ARIA

ENGINE

173

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 decreas-

es 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 vehi-

cles with FATC. It provides temperature signal to the

HVAC controller. The sensor mounted on the outlet

elbow provides signal to the EMS. Corrections for

injection parameters are done by the EMS based on

coolant temperature to run the engine 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.