

  • Filtered engine coolant temperature less than 11.9°C (53.42°F)


    Diagnostic Mask

  • The MIL will be illuminated if these faults are present for 2 consecutive trips


    Monitor

  • Continuous


    Potential failure modes

  • Sensor wiring

  • Sensor failure

  • Thermostat failure

  • Thermostat

  • Engine coolant temperature sensor

 Comes on DTC stored

MONITOR DESCRIPTION

The engine coolant temperature sensor is a thermistor device which changes resistance with temperature. As coolant temperature decreases the thermistor resistance value increases, and conversely as coolant temperature increases so the thermistor resistance value decreases.

CAUTION / NOTICE / HINT

Tech Tips


  • If any of DTCs P0117 or P0118 are output simultaneously with DTC P0116, the engine coolant temperature sensor may have an open or a short circuit. Troubleshoot those DTCs first.

  • Read freeze frame data using the GTS. The ECM 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.

  • When the DTC is output, check the engine coolant temperature using the GTS. Enter the following menus: Powertrain / Engine / Data List / All Data / Coolant Temp. If the Coolant Temp value is lower than the actual engine coolant temperature, the engine coolant temperature sensor circuit may be malfunctioning. In this case, check the wire harnesses and connectors (and those connections) between the ECM and the engine coolant temperature sensor first.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0116)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Trouble Codes.

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC P0116 is output A
      DTC P0116 and other DTCs are output B

      Tech Tips

      If any DTCs other than P0116 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  2. INSPECT THERMOSTAT


    1. Inspect the thermostat (thermostat opening temperature).

      Click here

      Tech Tips

      Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    NG

    REPLACE THERMOSTAT Click here