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

When either of the following conditions is met (2 trip detection logic).


  • During engine warm up after cold engine starts, change in engine coolant temperature sensor output is below threshold

  • In duration between warmed engine stopped and next cold engine starts, change in engine coolant temperature sensor output below threshold

  • Thermostat

  • Engine coolant temperature sensor

MONITOR DESCRIPTION

Engine Coolant Temperature Sensor Cold Start Monitor

The monitor runs when the engine is started cold. If the change in engine coolant temperature sensor output until the engine is warmed up completely is less than the threshold, it is determined that a malfunction has occurred in the engine coolant temperature sensor. When this is detected in 2 consecutive driving cycles, the MIL is illuminated and the DTC is stored.

Engine Coolant Temperature Sensor Soak Monitor

The ECM compares the engine coolant temperature when the fully warmed up engine is stopped and when the engine is started on the next trip when 5 hours or more has elapsed since the engine was stopped. If the change in engine coolant temperature sensor output is less than the threshold, it is determined that a malfunction has occurred in the engine coolant temperature sensor. When this is detected in 2 consecutive driving cycles, the MIL is illuminated and the DTC is stored.

MONITOR STRATEGY

Related DTCs

P0116: Engine coolant temperature sensor rationality (cold start monitor)

P0116: Engine coolant temperature sensor rationality (soak monitor)
Required Sensors/Components (Main) Engine coolant temperature sensor
Required Sensors/Components (Related) -
Frequency of Operation Once per driving cycle
Duration

10 seconds: Soak monitor

-: Cold start monitor
MIL Operation 2 driving cycles
Sequence of Operation None

TYPICAL ENABLING CONDITIONS

All
Monitor runs whenever the following DTCs are not stored None
Cold Start Monitor
All of the following conditions are met -
Auxiliary battery voltage 10.5 V or higher
Time after engine start 1 second or more
Engine coolant temperature at engine start Less than 60°C (140°F)
Soak time 0 seconds or more
Accumulated mass air flow 2350 g or more
Fuel cut Off
Intake air temperature sensor circuit fail (P0112, P0113) Not detected
Engine coolant temperature sensor circuit fail (P0115, P0117, P0118, P0125) Not detected
Engine water pump circuit fail (P261B, P261C, P261D) Not detected
Thermostat fail (P0128) Not detected
Difference between engine coolant temperature at engine start and intake air temperature Less than 40°C (72°F)
Soak Monitor
All of the following conditions are met -
Auxiliary battery voltage 10.5 V or higher
Engine Running
Soak time 5 hours or more
Either of the following conditions is met 1 or 2
1. Engine coolant temperature 60°C (140°F) or higher
2. Accumulated mass air flow 5732 g or more
Intake air temperature sensor circuit fail (P0112, P0113) Not detected
Engine coolant temperature sensor circuit fail (P0115, P0117, P0118, P0125) Not detected
Engine water pump circuit fail (P261B, P261C, P261D) Not detected
Thermostat fail (P0128) Not detected
Soak timer fail (P2610) Not detected

TYPICAL MALFUNCTION THRESHOLDS

Cold Start Monitor
Engine coolant temperature sensor value change Less than 5°C (9°F)
Soak Monitor
Difference between current engine coolant temperature sensor value and previous engine coolant temperature sensor value when engine stopped Less than 5°C (9°F) (varies with engine coolant temperature of last trip engine stop)

COMPONENT OPERATING RANGE

Engine coolant temperature Engine coolant temperature sensor value changes in accordance with actual engine coolant temperature

CONFIRMATION DRIVING PATTERN

A01I2X0E30

  1. Connect the Techstream to the DLC3.

  2. Turn the power switch on (IG) and turn the Techstream on.

  3. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / 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 power switch off and wait for at least 30 seconds.

  7. Turn the power switch on (IG) and turn the Techstream on [A].

  8. Put the engine in inspection mode (maintenance mode) Click here.

  9. 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.

  10. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].

  11. 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.

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

  13. Input the DTC: P0116.

  14. Check the DTC judgment result.

    Techstream 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].

  15. 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.

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

    Tech Tips

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

  17. If no pending DTC is output, perform a universal trip and check for permanent DTCs Click here.

    Tech Tips


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

    • If no permanent DTC is output, the system is normal.

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 Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

  • When the DTC is output, check the engine coolant temperature using the Techstream. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / 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 Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Enter the following menus: Powertrain / Engine and ECT / 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 operating temperature) Click here.

      Tech Tips

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


    NG

    REPLACE THERMOSTAT Click here

    OK

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here