Using a scan tool with Live Data capability is the fastest and easiest way to diagnose an ECT sensor but sometimes, you've got to verify the sensor's output directly at the sensor, this section will shed some light on how the ECT sensor works so that, if you have to, you can test it directly with a multimeter.
A simple generic scan tool will do (Don't have a scan tool? These 5 Volts are created inside the PCM. As dnult suggests, lower temp, higher resistance. Terms of Use Come join the discussion about performance, builds, restoration, modifications, classifieds, troubleshooting, reviews, and more!
P0118: Engine Coolant Temperature (ECT) Circuit High Input.
According to the Wells replacement parts catalog, the resistance for 100 degrees is about 390 ohms and at 260 degrees, about 102 ohms. It will receive input from the ECT sensor indicating an extremely high coolant temperature. How Often Should I Change The Spark Plugs (GM 4.3L, 5.0L, 5.7L), 1994 Fuel Pump Circuit Tests (GM 4.3L, 5.0L, 5.7L), 1994 PCM Pin Out Chart (GM 4.3L, 5.0L, 5.7L GAS With A/T), “I came from a real tough neighborhood. Disclaimer. TIP3: Some of my testing suggestions involve tests with the engine running, this means you've got to be on your toes and alert. Usually around 250° F, even tho' the engine is cold. Why, every time I shut the window I hurt somebody’s fingers.”Rodney Dangerfield, Home | Honda | This code is caused by one of the following: Coolant temp sensor's wires are shorted to Ground. The PCM senses this voltage drop and translates the specific amount into a temperature reading.
If memory servers, mine is about 1000 ohms at 70* or so and near 150 at 212*. This temp is usually around -40° F. This condition leads the PCM to set a P0117 DTC. TIP1: A bad engine coolant temperature sensor will not cause your pick up (van, mini-van, or SUV) to overheat. The other wire is the Ground wire. This Ground is provided internally by the PCM too. If your vehicle is overheating, I suggest taking a look at these two tests: TIP2: You'll need a scan tool with Live Data capability to be able to follow the test steps in this article (although you can resistance test the ECT sensor with a multimeter). In cold engine and an ambient temperature of 20 ºC the sensor resistance is between 2000Ω and 3000Ω. When the coolant is cold (or ambient temperature), the sensor's internal resistance is higher. But then again, I have an aftermarket guage / sensor which probably isn't exactly like the factory setup. I've seen them at 5k ohms for 70*F. One thing that I just found, and this may or may not have any bearing on what you are doing....I have two temp sending units, one for a fan and the other for the gauges. Think safety all of the time. ECT gradually heats and its resistance reduces proportionately. Check out my recommendation: Actron CP9580 Scan Tool). The PCM is able to sense this lower voltage drop and translates the numbers as a higher temperature. For a better experience, please enable JavaScript in your browser before proceeding.
The coolant temperature sensor's resistance changes with temperature (this type of sensor is called a thermistor). This article does not cover any type of overheating issue. This higher resistance has a direct impact on the 5 Volts passing thru' it since it blocks some of it from passing thru' to Ground (-this action of blocking voltage from passing thru' is called a voltage drop) . ECT Sensor Test (P0117, P0118) (GM 4.3L, 5.0L, 5.7), Symptoms Of A Bad Engine Coolant Temp Sensor, TEST 1: Checking The Temperature With The Key On Engine Off, TEST 3: Checking The Temperature With The Key On Engine Running. Coolant sensor's connector has become unplugged from the sensor itself. First Generation Camaro Info and Tech - 1967-1969, http://www.chevelles.com/forums/showthread.php?t=53657, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005. The engine coolant (ECT) temperature sensor has two wires in the connector. Need a scan tool? All Rights Reserved. Well, this section will shed some light on this (by the way, you're gonna' see the term voltage drop and I'll explain this term in the next section): P0117: engine coolant temperature (ECT) Circuit Low Input. Chrysler | I'm guessing, but that is ball-park. Coolant temp sensor's wires have an ‘open-circuit’ problem (usually due to a cut wire). In other words, a hard start. You don't need a professional $5K (US) scan tool to do it. Jeep | Reports a ‘normal’ temperature, but this temperature does not correspond to the actual coolant temperature. Does anyone know the procedure for ohming out the temperature gauge, or do you have an extra one you could check the resistance across all the terminals on? You can either use a multimeter or a scan tool (w/ Live Data capability) to diagnose the ECT sensor and/or trouble codes.
Now, in case your wondering., this voltage drop can be measured with a multimeter in Volts DC since it (the meter) would act as a bridge (to Ground) for the voltage being blocked. A forum community dedicated to 1st generation Chevy Camaros owners and enthusiasts. So, if you were using a multimeter, this would mean that the voltage numbers, displayed by the meter, would decrease as the engine's coolant heats up. I am sure this is … Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem! Ford | This higher resistance has a direct impact on the 5 Volts passing thru' it since it blocks some of it from passing thru' to Ground (-this action of blocking voltage from passing thru' is called a voltage drop) .
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