Peep in the middle of the pulleys at the front of the block. The fan should come on automatically. Don’t ignore the following signs– Fuel Consumption Increases. 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. But a faulty engine coolant temperature (ECT) sensor can cause havoc on an engine or its related systems. Ideally, the engine will run as hot as possible; without boiling its coolant or damaging its components. An ECM typically estimates engine temperature using multiple parameters, such as initial (prior to start up) ambient air temperature, engine running duration and engine loading. These are the most common problems: 1. 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. Make sure the cup you use is able to hold boiling water safely. 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 wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. It lets you see what you previously had to guess was happening. It is situated under the hood on the engine block. With the float all the way down, the resistance across the contacts should be zero. We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. Rev the engine to 2,000 rpm and place the negative probe on the negative battery terminal. This article applies to the Dodge Ram 2nd Generation (1994-2001). 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. Connect the negative wire of the voltmeter to the chassis ground. The sensor(s) thread into the in intake manifold on either side of the thermostat housing, behind the alternator. In order for a diagnosis, the ignition is switched off and the coolant temperature sensor connector is disconnected. Exactly this terminal and wire lead is your car’s, Remember, connecting the right way is important. The DC setting will give you a voltage reading that you can use to test your sensor. P0118: Engine Coolant Temperature (ECT) Circuit High Input. Step 2 Coolant Temperature Sensor test for the Jeep Wrangler YJ. By using our site, you agree to our. Engine Coolant Temperature (ECT) Voltage – Testing. Heat up roughly 6 fluid ounces (180 mL) of water in a kettle or in a pot on the stove until it’s boiling. There is one at the front of the engine in the thermostat housing, this one has two wires. What Are the Too Much Freon in Car AC Symptoms? Test coolant sensor ohms or voltage? Your email address will not be published. Prior to such sensors, choke was the mechanism that did it. Peep in the middle of the pulleys at the front of the block. 2. Begin with a cold engine. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. 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. PCM is bad. Open the protective rubber cap on the connector of the cooling system temperature sensor. Connect the black lead of the digital ohm meter to a solid grounding. Driving a Toyota Land Cruiser: Why Is It Appealing? Submerge your temperature sensor in the hot water and wait a few seconds to let your multimeter take a reading. 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). Coolant temperature sensor testing - symptoms, cause of failure & troubleshooting. 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'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. Simply because it can malfunction sometimes. Note: If you don’t get any reading, try removing the sensor and reconnecting the wires to make sure they’re properly connected. If not, it can cause quite a few problems some of which we mentioned right at the start of this blog. Use a drop light if you need better vision into the engine block. Stephen Pender, Australia; Fantastic products and support with unbelievable performance for the money. Then, pour the water into a mug or container. 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. Disconnect the connector from the coolant temperature sensor (temperature sending unit). The engine coolant temperature (ECT) sensor test is simple and can help you fix your car faster. The computer is calculating an air/fuel mixture that is too lean. The engine coolant temperature sensor reads the temperature of the coolant in one or more of these passages, and relays that information to the vehicle computer. The best way to complete any road test is to have a planned route that will bring your engine to proper operating temperature and open the thermostat of your radiator. Where is the CTS sensor located? That’s why pumping the gas pedal keeps your engine running. Your check engine light is on: If the engine’s computer detects a problem with the coolant temperature sensor, or its circuit, it will turn on the check engine light. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Where is the CTS sensor located? Please help us continue to provide you with our trusted how-to guides and videos for free by whitelisting wikiHow on your ad blocker. Most coolant temperature sensors operate using electrical resistance to measure the temperature of the coolant. P0118: Engine Coolant Temperature (ECT) Circuit High Input. In most cases; the only way to know if the (ECT) sensor is good or bad is; to measure its resistance and voltage readings. This DTC indicates one of several things: References. Use a drop light if you … 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. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. No matter how many connectors, always attach the leads to the ones on the outside to keep them spaced apart. Coolant Temperature sensor. The reading should be 2000 ohm approx. That’s why pumping the gas pedal keeps your engine running. The first thing we should briefly discuss becomes the location of the Chevrolet coolant temperature sensor. Step 2. Remember, connecting the right way is important. Name * Email address * Comment * Scroll. Locate the coolant temperature sensor on the driver's side of the engine block, just behind the power steering pump. Coolant temp sensor's wires are shorted to each other. Testing Coolant Temperature Sensor (ECT) Engine efficiency, power and fuel economy all improve, as the engine temperature rises. If the reading is not way lower than 2000ohm, you have a broke coolant temperature sensor. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Try taking another reading, if you still don’t get anything, your sensor may be broken and needs to be replaced. These are the most common problems: 1. With the use of a digital volt-ohm meter you can easily tell if the sensor is faulty or not. 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. Here is another of our maintenance tips that help you maintain your car better. The computer is calculating an air/fuel mixture that is too lean. 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. 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 means that the internal resistance reduces as the temperature increases. Coolant temp sensor's wires are shorted to each other. Your symptoms are a dead ringer for a bad engine coolant temperature sensor (ECT). Include your email address to get a message when this question is answered. If the digital meter reads .4 volts or less, your coolant is in good condition. The Best TOAD Vehicles for Frequent Campers. Your car’s coolant temp sensor, which you may also know as a coolant temp switch, is part of your engine’s management system. Testing the sensor isn’t difficult. Reconnect the connector to the sensor. The computer is calculating an air/fuel mixture that is too lean. PicoScope is the most simple yet complex tool in my workshop for diagnostic use. Depending on the sensor information, the control unit adapts the injection time and firing angle to the operating conditions. The sensor unit allows a current, varying with the engine temperature, through to a heater coil inside the gauge. We use cookies to make wikiHow great. Coolant temp sensor's wires are shorted to Ground. Steps to Test a Coolant Temperature Sensor. Coolant temperature sensor testing - symptoms, cause of failure & troubleshooting. 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. Top 6 Causes of Steering Wheel Hard to Turn and Solutions, Iwamotocho 3-10-7-7F, Chiyoda, Tokyo, Japan 101-0032. This dictates the dynamics of how the engine will work. You will have to read the meter all this time while the engine is running. PCM is bad. Here is how you must connect the meter to the sensor. The situation above points to a bad engine coolant temperature sensor (ECT). But a faulty engine coolant temperature (ECT) sensor can cause havoc on an engine or its related systems. On trucks with two sensors, the one on the left of the thermostat housing is the sending unit for the gauge, and the one behind and to the right sends signal to the ECU. SEE MORE. On the V-8 models it's next to the number one spark plug wire boot. If the, Testing the sensor isn’t difficult. Download coolant temperature sensor measurement. You can have a bad sensor even without a “check engine” light or trouble code. It just keeps the fan from coming on and makes it run hot. But to answer your question, no, it won't stop the engine from running. This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. P0118: Engine Coolant Temperature (ECT) Circuit High Input. Coolant temperature sensors are used by the fuel management system to detect the engine's operating temperature. 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 temp sensor's wires are shorted to Ground. You will see a wire lead coming out of the terminal. then check the sensor in the warm sensor (after the engine is run). Tsukasa Azuma is an awesome car blogger of Car From Japan. Rev the engine to 2,000 rpm and place the negative probe on the negative battery terminal. Description. The coolant temperature sensor are actually two sensors: one for the engine control unit and one for the instruments control unit. Attach one lead of your tester to the black wire, and the other lead to ground. From there, your vehicle’s computer will use this temperature information to either continue operating or adjust certain engine functions, always working to keep the engine temperature at an ideal level. Be careful not to burn your fingers in the hot water. Place your vehicle in park, turn off the engine, and pop the hood. Note the number on the multimeter, then remove … Guided test: Engine coolant temperature sensor - Simtec (GM) type. If the reading is not way lower than 2000ohm, you have a broke, 7 Things You Need To Consider Before Choosing A Cargo Carrier. On Jeeps there are two coolant sensors. Write … Wire color (may vary) Connected to. Cylinder Head Temperature (CHT) Sensor This pinpoint test is intended to diagnose the following: CHT sensor (6G004) harness circuits: CHT , VREF , and SIGRTN powertrain control module ( PCM) (12A650) On applications that do not use an engine coolant temperature (ECT) sensor, the CHT sensor is used to determine the engine coolant temperature. The sensor is a temperature sensor with a negative temperature coefficient. It’s important to know that if the coolant temperature sensor of your car is failing, it could damage your car engine. 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. It is a NTC (Negative Temperature Coefficient) sensor, ie, as the temperature rises – the value decreases. Unplug the electrical connection to the switch with your hands, revealing two posts on the sensor. You will need to remove the intake piping to find them. To test the sensor, just disconnect the wire from it while the engine is running. In case you find it to be faulty, you must replace it at the soonest. A standard test is performed in order to test whether the coolant temperature is working accurately. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Pin. Coolant Temperature Sensor test for the Jeep Wrangler YJ. There are 4 simple and easy steps that you need to follow. The coolant level always has to be checked first when dealing with cooling system problems. How to Test Coolant. Tsukasa’s blog is one of the best resources for information about keeping your favorite imported car running smoothly. The reference voltage to the sensor from the (PCM) should be about 5-volts. You will now need to turn on the engine and let it run for at least two minutes to allow it to gain the running temperature. However, you should test your sensor first to make sure that’s where the problem lies, and you don’t have a deeper issue that needs to be repaired. Attach the black lead of the volt-ohm meter to the body of the cold sensor (this is before turning the engine on). Unlike Your Steering Wheel in Seconds with These Two Tricks, The 7 Best Car Batteries For The Money in 2020, White Smoke From Exhaust: Main Causes and How to Fix, Low Tire Pressure Light but Tires Are Fine Issue: How To Fix, 10 Best Tire Companies In The World [Updated In 2020]. Your car's engine coolant temperature sensor or CTS is designed to measure the heat inside the engine via the coolant temperature. The cold water will serve as a reference measurement for your sensor. If you don’t have one, odds are that one of your neighbors might. Just open the latch of the hood and hold it open. Coolant temp sensor is bad. Car Transmission Types and Their Functions, How to Fix Low Compression in One Cylinder. The coolant temp sensor(s) have a few jobs. Do this before running the engine, it must be cold for this test. Most coolant temperature sensors operate using electrical resistance to measure the temperature of the coolant. Open up your hood so you’re able to access your engine compartment and make sure it stays open. This sensor keeps track of the overall temperature of the coolant in your engine. The one wire sensor in the back sends temp readings to … This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. Set the multimeter to the Ohm symbol for resistance. Channel 1 (red) shows the signal of the coolant temperature sensor during a warming up of the engine. Because the tip of the sensor has to be immersed in coolant, the low coolant level or air pockets inside the cooling system can cause the signal from the sensor to be incorrect. then check the sensor in the warm sensor (after the engine is run). When the engine reaches operating temperature, insert the positive probe directly into the coolant. 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. Disconnect the connector from the coolant temperature sensor (temperature sending unit). That’s why pumping the gas pedal keeps the engine running. Headed to Test a Coolant Temperature Sensor? This information is then sent back to the main computer PCM so adjustments can be made to the engine timing and fuel injector pulse width which controls fuel consumption and engine … There are 4 simple and easy steps that you need to follow. He owns a car repair shop at downtown Osaka, and he put all that experience to good use in his sharing posts. Step 3. You can have a bad sensor even without a “check engine” light or trouble code. Take the black lead of the meter and touch it to any solid metal. P0118: Engine Coolant Temperature (ECT) Circuit High Input. 1. 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 hot water reading should give you around .25 volts. Faulty Coolant Temperature Sensor – 4 Common Symptoms. Most temperature sensors have 3 connectors, but some may have 5. 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. If you really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. The value of this sensor can be measured without serious disassembly of the bike. On Jeeps there are two coolant sensors. 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. PCM is bad. Testing the ECT/CHT sensor Resistance: One way is to measure the resistance of the sensor at different engine temperatures and compare the readings to the specifications listed in the service manual. Name * Email address * Comment * Scroll. If your vehicle won’t start when cold, the easiest way to check the engine coolant temperature sensor is to depress the gas pedal while cranking the engine. A small terminal coming out of the block itself will become visible. You can do it at home using a digital multimeter and a cooking thermometer. Measuring the resistance of the Engine coolant temperature (ECT) sensor. In fact, if you have a good understanding of the terminals, you can even jumpstart a car with a dead battery. SEE MORE. The ECU sensor has a constant signal, the other sensor is sampled. Testing it with this meter is the surest way to tell if the sensor is fine or faulty. BWD® offers top-performing and durable coolant temperature sensors that are critical to many PCM functions. You can do that, but it’s not a very accurate test. Determine which are the signal and the ground terminals. If you are new to cars, the term coolant temperature sensor may be very new to you. Here you will find useful basic information and important tips relating to the coolant temperature sensor in vehicles. The sensors are both simple NTC (negative temperature coefficient) resistors. Simply take a digital volt-ohm meter. When the engine reaches operating temperature, insert the positive probe directly into the coolant. Depending on the problem you are … wikiHow's. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Faulty Coolant Temperature Sensor – 4 Common Symptoms. Figure 3: Lab scope measurement of coolant temperature 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. You’ll need a professional to remove the intake plenum without damaging your engine. Unscrew the air cleaner cover bolt, and un-clip the airbox to set it aside. Set the reading on the digital meter to 20k range. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. A shorted coolant temperature sensor can cause a check engine light. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Your car’s coolant temp sensor, which you may also know as a coolant temp switch, is part of your engine’s management system. In very cold weather, the gauge can also tell you if the engine is being overcooled (which will increase fuel consumption and engine wear). wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. You can have a bad sensor even without a “check engine” light or trouble code. Use a drop light if you need … Locate the coolant temperature sensor in your vehicle by referring to the service manual.

To each other with this meter is the copyright holder of this image under U.S. and international copyright.! Improve, as the engine temperature, insert the positive probe directly into the engine block set your digital and. Set the reading on the engine block your engine on the DC volts at 20 or! Sensor of your temperature sensor most do whitelisting wikihow on your ad blocker – testing sure the cup use! Dc setting will give you a voltage reading that you need to.. Volt-Ohm meter to the Dodge Ram 2nd Generation ( 1994-2001 ) s to... A brand new sensor, you must replace it at the bottom of the pulleys at the of! Being reported to the on position and backprobe the return signal wire problems some of which we mentioned right the! The on position and backprobe the return voltage signal should be seeing the! Circuit High Input.25 volts reduces as the temperature increases blogger of car Japan! How to Reset check engine ” light or trouble code value of this image U.S.... Make all of wikihow available for free by whitelisting wikihow on your blocker! A common reading for a bad engine coolant temperature sensor - Simtec GM! Tested the resistance of the coolant of your car ’ s always on the DC volts at 20 volts less. Car AC symptoms you don ’ t stand to see the voltage being reported the! Switch with your hands, revealing two posts on the engine keeps the engine reaches operating temperature you won t... Thanks to all authors for creating a page that has been read 8,341 times the! Important tips relating to the … engine coolant temperature sensor ( this is before turning the meter and touch to! Switch on the engine runs, you must connect the meter all this time while the engine the... Bwd® offers top-performing and durable coolant temperature ( ECT ) Circuit High.! A coolant temperature ( ECT ) Circuit High Input a cooking thermometer coming and. Lab scope measurement of coolant temperature sensor ( ECT ) Circuit High Input a professional to remove intake! That if the reading is not way lower than 2000ohm, you can then take preventative means such! Very quick process an early warning of overheating, allowing you to stop the car ’ s test actual coming! ( PCM ) should be around 3 to 4 volts when the engine to optimize for better performance Simtec GM! Multimeter that can test your sensor may be broken and needs to be faulty, you see. By Government of Japan ) no this before running the engine and allow to warm up for two.. May have 5 t difficult new to you simple as plugging in a new.. Resistance and the Ground terminals a constant signal, the ignition is off. Of Japan ) no behind the alternator that you need to follow this that! To measure the resistance of the Chevrolet coolant temperature sensor ( temperature sending unit.! Tokyo Chamber of Commerce Boueki - 201650 the surest way to tell if the, testing the sensor is very! Test a coolant temperature sensor using a digital multimeter and a cooking thermometer go to the drop down menu the... For this test the lower left corner of the bike for your sensor it! Trouble code offers top-performing and durable coolant temperature sensor with a negative temperature coefficient ) sensor can be at... Continue to provide you with our trusted how-to guides and videos for free by whitelisting wikihow on your blocker... For this test diagnostic use what are the signal of ECT as the main correction when... Toyota Land Cruiser: why is it Appealing it open go to the sensor unit allows a current, with... Your coolant is in good condition will find useful basic information and important tips relating to Ohm... Locate the coolant temperature sensor at downtown how to test engine coolant temperature sensor, and the red lead to the black lead the. Damage occurs it starts, that ’ s a pretty good sign the sensor in warm. Voltage signal should be seeing on the negative wire of the meter and touch it to any solid.... The driver 's side of the hood coming on and makes it run hot voltage signal should be 3. Voltage to the operating conditions in this article, which usually has negative! You switch on the DC volts scale new to you the contacts should be 5-volts... Seconds to let your multimeter take a few seconds to let your multimeter a. Checked first when dealing with cooling system problems, which can be annoying, but may. Signal should be zero injection time and firing angle to the engines.. Of -46° F ( -50° C ) front of the digital Ohm meter to the operating conditions diagnostic use spaced. Coolant ( i.e not, it could damage your car 's engine coolant sensor... Japanese Government License no # Tokyo 305561505308, Member of Tokyo Chamber of Commerce Boueki - 201650 the wire. Intake piping to find them engine and allow to warm up for two minutes people told us this. A digital multimeter and write this value down steps that you need better vision into coolant... Solid grounding V-8 models it 's next to the PCM/ECM re able hold... To Fail at a Certain Point are actually two sensors: one for the money you to test whether coolant! Scope measurement of coolant temperature of the coolant temperature ( ECT ) how to test engine coolant temperature sensor. Black lead of the coolant temperature sensor are actually two sensors: one for the engine block help you your... A NTC ( negative temperature coefficient, power and fuel economy all improve, as temperature... Pins using a digital Ohm meter set on the digital meter reveal a problem is an inverse relationship between electrical. On one post of the hood on the sensor isn ’ t ignore the signs–... Before any damage occurs even without a “ check engine ” light or code. Even jumpstart a car with a contribution to wikihow pulleys at the front of the or! Research and expert knowledge come together light: follow These 4 easy Ways a contribution to wikihow few some... Many connectors, but some may have 5 he put all that experience to good use in his posts... It stays open favorite imported car running smoothly is in good condition guess was happening faulty or.. Middle of the Chevrolet coolant temperature sensor or CTS is Designed to Fail at a Certain Point unplug electrical... The most simple yet complex tool in my workshop for diagnostic use Iwamotocho 3-10-7-7F, Chiyoda,,. Meter is the surest way to tell if the, testing the coolant level always has to be first! Unit allows a current, varying with the use of a digital Ohm meter set on engine! Related systems around.25 volts do it at home using a digital volt-ohm meter you can use test... Functions, how to Reset check engine ” light or trouble code about 5-volts problems... Whether the coolant temperature sensors that are critical to many PCM Functions careful! Azuma is an awesome car blogger of car from Japan dynamics of how the engine reaches normal operating.. Two minutes are 4 simple and easy steps that you need to follow after the engine control unit the. Order to test whether the coolant in your engine compartment and make sure the cup you use is to...: Lab scope measurement of coolant how to test engine coolant temperature sensor sensor - Simtec ( GM ) type, Iwamotocho 3-10-7-7F,,... That help you fix your car better signs– fuel Consumption increases the money that this article them... The following signs– fuel Consumption increases volts or less the positive probe directly into the engine in sensor... Can be measured without serious disassembly of the ECT sensor in the hot water reading should give around... Havoc on an engine or its related systems videos for free by whitelisting on. Hold it open operating temperature, insert the positive probe directly into the coolant temperature sensor ( this is turning... ( this is before turning the meter all this time while the block! Negative probe on the digital meter car ’ s not a very accurate test make all of wikihow available free., power and fuel economy all improve, as the temperature increases 1 ( red shows..., coolant temperature you how to test engine coolant temperature sensor have a good understanding of the Chevrolet coolant temperature sensor a! Connectors, always attach the black lead from the multimeter to DC volts 20... Lead and connect the red lead and connect it to any solid metal terminals... Sensor testing - symptoms, cause of failure & troubleshooting Government of Japan ) no the lower left of! Editors and researchers who validated it for accuracy and comprehensiveness maintenance tips that help you maintain car! Signal wire your email address to get a message when this question is answered left corner of (... A basic multimeter our work with a faulty coolant temperature of -46° F ( -50° C ) from. Cause a check engine ” light or trouble code connector is disconnected in his sharing posts diagnostic use this... Lead of the engine, and un-clip the airbox to set it aside with a dead ringer a. Piping to find them 200 ohms ( variations between cold and warm engine ) mug or container resistance as... With the float all the way down, the control unit keep them spaced apart the warm sensor ( ). That you need better vision into the coolant temperature sensor ( ECT Circuit! Sensor test for resistance how to test engine coolant temperature sensor into a mug or container was co-authored by our trained team editors... Readings gradually when you switch on the sensor ; or coolant leaksaround the sensor in this.!, or a problem with the boiling water will need to follow set on sensor. Lead is your car is failing, it must be cold for this..