TIAGO TIGOR CNG - SERVICE MANUAL

1.2L REVOTRON Bi FUEL CNG ENGINE 169  Operating Principle : Due to the rotation of a ferromagnetic target wheel in front of the DG the magnetic field of a magnet is modulated at the place of a coil, i.e. with a tooth in front of the DG the magnetic flux through the coil will increase, with a slot it will decrease. This modulation results in changes of the output signal/voltage. The change of the magnetic field causes magnetic induction in a coil by variation of the magnetic flux.  Sensor Stand alone Diagnosis : Use multimeter to check for coil resistance across pin 1 and pin 2, which should be between 300 ohms to 420 ohms Use TATA diagnostic tool to check for engine rpm during cranking. VI. COOLANT TEMPERATURE SENSOR :  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 : 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. 4. Check the continuity from sensor connector pins to the ECU pins.