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1.2L REVOTRON ENGINE
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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.