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Chery T11 Service Manual Electric Injection System 5
3. Coolant Temperature Sensor (THW, CTS) Application: This sensor is used to provide the information about the coolant’s temperature. It can offer an engine’s ECU the water temperature signal which is available to control the startup, idle, ignition timing during the normal operation, and fuel injection pulse width. At the same time, it also offers instruments the water temperature signal which is applied for the water temperature display of the instruments. The water temperature signal is the most signal for the cold start of the engine. During the period of cold start, the fuel injection quantity depends on the signal proved by the water temperature sensor. Structure and Principle: This sensor is a thermistor with negative temperature coefficient (NTC), whose resistance reduces as the coolant temperature rises, and increases as the coolant temperature drops, but it isn’t linear. Based on the output signal from the sensor, the ECU monitors the change of water temperature through its internal comparison circuit. Trouble Diagnosis: 1) The water temperature signal is higher than the limit value; 2) The water temperature signal is lower than the limit value; 3) The open or short circuits of the water temperature sensor. Resistance value data at normal temperature: 2.5±5%KΩ Installation Hint: The max. tightening torque is 20 Nm. Hint: This vehicle is equipped with the three-wire water temperature sensor. This kind of sensor features with the cost-effective and the system consistency.
Profile of a coolant temperature sensor
T11 Water Temperature Sensor
Circuit diagram of coolant temperature sensor Pin: This sensor has three pins in total, which can be exchanged each other. 1) No1 (A) for the sensor grounding wire (to Ecu 5#); 2) No 2 (B) for the water temperature sensor signal wire (to ECU 43#); 3) No 2 (C) for the water temperature gauge of the instruments;
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