ECTS (Engine Coolant Temperature sensor) is NTC thermister which voltage gets low if the temperature comes to be high. It is installed on cylinder head where coolant passage is in order to sense engine coolant temperature. ECM controls fuel injection adaptation and operating time of preheater with ECTS information. Especially, it is the most important factor to control fuel injection adaptation at cold starting. therefore, it gives influence to cold starting when ECTS is faulty. Furthermore, ECM regards Engine Coolant Temperature as 80℃ then, controls fuel amount when ECTS is faulty and engine is "ON". And, ECM controls fuel injection amount after it regards as -10℃ at cranking. The cooling fan controlled by engine coolant temperature operates constantly with HIGH-MODE prevent engine from overheating during engine "ON" but auxiliary heater does not operates at all.

DTC P0116 is set when the time to increase engine coolant temperature higher than 20℃ is longer than starting under the condition that is engine rpm is over 1000 rpm, fuel amount is over 10 mm/st.

☞ In the case of the next ECM judges ECTS performance error.

1. It takes more than 700sec. until it reaches 0℃ from -20℃ after starting.

2. It takes more than 1000sec. until it reaches 20℃ from 0℃ after starting.

3. It takes more than 2000sec. until it reaches 40℃ from 20℃ after starting.