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.
P0118 is set when the voltage above 4.965V - maximum output voltage of ECTS - is detected for more than 2.0 sec. This code is due to open or short to battery in signal circuit or open in ground circuit.
Item | Detecting Condition | Possible Cause | ||
DTC Strategy | ● Voltage monitoring | ● ECTS circuit ● ECTS component | ||
Enable Conditions | ● IG KEY "ON" | |||
Threshold Value | ● Output signal above the maximum value( above 4.965V ) | |||
Diagnostic Time | ● 2.0 sec. | |||
Fail Safe | Fuel Cut | NO | ● During engine operation : temperature is fixed at 80℃ ● At cold and cranking : temperature is fixed at -10℃ | |
EGR Off | YES | |||
Fuel Limit | NO | |||
Check Lamp | OFF | |||
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㏀ |
