TIAGO TIGOR CNG - SERVICE MANUAL

1.2L REVOTRON Bi FUEL CNG ENGINE 170  Connector View :  Connector Details: Connector Description 1 Coolant Temp Signal 2 Ground  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 Use TATA diagnosis tool to check for 'Water Temp' values. Measure the temperature between the Sensor terminals. At room temperature of 35 degrees, the resistance shall be 1763 Ohms. VII. OIL PRESSURE SWITCH  Component Details : Oil Pressure switch is installed on the engine cylinder head to check pressure in oil gallery. If the oil pressure is detected as low, it Switch On the "Low Oil pressure" tell-tale in the Instrument Cluster. This information is very useful for the customer so as to alert him to check the engine oil level in the dip stick and top up the oil to bring it closer to max mark level. This switch is Normally Closed contact type and opens only when oil pressure is above the range of 0.6 to 0.9 Kg/Sq.cm. It has a spring loaded diaphragm which opens up to generate OK signal. Otherwise if pressure is below the designated range, the tell-tale on Cluster gets ON. LOCATION