COOLANT TEMPERATURE SENSOR : VI. Component Details : • The temperature sensing circuit uses Thermistor that is sensitive to change in temperature. It has basically the NTC (Negative Temperature Coefficient) means as the temperature increases, the resistance decreases. Component Location : • Coolant temperature sensor is mounted on thermostat housing (before thermostat), which is in contact with the engine coolant and tightened to a specified torque. Preliminary Checks : • Loose/ Damaged Connections between Sensor 1. and EMS ECU. Check for back out of pins at both Sensor 2. connector and ECU connector. Check for damage of pins at both sensor 3. connector and ECU connector. Check the continuity from sensor connector 4. pins to the ECU pins. Connector View : • Connector Details • Component Specification : • The engine coolant temperature sensor measures the temperature of the engine coolant. Coolant temperature sensor is a Negative Temperature Coefficient type Sensor. The sensing element, together with the resistance network in the Engine Management System (EMS) module, provides a signal proportional to the coolant temperature to the EMS module. A reference voltage is provided to the sensor/network by the module. The water temperature sensor, 16TT provides water temperature input to ECU when placed in water stream. The 16TT has negative temperature coefficient with a 2 pin connector, is a semiconductor material which changes resistance depending on the surrounding temperature. The resistance decreases as temperature increases. Water temperature sensor is mounted on cylinder head (before thermostat), which is in contact with the engine coolant and tightened to a specified torque. Sensor Stand alone Diagnosis : • Use multimeter to check for coil resistance across pin 1 and pin 2, which should be between 2500_ at 200C and 833.9_ at 500C. 1. ECU M1D4 :- -ve 2. ECU M1E4 :- +ve CONNECTO R DESCRIPTION 1 Coolant Temp Signal 2 Ground ENGINE 1.2L BSVI PHASE-2 165
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