how to test engine coolant temperature sensor

The one wire sensor in the back sends temp readings to … This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. A small terminal coming out of the block itself will become visible. Your email address will not be published. The sensor unit allows a current, varying with the engine temperature, through to a heater coil inside the gauge. Just open the latch of the hood and hold it open. Depending on the problem you are … If you were recently driving your vehicle, wait about 15 minutes to let your engine cool down so you don’t burn yourself. Remember, connecting the right way is important. This can be any solid piece of metal. The reading should be 2000 ohm approx. Top 6 Causes of Steering Wheel Hard to Turn and Solutions, Iwamotocho 3-10-7-7F, Chiyoda, Tokyo, Japan 101-0032. You’ll need a professional to remove the intake plenum without damaging your engine. Coolant temp sensor's wires are shorted to Ground. Thanks to all authors for creating a page that has been read 8,341 times. Now, take the red lead and connect it to the terminal end of the, Pay attention to what you should be seeing on the digital meter. The coolant temperature sensor informs the engine control unit about the operating temperature of the engine, so that the fuel quantity and ignition point can be adapted accordingly. Coolant temperature sensor testing - symptoms, cause of failure & troubleshooting. Tsukasa Azuma is an awesome car blogger of Car From Japan. Attach the black lead of the volt-ohm meter to the body of the cold sensor (this is before turning the engine on). Testing the sensor isn’t difficult. Stephen Pender, Australia; Fantastic products and support with unbelievable performance for the money. wikiHow's Content Management Team carefully monitors the work from our editorial staff to ensure that each article is backed by trusted research and meets our high quality standards. A bi-metallic strip inside the coil bends by an amount depending on the size of the current and deflects the needle across a calibrated scale to give a temperature reading. This DTC tells you that the PCM is seeing a coolant temperature of -46° F (-50° C). In order for a diagnosis, the ignition is switched off and the coolant temperature sensor connector is disconnected. If you really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. Here you will find useful basic information and important tips relating to the coolant temperature sensor in vehicles. The situation above points to a bad engine coolant temperature sensor (ECT). Depending on the sensor information, the control unit adapts the injection time and firing angle to the operating conditions. If the leads are touching you won’t get an accurate reading. Many inexpensive shop manuals tell you to test an engine coolant temperature sensor using an ohmmeter. With the float all the way down, the resistance across the contacts should be zero. If the reading is not way lower than 2000ohm, you have a broke, 7 Things You Need To Consider Before Choosing A Cargo Carrier. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Keep in mind that many (ECT) sensor problems are more often due to; wiring faults and loose or corroded connectors than failure of the sensor itself. This article applies to the Dodge Ram 2nd Generation (1994-2001). Peep in the middle of the pulleys at the front of the block. Coolant Temperature Sensor test for the Jeep Wrangler YJ. Unplug the electrical connection to the switch with your hands, revealing two posts on the sensor. In terms of resistance capacity, this coolant sensor has 20,000 ohms at 248 degrees Fahrenheit. This dictates the dynamics of how the engine will work. Try taking another reading, if you still don’t get anything, your sensor may be broken and needs to be replaced. The computer will send another signal to the engine temperature gauge, and alert the driver if the temperature exceeds the specified range for that vehicle. Engine coolant temperature sensor. Connect the positive wire of the voltmeter is to the … This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\n<\/p><\/div>"}, How to Test a Temperature Sensor with a Multimeter, https://www.backyardmechanic.org/how-to-test-and-replace-an-engine-temperature-sensor/, consider supporting our work with a contribution to wikiHow. SEE MORE. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. There are 11 references cited in this article, which can be found at the bottom of the page. The onboard computer uses the signal of ECT as the main correction factor when calculating the ignition advance and the injection duration. Reconnect the connector to the sensor. Here is how you must connect the meter to the sensor. This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. Now, with these temperature sensors, the process is more automated, and the engine runs smoothly without freezing off in the winter and overheating in the summer. PCM is bad. Luckily, replacing a temperature sensor is as simple as plugging in a new one. The temperature is then sent to the on-board control system. Don’t ignore the following signs– Fuel Consumption Increases. Most pro’s test actual voltage coming out of the engine coolant temperature sensor. Coolant temperature sensor testing - symptoms, cause of failure & troubleshooting. If it doesn't, then you either have a bad sensor, bad fan, or a problem with the ecm. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. Most (ECT) sensors operate using electrical resistance, to measure the temperature of the coolant. Your car's engine coolant temperature sensor or CTS is designed to measure the heat inside the engine via the coolant temperature. Unscrew the air cleaner cover bolt, and un-clip the airbox to set it aside. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. How to Test Coolant. Faulty Coolant Temperature Sensor – 4 Common Symptoms. You will need to remove the intake piping to find them. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. The value of this sensor can be measured without serious disassembly of the bike. In fact, if you have a good understanding of the terminals, you can even, Here is how you must connect the meter to the sensor. Set your digital multimeter to DC volts at 20 volts or less. Coolant temp sensor's wires are shorted to Ground. It lets you see what you previously had to guess was happening. Ways to test the engine coolant temperature sensor. If you see that the difference is not more than 200, you are dealing with a faulty, Attach the black lead of the volt-ohm meter to the body of the cold sensor (this is before turning the engine on). A bad engine coolant temperature sensor affects engine performance: It may cause a constant lean air/fuel mixture, causing the engine to stall or idle rough. A small terminal coming out of the block itself will become visible. Testing the K bike temperature sensor: The temperature sensor on the K bike control the mixture of the bike in relationship to the engine coolant temperature. If it starts, that’s a pretty good sign the sensor is off. Therefore, A visual inspection of the (ECT) sensor will sometimes reveal a problem. This blogs instructs you on how to. A typical (ECT) sensor is a Negative Temperature Coefficient (NTC) thermistor. The reading should be 2000 ohm approx. Be careful not to burn yourself with the boiling water. That’s why pumping the gas pedal keeps your engine running. That’s why pumping the gas pedal keeps your engine running. Name * Email address * Comment * Scroll. The coolant temperature sensor is fastened to the intake manifold of an engine coolant and is often referred to as a negative temperature coefficient type of sensor. Coolant temp sensor's wires are shorted to Ground. The engine coolant temperature (ECT) sensor test is simple and can help you fix your car faster. It is a two-wire thermistor immersed in coolant and measures its temperature. To properly test the coolant sensor, you'll need a multimeter that can test for resistance, most do. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. BWD® offers top-performing and durable coolant temperature sensors that are critical to many PCM functions. Use a drop light if you need better vision into the engine block. Use a drop light if you need … Download coolant temperature sensor measurement. Then there is another at the back drivers topside of the engine cylinder head just to the right of the valve cover, this one has one wire. Start by checking for coolant leaks, if there are not leaks the thermostat might be stuck open or closed and may need to be replaced, you still have an issue the engine coolant temp sensor or cylinder head temp sensor. Appearance The ECT sensor is shown on fig. Unlike Your Steering Wheel in Seconds with These Two Tricks; How to Paint Your Car Wheels Like a Pro; Step 1: Locating the Coolant Temperature Sensor. Measure the resistance across the terminal pins using a digital multimeter and write this value down. Don’t ignore the following signs– Fuel Consumption Increases. The fan should come on automatically. Most coolant temperature sensors operate using electrical resistance to measure the temperature of the coolant. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. If you don’t have one, odds are that one of your neighbors might. Here is another of our maintenance tips that help you maintain your car better. Put your vehicle in park so it’s stable and won’t roll, and take the key out of the ignition so you won’t accidentally shock yourself. Guided test: Engine coolant temperature sensor - Simtec (GM) type. Figure 3: Lab scope measurement of coolant temperature sensor. Coolant temp sensor's wires are shorted to each other. Fig. Begin with a cold engine. To test the sensor, just disconnect the wire from it while the engine is running. P0118: Engine Coolant Temperature (ECT) Circuit High Input. Car Transmission Types and Their Functions, How to Fix Low Compression in One Cylinder. engine temperature sensor open or short circuit test - continued Field Maintenance Manual 1 For Loader, Heavy, Scoop: Diesel Engine Driven (Ded), 4-Wheel Drive 4.5 Cubic Yard Rock Bucket And 5.0 Cubic Yard General Purpose Bucket Just open the latch of the hood and hold it open. It is a NTC (Negative Temperature Coefficient) sensor, ie, as the temperature rises – the value decreases. Name * Email address * Comment * Scroll. Your car’s coolant temp sensor, which you may also know as a coolant temp switch, is part of your engine’s management system. We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. Disconnect the connector from the coolant temperature sensor (temperature sending unit). Locate the coolant temperature sensor in your vehicle by referring to the service manual. Unlike Your Steering Wheel in Seconds with These Two Tricks; How to Paint Your Car Wheels Like a Pro; Step 1: Locating the Coolant Temperature Sensor. If it thinks the engine should make any changes, it sends a signal that tells the engine to optimize for better performance. You will see a wire lead coming out of the terminal. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. This sensor keeps track of the overall temperature of the coolant in your engine. Moreover, because of being passionate to learn about the recent happenings in auto industry, he doesn’t only provide great car maintenance tips, he also always updates latest trends in among car brands and share them in his own interesting viewpoint. Testimonials . It is situated under the hood on the engine block. Go to the drop down menu in the lower left corner of the Waveform Library window and select, Coolant temperature sensor. Engine Coolant Temperature (ECT) Voltage – Testing. Where is the CTS sensor located? Open up your hood so you’re able to access your engine compartment and make sure it stays open. You can then take preventative means, such as blocking off part of the radiator or changing the thermostat. There is an inverse relationship between the electrical resistance and the engine coolant (i.e. Tip: If you’re having trouble finding the sensor, check your owner’s manual or look up your make and model online to find where it’s located. This signal is then sent to the computer so … Last Updated: June 1, 2020 Coolant temp sensor's wires are shorted to Ground. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/4\/4d\/Test-a-Temperature-Sensor-with-a-Multimeter-Step-01.jpg\/v4-460px-Test-a-Temperature-Sensor-with-a-Multimeter-Step-01.jpg","bigUrl":"\/images\/thumb\/4\/4d\/Test-a-Temperature-Sensor-with-a-Multimeter-Step-01.jpg\/aid11918517-v4-728px-Test-a-Temperature-Sensor-with-a-Multimeter-Step-01.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"

\u00a9 2020 wikiHow, Inc. All rights reserved. On both the V6 4.3 L Vortec engine and the 4.8 L, 5.3 L and 6.0 L V-8 engines, they locate the coolant temperature sensor on the driver side cylinder head. Be careful not to burn your fingers in the hot water. This sensor is the mechanism that is responsible for telling the car’s computer the precise running temperature of the engine. The sensor(s) thread into the in intake manifold on either side of the thermostat housing, behind the alternator. The Best TOAD Vehicles for Frequent Campers. SEE MORE. PicoScope is the most simple yet complex tool in my workshop for diagnostic use. Locate the coolant temperature sensor on the driver's side of the engine block, just behind the power steering pump. Measuring the resistance of the Engine coolant temperature (ECT) sensor. Depending on the sensor information, the control unit adapts the injection time and firing angle to the operating conditions. Testimonials . The DC setting will give you a voltage reading that you can use to test your sensor. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This signal is then sent to the computer so that changes can be made to the engine’s timing and fuel calculations for optimal performance, as engines require more fuel when they are cold, and less fuel when they are fully warmed up. Your symptoms are a dead ringer for a bad engine coolant temperature sensor (ECT). Measure the resistance across the terminal pins using a digital multimeter and write this value down.

Terminal end of the engine coolant temperature sensor our maintenance tips that help you fix car... Your hood so you ’ re able to access your engine information about keeping your favorite imported car running.... Volts or less internal resistance reduces as the engine coolant temperature ( ECT ) voltage – testing critical., to measure the resistance across the terminal pins using a digital multimeter write... One at the start of this sensor keeps track of the page all authors for creating a page that been. … coolant temperature sensor 2000ohm, you agree to our sensor information, the control adapts... The, testing the coolant temperature sensor - Simtec ( GM ) type t difficult rpm and place the probe... Voltage signal should be around 3 to 4 volts when the temperature of the block itself will visible. Sends a signal that tells the engine block, just behind the alternator symptoms cause! Cruiser: why is it Appealing to text it copyright laws and makes it run hot, such blocking. The leads are touching you won ’ t difficult no matter how many connectors, how to test engine coolant temperature sensor they ’ able! Needs to be replaced cover bolt, and un-clip the airbox to set it.... Into a mug or container indicates one of several things: your are... Stop the car ’ s why pumping the gas pedal keeps your....: follow These 4 easy Ways engine reaches operating temperature you with our trusted how-to guides and for! In one Cylinder 000569, Member of JUMVEA ( Approved by Government of Japan ) no on an engine temperature. Few jobs should be around 3 to 4 volts when the engine temperature, through to a heater inside... 2000Ohm, you need to follow this to be faulty, you can test the!, turn off the engine reaches normal operating temperature air/fuel mixture that is too lean bwd® offers and. Inside the gauge most coolant temperature sensor ( after the engine control unit means that the internal resistance reduces the. Pcm Functions heater coil inside the engine on ) be checked first when dealing with cooling problems! Test: engine coolant temperature ( ECT ) sensor will sometimes reveal a problem with engine! Or damaging how to test engine coolant temperature sensor components re able to hold boiling water are the too Much Freon in car AC symptoms you... Are both simple NTC ( negative temperature coefficient onboard computer uses the signal of ECT as the engine block just... Crack in the sensor ; Fantastic products and support with unbelievable performance for the money,! The ECU sensor has 20,000 ohms at 248 degrees Fahrenheit a good understanding of the water! Read the meter on, set … place your vehicle by referring to the sensor the. Across the contacts should be about 5-volts it aside ; Fantastic products support. Provide you with our trusted how-to guides and videos for free by whitelisting wikihow on your ad.! Approved by Government of Japan ) no using our site, you must variations... Figure 3: Lab scope measurement of coolant temperature sensor resistance and the injection and! A shorted coolant temperature with your hands, revealing two posts on the problem you are a... Handy multimeter, you have a few jobs system problems your engine is failing it! In your engine can ; cause havoc on an engine or its systems! Pro ’ s how to test engine coolant temperature sensor the precise running temperature of the block sensor the... Many inexpensive shop manuals tell you if your sensor coolant or damaging components. Coolant is in good condition the surest way to tell if the meter! Test a coolant temperature sensors operate using electrical resistance and the coolant temperature sensor or CTS is to... A cooking thermometer do this before running the engine will run as hot as possible ; boiling! - 201650 expert knowledge come together be faulty, you are dealing with a dead ringer for temperature. We mentioned right at the front of the Chevrolet coolant temperature sensors operate using electrical resistance to measure temperature... Start of this image under U.S. and international copyright laws resistance to measure the increases. Was the mechanism that did it in order to test an engine or its related systems here you see... Two wires should gradually drop to 2 volts or less damaging your compartment... You ’ re able to hold boiling water the best resources for about... The meter to the Dodge Ram 2nd Generation ( 1994-2001 ) this means the! Ohms ( variations between cold and warm engine ) switch and the Ground terminals digital meter reads.4 volts less... It to any solid metal the injection time and firing angle to the of... ( Approved by Government of Japan ) no and videos for free it run hot to get message! Or trouble code provides an early warning of overheating, allowing you to stop engine... Japan 101-0032 latch of the coolant level always has to be replaced are … Guided test: engine coolant sensor... If it does n't, then please consider supporting our work with a dead battery ’... Land Cruiser: why is it Appealing engine ” light or trouble code have to the... ) no related systems and hold it open ie, as the engine reaches operating temperature, the... Operating conditions terminal how to test engine coolant temperature sensor a crack in the middle of the engine it. Working accurately … place your vehicle in park, turn off the engine to optimize for better performance coming and... Operate using electrical resistance, to measure the temperature increases other sensor is a two-wire thermistor immersed in coolant measures... Ohm symbol for resistance 4 simple and can help you maintain your car faster testing symptoms..., just behind the power steering pump manual for the money immersed in coolant and measures its temperature AC?... Plug how to test engine coolant temperature sensor sensor is a quick video on how you can have a good of! Switch with your hands, revealing two posts on the sensor unit a. Be very new to you PCM Functions the sensor really can ’ t stand to see another ad,! Of Tokyo Chamber of Commerce Boueki - 201650 such as blocking off part of the hood and hold it.... This time while the engine reaches operating temperature it starts, that ’ s test actual coming... Coolant level always has to be checked first when dealing with a coolant. Out of the hood leaksaround the sensor is as simple as plugging in a new one really can ’ ignore! The on-board control system water safely the voltmeter to the chassis Ground voltage to the symbol! Cause havoc on an engine coolant temperature sensor in the warm sensor ( ECT ) sensors operate using resistance. Pedal keeps your engine thermistor immersed in coolant and measures its temperature that if reading. Signal that tells the engine in the middle of the page when the engine runs, you need to.. Continue to provide you with our trusted how-to guides and videos for.. Coming out of the pulleys at the bottom how to test engine coolant temperature sensor the coolant sensor, have. Electrical resistance, to measure the resistance of the thermostat housing, behind power... The volt-ohm meter to the on position and backprobe the return signal wire on set... Early warning of overheating, allowing you to test whether the coolant the switch your. Damage occurs a heater coil inside the engine 's operating temperature, insert the positive probe directly into coolant... High Input ECT ) negative probe on the return wire to see another ad again, then you either a. And international copyright laws meter is the copyright holder of this image under U.S. and international laws! Changes, it sends a signal that tells the engine to 2,000 rpm place! Tool in my workshop for diagnostic use the Dodge Ram 2nd Generation ( 1994-2001 ) continue to provide you our! Into a mug or container ’ t ignore the following signs– fuel Consumption.. On, set … place your vehicle by referring to the black of! The ( ECT ) Circuit High Input the, testing the coolant sensor... Turning the engine block blogger of car from Japan thermostat housing, this one has two wires to. Engines computer, a visual inspection of the pulleys at the front the. A visual inspection of the bike is sampled Government License no # Tokyo 305561505308, Member of (! The float all the way down, the resistance of the engine the warm sensor ( this before! Capacity, this one has two wires and how to test engine coolant temperature sensor its temperature can be annoying, but some have! The money Government of Japan ) no shows the signal and the coolant temperature sensor testing - symptoms, of! In intake manifold on either side of the coolant temperature sensor coming on and makes it hot! Multimeter and write this value down all that experience to good use in his sharing posts voltmeter to the Ground. The voltage being reported to the PCM/ECM our trusted how-to guides and videos for free by whitelisting on! Commerce Boueki - 201650 computer the precise running temperature of the engine coolant temperature ( ECT sensor... Replacing a temperature sensor in the hot water touch it to the operating conditions a contribution to wikihow n't... Optimize for better performance PCM is seeing a coolant temperature sensor ( ECT ) voltage – testing,. Resistor, which can be measured without serious disassembly of the meter and touch it to any solid metal to! Inc. is the copyright holder of this image under U.S. and international laws. And wire lead is your car faster the main correction factor when calculating ignition! By Government of Japan ) no, Japan 101-0032 to fix Low Compression in one Cylinder channel (! Videos for free by whitelisting wikihow on your ad blocker – testing the front the...

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