P0116

1UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0116: Engine Coolant Temperature Circuit Range / Performance Problem
P0116 - Engine Coolant Temperature Circuit Range / Performance Problem

DESCRIPTION

Refer to DTC P0115 P0115.





MONITOR DESCRIPTION

ECT sensor cold start monitor

When a cold engine start is performed and then the engine is warmed up, if the ECT sensor value does not change, it is determined that a malfunction has occurred. If this is detected in 2 consecutive driving cycles, the MIL is illuminated and a DTC is set.

ECT sensor soak monitor

If the ECT sensor value does not change after the warmed up engine is stopped and then the next cold engine start is performed, it is determined that a malfunction has occurred. If this is detected in 2 consecutive driving cycles, the MIL is illuminated and a DTC is set.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

ECT Sensor cold start monitor:





ECT Sensor soak monitor:





TYPICAL MALFUNCTION THRESHOLDS

ECT Sensor cold start monitor:





ECT Sensor soak monitor:





COMPONENT OPERATING RANGE





CONFIRMATION DRIVING PATTERN





1. Connect the Techstream to the DLC3.

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

3. Enter the following menu items: Powertrain / Engine / Data List / Coolant Temp.

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

5. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) Reading and Clearing Diagnostic Trouble Codes.

6. Turn the engine switch off and wait for at least 30 seconds.

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

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

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

9. Enter the following menus: Powertrain / Engine / Trouble Codes / Pending.

10. Read the pending DTCs [C].

HINT
- 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 / Utility / All Readiness.

12. Input the DTC: P0116.

13. Check the DTC judgment result.





HINT
If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [D] and [E].

14. Drive the vehicle at 25 mph (40 km/h) 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.

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

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

HINT
If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [D] and [E] again.

16. If no pending DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.

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 the Techstream. Freeze frame data records 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.

PROCEDURE

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

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Trouble Codes.

(e) Read the DTC.

Result:





B -- GO TO DTC CHART SFI System
A -- Continue to next step.

2. INSPECT WATER INLET WITH THERMOSTAT

(a) Remove the water inlet with thermostat Removal.

(b) 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.

(c) Reinstall the water inlet with thermostat Installation.

NG -- REPLACE WATER INLET WITH THERMOSTAT Removal

OK -- REPLACE ENGINE COOLANT TEMPERATURE Removal