CTS
CTS means Coolant Temperature Sensor. It measures the coolant temperature and sent signal voltage to ECU.
Measure the resistance between the terminals.
 |
| T=40deg |
 |
| T=55deg |
 |
| T=60deg |
 |
| T=65deg |
 |
| T=70deg |
 |
| T=74deg |
 |
| T=76deg |
 |
| T=80deg |
| Water Temperature ( Degree ) | Resistance ( KR ) |
| 40 | 1.01 |
| 55 | 0.63 |
| 60 | 0.53 |
| 65 | 0.45 |
| 70 | 0.37 |
| 74 | 0.33 |
| 76 | 0.31 |
| 80 | 0.26 |
The graph:
The specification:
The sensor match the specifications. The temperature increase, resistance decrease. So the CTS is the NTC-Negative Temperature Coefficient thermistor.
The internal circuit shows below
The resistor in the CTS and pull up resistor in series circuit and 5V power supply. The temperature changes and the resistance in CTS changes,so the available voltage as the signal output changes.
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