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gm coolant temp sensor resistance chart

As dnult suggests, lower temp, higher resistance. voltage to the PCM. Tools  |   You don't need a professional $5K (US) scan tool to do it. Check engine light is on and one of the following codes is stored: Extended cranking. One is the power wire and this power is in the form of 5 Volts. This article does not cover any type of overheating issue. I am sure this is my problem about not getting accurate readings. This decreasing resistance now lets more of the 5 Volts to pass thru' the sensor onto Ground. © 2011-2020 Abraham Torres-Arredondo This code indicates that the PCM is seeing a low voltage drop across the ECT sensor, which it's translating as an extremely hot coolant condition. Check out my recommendation: Actron CP9580 Scan Tool). After the engine start, coolant temperature begins to rise. It will receive input from the ECT sensor showing an extremely low temperature. Ford  |   Very true, the sensor body needs a good ground to the host item. Think safety all of the time. JavaScript is disabled. When the PCM senses this low voltage input, it will translate this voltage input to a 250° F temperature. Honda  |   A simple generic scan tool will do (Don't have a scan tool? This material may not be reproduced without the author’s consent. %PDF-1.4 %���� Coolant sensor's connector has become unplugged from the sensor itself. I am sure this is … According to the Wells replacement parts catalog, the resistance for 100 degrees is about 390 ohms and at 260 degrees, about 102 ohms. But then again, I have an aftermarket guage / sensor which probably isn't exactly like the factory setup. When the coolant is cold (or ambient temperature), the sensor's internal resistance is higher. The PCM senses this voltage drop and translates the specific amount into a temperature reading. The following table will help you to see this temperature to resistance relationship: OK, enough of the working theory, let's get testing in the next page. TIP1: A bad engine coolant temperature sensor will not cause your pick up (van, mini-van, or SUV) to overheat. 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) . 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. This article will help you to troubleshoot the engine coolant temperature (ECT) sensor on your GM 4.3L, 5.0L, or 5.7L equipped pick up, van, mini-van or SUV. Coolant temp sensor's wires are shorted to each other. This code is caused by one of the following: Coolant temp sensor's wires are shorted to Ground. Come join the discussion about performance, builds, restoration, modifications, classifieds, troubleshooting, reviews, and more! Unload Resistance-Temperature Characteristic Chart 1 10 100 1000 10000 100000 Temperature (°C) Sensor Resistance (Ω) Temperature Accuracy Chart-2-1.5-1-0.5 0 0.5 1 1.5 2-40 -25 -10 5 20 35 50 65 80 95 110 125 140 Temperature (°C) Accuracy (°C) Title: air_temp.xls Author: Brian Lewis Do NOT follow this link or you will be banned from the site! For a better experience, please enable JavaScript in your browser before proceeding. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem! 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. Reports a ‘normal’ temperature, but this temperature does not correspond to the actual coolant temperature. 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) . 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). You can either use a multimeter or a scan tool (w/ Live Data capability) to diagnose the ECT sensor and/or trouble codes. ECT gradually heats and its resistance reduces proportionately. When I pulled the one sensor, whoever put it in there used RTV and it was clogged at the bottom of the sensor. All Rights Reserved. When the PCM senses this high voltage input, it will translate this voltage input to a coolant temperature of -46° F (-50° C). If memory servers, mine is about 1000 ohms at 70* or so and near 150 at 212*. It will receive input from the ECT sensor indicating an extremely high coolant temperature. These 5 Volts are created inside the PCM. When I pulled the one sensor, whoever put it in there used RTV and it was clogged at the bottom of the sensor. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. I decided since my fan wasnst coming on at 195* which is the temp it should, I switched the locations in the center manifold. H�T��N�0��. 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. The engine coolant (ECT) temperature sensor has two wires in the connector. 1 0 obj << /S /D >> endobj 2 0 obj << /Nums [ 0 1 0 R ] >> endobj 3 0 obj << /Type /Pages /Kids [ 54 0 R 8 0 R ] /Count 2 >> endobj 4 0 obj << /CreationDate (D:20030807023427Z) /ModDate (D:20030806223623-03'00') /Producer (Acrobat Distiller 5.0 \(Windows\)) /Author (Brian Lewis) /Creator (PScript5.dll Version 5.2) /Title (air_temp.xls) >> endobj 7 0 obj << /Type /Catalog /Pages 3 0 R /Metadata 98 0 R /PageLabels 2 0 R >> endobj 8 0 obj << /Type /Page /Parent 3 0 R /Resources 9 0 R /Contents [ 20 0 R 24 0 R 26 0 R 28 0 R 30 0 R 32 0 R 36 0 R 38 0 R ] /MediaBox [ 0 0 612 792 ] /CropBox [ 0 0 612 792 ] /Rotate 0 >> endobj 9 0 obj << /ProcSet [ /PDF /Text /ImageB ] /Font << /TT1 33 0 R /TT2 13 0 R /TT4 12 0 R /TT5 16 0 R /TT6 17 0 R /TT8 21 0 R >> /XObject << /Im1 50 0 R >> /ExtGState << /GS1 51 0 R >> /ColorSpace << /Cs6 18 0 R >> >> endobj 10 0 obj << /Filter /FlateDecode /Length 227 >> stream 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. 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. Disclaimer. When the coolant is cold (or ambient temperature), the sensor's internal resistance is higher. A forum community dedicated to 1st generation Chevy Camaros owners and enthusiasts. 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? In other words, a hard start. The coolant temperature sensor's resistance changes with temperature (this type of sensor is called a thermistor). As the engine warms up, the coolant starts to heat up, which in turn causes the coolant temp sensor's resistance to decrease. 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. The other wire is the Ground wire. 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. Bosch 1 bar tmap map basemap page 2 g4 link vdo coolant temperature sender 120 c m14 getting rid of the 02 sensor pipeAnybody Have An Ohms Vs Temp Table For A Gm Coolant SensorGm Ect And Iat Temperature Sensor Resistance Chart Ford13f2 Gm Coolant Temp Sensor Wiring LibraryFord Coolant Temperature Sensor Ect Resistance Chart4l60e… Read More » P0118: Engine Coolant Temperature (ECT) Circuit High Input. The PCM is able to sense this lower voltage drop and translates the numbers as a higher temperature. 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. I'm guessing, but that is ball-park. GM  |   Coolant temp sensor's wires have an ‘open-circuit’ problem (usually due to a cut wire). Usually around 250° F, even tho' the engine is cold. Terms of Use This temp is usually around -40° F. This condition leads the PCM to set a P0117 DTC. This code indicates that the PCM is seeing a high voltage drop across the ECT sensor, which it's translating as an extremely hot coolant condition. I decided since my fan wasnst coming on at 195* which is the temp it should, I switched the locations in the center manifold. Engine coolant temperature sensors can be either a negative temperature coefficient (NTC) design where they provide high resistance when they are cold, and resistance drops as they heat up, or a positive temperature coefficient (PTC) where they provide low resistance when they are cold. Chrysler  |   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. At 90 ºC its resistance is in the range of 200Ω to 300Ω. Why, every time I shut the window I hurt somebody’s fingers.”Rodney Dangerfield, Home  |   This condition leads the PCM to register a P0118 DTC. TIP3: Some of my testing suggestions involve tests with the engine running, this means you've got to be on your toes and alert. This Ground is provided internally by the PCM too. Jeep  |   Need a scan tool? In cold engine and an ambient temperature of 20 ºC the sensor resistance is between 2000Ω and 3000Ω. The are several symptoms a bad ECT sensor causes, and they are: When there's a problem with the ECT sensor or its circuits, the PCM will see one of the three distinct conditions: You've probably seen the official OBD-II description of these two diagnostic trouble codes but in plain English what are these two codes saying?

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