Coolant Temperature Sensor - SSANGYONG 2004 Rexton 2.7XDi Workshop Manual

DI06-12

Coolant Temperature Sensor

<Coolant Temperature Sensor>
Coolant temperature sensor is a NTC resister that sends coolant temperature to ECU.
NTC resister has characteristics that if the engine temperature rises, the resistance lowers so the ECU detects lowering
signal voltages.
If the fuel injected into the engine through injector has more turbulence, then combusts very well. However, if engine tempera-
ture is too low, the fuel injected as foggy state forms big compounds causing incomplete combustion. So the sensor detects
coolant temperature and changes coolant temperature changes into voltage then sends to ECU to increase the fuel volume
during cold start for better starting. And detects engine overheating for fuel volume reduction to protect the engine.
ECU functions as below with coolant temperature sensor signals.
• When engine is cold, controls fuel volume to correct idle speed
• When engine is overheated, controls electrical fan and A/C compressor to protect the engine
• Sends information for emission control
Temperature
20
50
80
120
Auto amp
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
Temp.
<Output Characteristics of Coolant Temperature Sensor>
NTC 1 Resistance ( Ω Ω Ω Ω Ω )
2,550
826
321
123
<Coolant Temperature Sensor Circuit>
Resistance
Y220_06017
NTC 2 Resistance ( Ω Ω Ω Ω Ω )
6,062
1,800
638
200
Signal
Ground
Y220_06018
COOLING SYSTEM
DI ENG SM - 2004.4