Engine Coolant Temperature Sensor(ECTS), installed in coolant line, senses engine coolant temperature. With the information about engine coolant temperature, ECM performs fuel injection quantity correction, cooling fan control and glow relay operating duration control.
Especially, because ECTS signal is main variable of fuel injection quantity correction when engine is cold, sensor trouble makes starting engine difficult when engine is cold.
If engine is running when ECTS is out of order, ECM considers engine coolant temperature as 80℃. And during cranking, ECM considers engine coolant temperature as -10℃. Besides, cooling fan, which is controlled based on ECTS signal, operates at HIGH-MODE to prevent engine from being overheated and supplementary heater is deactivated.
P0116 is set when engine coolant temp. rise is below 5℃ within certain duration after engine ON when engine coolant termp. is below 35℃ in condition of above 1000RPM and 11mg/hub of fuel injection quantity. (e.g. duration at 0℃ of engine coolant temp. - 460 sec.)
Item | Detecting Condition | Possible Cause | ||
DTC Strategy |
•
Voltage monitoring |
•
ECTS circuitcuit
•
ECTS component | ||
Enable Conditions |
•
Engine running | |||
Threshold Value |
•
Engine coolant termp. rise is below 5℃ | |||
Diagnostic Time |
•
460 sec. at 0℃ of engine coolant temp. | |||
Fail Safe | Fuel cut | NO |
•
A/C condensor fan control operation based on engine coolant temperature inhibited.
•
PTC heater inhibited.
•
Cooling fan is fixed at HIGH-MODE.
•
during engine operation : temperature is fixed at 80℃ at cold and cranking : temperature is fixed at -10℃ | |
EGR Off | NO | |||
Fuel Limit | NO | |||
Check Lamp | YES | |||
Temperature | '- 40℃ | '- 20℃ | 0℃ | 20℃ | 40℃ |
Resistance | 48.14㏀ | 15.48±1.35㏀ | 5.790㏀ | 2.45±0.14㏀ | 1.148㏀ |
Temperature | 60℃ | 80℃ | 100℃ | 110℃ | 120℃ |
Resistance | 0.586㏀ | 0.322㏀ | 0.188㏀ | 0.147±0.002㏀ | 0.116㏀ |
Fig.1) ECTS output signal at 80℃.The higher temperature rises, the lower signal voltage becomes.
