HEXA

ENGINE 175 5. COOLANT TEMPERATURE SENSOR This sensor is a made of semi conductor material ( NTC ) which changes its resistance when exposed to variable temperature source. Resistance de- creases as temperature increases. There are two temp sensors fitted on engine cooling circuit. The sensor mounted on the upper cooling line is fitted only in vehicles with manual HVAC and is not fitted for vehicles with FATC. It provides temperature signal to the HVAC controller. The sensor mounted on the outlet elbow provides signal to the EMS. Cor- rections for injection parameters are done by the EMS based on coolant temperature to run the en- gine with maximum efficiency at all temperatures. LOCATION 1. The sensor which gives signal to EMS is fitted on upper cooling line. NOTE Vehicles fitted with FATC do not need an additional sensor as it receives the coolant temperature infor- mation from CAN. CONNECTOR DETAILS PIN DETAILS PIN NO DESCRIPTION 1 Sensor signal 2 Sensor return REMOVAL 1. Remove the engine cover. 2. Drain the coolant. ( Refer Engine Section ) 3. Disconnect the wiring harness connector from the sensor. 4. Loosen and remove sensor from the upper cool- ing line. INSPECTION EQUIPMENTS REQUIRED  3 ½ Digital Multi-meter ( DMM )  Water Bath  Heating arrangement for boiling the water Measurement Set-up showing the water level up to which the sensor should be dipped.