HEXA

ENGINE

175

5. COOLANT TEMPERATURE SENSOR

This sensor is a made of semi conductor material

(

NTC

) which changes its resistance when exposed

to variable temperature source. Resistance de-

creases as temperature increases. There are two

temp sensors fitted on engine cooling circuit. The

sensor mounted on the upper cooling line is fitted

only in vehicles with manual HVAC and is not fitted

for vehicles with FATC. It provides temperature

signal to the HVAC controller. The sensor mounted

on the outlet elbow provides signal to the EMS. Cor-

rections for injection parameters are done by the

EMS based on coolant temperature to run the en-

gine with maximum efficiency at all temperatures.

LOCATION

1. The sensor which gives signal to EMS is fitted

on upper cooling line.

NOTE

Vehicles fitted with FATC do not need an additional

sensor as it receives the coolant temperature infor-

mation from CAN.

CONNECTOR DETAILS

PIN DETAILS

PIN NO DESCRIPTION

Sensor signal

Sensor return

REMOVAL

1. Remove the engine cover.

2. Drain the coolant. (

Refer Engine Section

)

3. Disconnect the wiring harness connector from

the sensor.

4. Loosen and remove sensor from the upper cool-

ing line.

INSPECTION

EQUIPMENTS REQUIRED



3 ½ Digital Multi-meter (

DMM

)



Water Bath



Heating arrangement for boiling the water

Measurement Set-up showing the water level up to

which the sensor should be dipped.