Perkins 1300 EDi Series, Workshop Manual, Page: 218 / 264

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206 Workshop Manual, TPD 1353E, Issue 3
Peregrine EDi and 1300 Series EDi
Sensors
There are four types of sensor in this system: Variable capacitance, Thermistor, Potentiometer and Hall-effect.
Variable capacitance sensors
Variable capacitance sensors are used to measure pressure. Changes in pressure will cause changes to the
signal from the sensor. They are the sensors for:
l
Manifold absolute pressure (MAP)
l
Engine oil pressure (EOP) (A4)
l
Injection control pressure (ICP) (A5)
l
Barometric pressure (BARO) (A8).
If the pressure decreases, the return voltage will decrease. If the pressure increases, the value of the return
voltage will increase.
Thermistors
Thermistors are used to measure temperature. They are the sensors for:
l
Engine oil temperature (EOT) (A3)
l
Coolant temperature (ECT) (A6)
l
Inlet air temperature (IAT) (A9).
Changes in temperature will cause a change in the resistance of the sensor.
If the temperature decreases, the resistance increases and the return voltage will increase. If the temperature
increases, the resistance decreases and the return voltage will decrease.
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