181 / 1003
1.2L REVOTRON ENGINE
170
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 DETAIL
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.