Pickup 2WD V6-3137cc 3.1L (CPC) (1991)
/Page-68001.png)
Engine Temperature Sensor: Description and Operation
Engine Coolant Temperature Sensor
PURPOSE
Supplies the ECM with engine temperature information.
LOCATION
In the front of the intake manifold.
OPERATION
The ECM supplies a 5V signal to the sensor and measures voltage variation. By measuring this variation, the ECM measures coolant temperature.
This input is a factor in calculations involving most ECM controlled systems. Low temperature produces high resistance (100K ohms at -40° C /
-40° F) while high temperature produces low resistance (70 ohms at 130° C / 266° F).
CONSTRUCTION
The coolant temperature sensor is a thermistor (a device whose resistance changes with temperature). Being immersed in a coolant passage allows
the sensor to detect engine temperature.
