It will receive input from the ECT sensor indicating an extremely high coolant temperature. The engine coolant (ECT) temperature sensor has two wires in the connector. 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? 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. 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? When I pulled the one sensor, whoever put it in there used RTV and it was clogged at the bottom of the sensor. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem! Disclaimer. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. Coolant temp sensor's wires have an ‘open-circuit’ problem (usually due to a cut wire). 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) . I am sure this is … In other words, a hard start. Terms of Use When the coolant is cold (or ambient temperature), the sensor's internal resistance is higher. I decided since my fan wasnst coming on at 195* which is the temp it should, I switched the locations in the center manifold. 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. After the engine start, coolant temperature begins to rise. 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. This condition leads the PCM to register a P0118 DTC. This decreasing resistance now lets more of the 5 Volts to pass thru' the sensor onto Ground. Chrysler | 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. One is the power wire and this power is in the form of 5 Volts. The PCM senses this voltage drop and translates the specific amount into a temperature reading. I'm guessing, but that is ball-park. voltage to the PCM. Tools | Think safety all of the time. Why, every time I shut the window I hurt somebody’s fingers.”Rodney Dangerfield, Home | A forum community dedicated to 1st generation Chevy Camaros owners and enthusiasts. This temp is usually around -40° F. This condition leads the PCM to set a P0117 DTC. Jeep | Ford | The PCM is able to sense this lower voltage drop and translates the numbers as a higher temperature. When the PCM senses this high voltage input, it will translate this voltage input to a coolant temperature of -46° F (-50° C). When I pulled the one sensor, whoever put it in there used RTV and it was clogged at the bottom of the sensor. 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 According to the Wells replacement parts catalog, the resistance for 100 degrees is about 390 ohms and at 260 degrees, about 102 ohms. 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. Coolant sensor's connector has become unplugged from the sensor itself. When the PCM senses this low voltage input, it will translate this voltage input to a 250° F temperature. For a better experience, please enable JavaScript in your browser before proceeding. © 2011-2020 Abraham Torres-Arredondo 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. I am sure this is my problem about not getting accurate readings. 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. When the coolant is cold (or ambient temperature), the sensor's internal resistance is higher. You can either use a multimeter or a scan tool (w/ Live Data capability) to diagnose the ECT sensor and/or trouble codes. 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. %PDF-1.4 %���� H�T��N�0��. This material may not be reproduced without the author’s consent. 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.
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