Need to knw where the coolant temperature sending un it is located on my 2001 f150

Not low input sensor...P0117 KIA - Engine Coolant Temperature Sensor 1 Circuit Low Input

Possible causes
Low engine coolant level
Faulty Engine Coolant Temperature (ECT) sensor
Faulty engine coolant thermostat
Engine Coolant Temperature (ECT) sensor harness is open or shorted
Engine Coolant Temperature (ECT) sensor circuit poor electrical connection

Just replace coolant temperature sending unit....

Follow the upper rad hose to the thermostat housing. It will be there. There are two, one is the ECT (engine coolant temperature SENSOR) and the other is the temperature SENDING UNIT (input for temp. gauge ONLY).

The alternator needs to be removed to easily access and locate coolant temperature sensor.For more details and ECT diagram on 2001 dodge ram click the link below and follow the details to replace the coolant sensor:-----

http://technoanswers.blogspot.com/2012/10/dodge-coolant-temperature-sensor.html
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These details will help.
Thanks.

As with all engine codes there is no one solution fits all, here is the info on the code from the diagnostic material.
P0118 - Engine Coolant Temperature Circuit High Input
Possible causes - Low engine coolant level
- Engine Coolant Temperature (ECT) sensor harness is open or shorted
- Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
- Faulty Engine Coolant Temperature (ECT) sensor
- Faulty engine coolant thermostat P0118 Description The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

You have 2 seperate engine temp sensors....
1) coolant temperature sensor, which is located next to the water outlet on top of the engien where the upper radiator hose connects. This coolant temp signal is used by the powertrain control module to control such things as fuel mixture, transmission shift points, and cooling fan operation when the engine is hot. If this sensor has failed in such a way that the PCM thinks that the engine is cold, it should also be running very rich (black smoke from the tail pipe, rough idle, very poor fuel economy).
2)Cylinder Head Temperature sensor..You probably cannot see this one, as it is located on the head underneath the intake manifold. You have to Remove the intake manifold to get to this part...Sometimes you can get by just changing the thermostat ...If it is faulty it will show as a sensor..
Anywho they usually twist out ond in..Always make sure you diconnect the battery while working with electronics....
If it is giving a P0125 code this is usually caused by a thermostat that is worn out..

it does not have one if you have a 4.6 engine

ECT sensor controls the computer, engine coolant temperature sender controls the gauge. 5.0? 5.8? 4.9? Then I can tell you where it is.

The Coolant Temperature Sensor is located under hood, center, front engine area, rear of water outlet, mounted in intake manifold.

Hope helped (remember rated this help) Good luck.

please rate as fixya if this helps

SECTION 303-14: Electronic Engine Controls 2000 F-150 Workshop Manual
REMOVAL AND INSTALLATION Engine Coolant Temperature (ECT) Sensor — 4.6L and 5.4L Removal and Installation

1. Remove the engine coolant temperature (ECT) sensor.
   1. Disconnect the electrical connector.
   1. Remove the ECT sensor.

The ECT sensor:

• sends the PCM a signal indicating engine temperature.
• resistance decreases as coolant temperature increases.

The ECT measures the temperature of the engine coolant. The sensor is threaded into an engine coolant passage.

temp control for cooloing system or heater sysem?

ECT - Engine Coolant Temperature Sensor

The engine coolant temperature (ECT) sensor (Figure 27) is a thermistor device in which resistance changes with temperature. The electrical resistance of a thermistor decreases as the temperature increases, and increases as the temperature decreases. The varying resistance affects the voltage drop across the sensor terminals and provides electrical signals to the PCM corresponding to temperature.
Thermistor-type sensors are considered passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow.
Voltage that is dropped across a fixed resistor in a series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.
The ECT measures the temperature of the engine coolant. The sensor is threaded into an engine coolant passage. The ECT sensor is similar in construction to the IAT sensor.
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