ZEST BOLT Service Manual

Revotron 1.2T 154 Connector View : 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 thermostat housing (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. Boost Pressure Sensor : Component Details : Boost pressure sensor consists of a silicon chip mounted inside a reference chamber. On one side of the chip is the reference chamber and on the other side is the pressure to be measured. The electrical resistance of the chip varies with the variation of pressure. This change in resistance alters the voltage signal. ECM interprets the voltage signal as pressure and any change in voltage signal as change in pressure. Component Location : Preliminary Checks : 1. Loose/ Damaged Connections between Sensor and EMS ECU. 2. Check for back out of pins at both Sensor connector and ECU connector. 3. Check for damage of pins at both sensor connector and ECU connector.