P0116

P0116 ECT SENSOR





Component Description





The engine coolant temperature sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.





[Reference data]






CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

On Board Diagnosis Logic

NOTE:
If DTC P0116 is displayed with P0117 or P0118, first perform the trouble diagnosis for DTC P0117, P0118. P0117.






DTC Confirmation Procedure

NOTE:
If DTC confirmation procedure has been previously conducted, always perform the following before conducting the next step.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, do not fill with the fuel.
1. Start engine and warm it up to normal operating temperature.
2. Rev engine up to 2,000 rpm for more than10 minutes.
3. Move the vehicle to a cool place, then stop engine and turn ignition switch OFF.
4. Check resistance between "fuel level sensor and fuel pump" terminals 3 and 4.
5. Soak the vehicle until the resistance between "fuel level sensor and fuel pump" terminals 3 and 4 becomes 0.5 kOhm(s) higher than the value measured before soaking.

CAUTION:
Never turn ignition switch ON during the soaking time.

NOTE:
Soak time changes depending on ambient air temperature. It may take several hours.
6. Start engine and let it idle for 5 minutes.
7. Check 1st trip DTC.
8. If 1st trip DTC is detected, go to P0116.

Diagnosis Procedure
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Ground Inspection.





OK or NG
OK - GO TO 2.
NG - Repair or replace ground connections.
2.CHECK ENGINE COOLANT TEMPERATURE SENSOR
P0116.
OK or NG
OK - GO TO 3.
NG - Replace engine coolant temperature sensor.
3.CHECK INTERMITTENT INCIDENT
How to Check Terminal and Intermittent Incident.
For Wiring Diagram, Electrical Diagrams.
- INSPECTION END

Component Inspection

ENGINE COOLANT TEMPERATURE SENSOR





1. Check resistance between engine coolant temperature sensor terminals 1 and 2 as shown in the figure.











2. If NG, replace engine coolant temperature sensor.