SFI SYSTEM, Diagnostic DTC:P0116

DTC Code DTC Name
P0116 Engine Coolant Temperature Circuit Range / Performance Problem

DESCRIPTION

Refer to DTC P0115 Click here.

DTC No. DTC Detection Condition Trouble Area
P0116

Engine coolant temperature between -40°C and 60°C (-40°F and 140°F) when engine started, and conditions (a) and (b) met (2 trip detection logic):


  • (a) Vehicle driven at varying speeds (accelerated and decelerated).

  • (b) Engine coolant temperature remains within 3°C (5.4°F) of initial engine coolant temperature.

  • Thermostat

  • Engine coolant temperature sensor

MONITOR DESCRIPTION

The engine coolant temperature sensor is used to monitor the engine coolant temperature. The engine coolant temperature sensor has a built-in thermistor with a resistance that varies according to the temperature of the engine coolant. When the engine coolant temperature is low, the resistance of the thermistor increases. When the temperature is high, the resistance drops. These variations in the resistance are reflected in the output voltage from the engine coolant temperature sensor.

Engine Coolant Temperature Sensor High Side Stuck Monitor

The ECM monitors the sensor voltage and uses this value to calculate the engine coolant temperature. If the sensor voltage output deviates from the normal operating range, the ECM interprets this deviation as a malfunction in the engine coolant temperature sensor and stores the DTC.

Examples:


MONITOR STRATEGY

Required Sensors/Components Engine coolant temperature sensor
Frequency of Operation Once per driving cycle

CONFIRMATION DRIVING PATTERN

A01EVBPE29

  1. Connect the intelligent tester to the DLC3.

  2. Turn the ignition switch to ON and turn the tester on.

  3. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.

  4. Check that the engine coolant temperature is 60°C (140°F) or less.

  5. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

  6. Turn the ignition switch off and wait for 30 seconds.

  7. Turn the ignition switch to ON and turn the tester on [A].

  8. Start the engine and idle it for 5 minutes or more [B].

    Tech Tips

    If the engine coolant temperature does not change by 5°C (9°F) or higher, the engine coolant temperature sensor is malfunctioning. It is not necessary to continue this procedure.

  9. Enter the following menus: Powertrain / Engine and ECT / DTC [C].

  10. Read the pending DTCs.

    Tech Tips


    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  12. Input the DTC: P0116.

  13. Check the DTC judgment result.

    Tester Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform steps [D] and [E].

  14. Drive the vehicle at 40 km/h (25 mph) or more for a total of 5 minutes or more [D].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

    Tech Tips

    In the event of the drive pattern being interrupted (possibly due to factors such as traffic conditions), the drive pattern can be resumed.

  15. Check the DTC judgment result again [E].

    Tech Tips

    If the judgment result shows INCOMPLETE or N/A, perform steps [D] and [E] again.

INSPECTION PROCEDURE

Tech Tips


  • If any of DTCs P0115, P0117 or P0118 are set 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 intelligent tester. 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 intelligent tester. Enter the following menus: Powertrain / Engine and ECT / 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 intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine and ECT / DTC.

    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.


    NG

    REPLACE THERMOSTAT Click here

    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here