Output Characteristics Of Coolant Temperature Sensor; Circuit Diagram Of Coolant Temperature Sensor - SSANGYONG 2004 Rexton 2.7XDi Workshop Manual

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
temperature 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 (°C)
20
50
80
120
Auto amp
ENGINE CONTROL SYSTEM
DI ENG SM - 2004.4
NTC 1 Resistance (Ω Ω Ω Ω Ω )
2,550
826
321
123
<Circuit diagram of coolant temperature sensor>
Temp.
<Output characteristics of coolant temperature
sensor>
NTC 1 Resistance (Ω Ω Ω Ω Ω )
Ground
DI08-23
Resistance
Y220_08016
6,062
1,800
638
200
Signal
Y220_08017
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN