![]() ![]() ![]() V8 CNG SOHC Naturally Aspiratedĥ.4L 330Cu. V8 BI-FUEL SOHC Naturally Aspiratedĥ.4L 330Cu. V8 GAS SOHC Naturally Aspiratedĥ.4L 330Cu. Harley-Davidson Edition Crew Cab Pickup 4-DoorĤ.6L 281Cu. Depending on how much voltage is being blocked (this is known as a voltage drop), the PCM senses this and translates this into a temperature reading.This part is compatible with 264 vehicle(s) Notes This changing resistance blocks some or a lot of the voltage flowing thru' it. A thermistor is a resistor whose resistance changes with temperature. In a nutshell, the coolant temperature sensor on your Ford vehicle is a thermistor. You're probably itching to get testing and skip this part but I suggest you take a look at it since this section will explain (briefly and in non-tech terms) how the ECT sensor works. Coolant sensor's connector has become unplugged from the sensor itself.Coolant temp sensor's wires have an 'open-circuit' problem (usually due to a cut wire).In technical terms, the PCM is seeing a very high voltage drop across the ECT sensor's circuit, which it translates into an extremely low temperature.This DTC tells you that the PCM is seeing a coolant temperature of -46° F (-50° C).P0118: Engine Coolant Temperature (ECT) Circuit High Input Coolant temp sensor's wires are shorted to each other.Coolant temp sensor's wires are shorted to Ground.This DTC indicates one of several things:.In technical terms, the PCM is seeing a very low voltage drop across the ECT sensor's circuit, which it translates into a very high temperature.This DTC tells you that the PCM is seeing a temperature reading above 250° F (121° C).P0117: Engine Coolant Temperature (ECT) Circuit Low Input. Reports a ‘normal’ temperature, but this temperature does not correspond to the actual coolant temperature.This condition leads the PCM to set a P0117 DTC. It will report an extremely low temperature.This condition leads the PCM to register a P0118 DTC. Usually around 250° F, even tho' the engine is cold. It will report an extremely high temperature.When there's a problem with the ECT sensor, the sensor will do one of the 3 very predictable things: Diagnostic trouble codes P0117 or P0118 stored in the PCM's memory.If the engine coolant temperature (ECT) sensor or its circuits are bad, the first thing you'll see is the check engine light shining nice and bright and: Symptoms Of A Bad Engine Coolant Temp (ECT) Sensor TIP3: Some of my testing suggestions involve tests with the engine running, this means you've got to be on your toes and alert. You don't need a professional $5K (US) scan tool to do it, since a simple generic scan tool will do (don't have a scan tool? Need a scan tool? Check out my recommendation: Actron CP9580 Scan Tool). ![]() TIP2: The fastest, easiest and most pain free way to test the ECT sensor (and codes P0117, P0118) is with a scan tool with Live Data capability. So if your vehicle is overheating, I suggest taking a look at these two tests: How To Test The Thermostat (Ford 3.0L, 3.8L) and/or How To Test For A Blown Head Gasket (Ford 3.0L, 3.8L). TIP1: If you're trying to test an overheating condition on your vehicle, this article won't help you, since a bad engine coolant temperature sensor will NOT cause your vehicle to overheat. It will either be the screw on type or the press in type (held in place by a clip). This article will help you to troubleshoot the engine coolant temperature (ECT) sensor on your Ford 3.0L, 3.8L equipped vehicle.Īs you can see, the engine coolant temperature (ECT) sensor will come in one of two configurations. ![]()
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