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how to test ecm motor with multimeter

Check the diagram above and connect Circuit Tester C and D accordingly. Nowadays, the digital multimeter is way more popular because of its efficiency and accurateness. If the motor is operating at 240VAC with the jumper in place, the motor will be permanently damaged. Note: While testing wires, always choose a location that is exposed and close to the motor. Onboard Diagnostic (OBD) is an engine code scanner that can access vehicle data. How to Easily Test an ECM Motor Using the SUPCO TradeFox - YouTube and our Programming and updates installed are also responsible for optimizing the engines performance. Troubleshooting ECM HVAC Blower Motor #handyman #hvac - YouTube ECM Motor Testing. Now check the voltage of the multimeter. Save my name, email, and website in this browser for the next time I comment. *******************************************************************GET IN ON THE SUPCO TRADEFOX CONVERSATION:Instagram: @supco_hvacFacebook: http://bit.ly/SUPCOfbLinkedIN: http://bit.ly/SUPCOlinkedin How To Test Your ECM Computer - Flagship One Blog How to Test an ECU with a Multimeter: The Definitive Guide I reset and test my ECM after every new major install and so should you. After opening up the ECU board, If you see any broken components or corrosion, the ECU computer will need to be replaced. And if you dont know much about ECM computer or have no experience, you should first need to learn the ECM testing procedure from a professional or an experienced person. Connect pins 1 and 3 to the common side of the 24 volt transformer (fig. Using alligator clip accessories on the test leads is often best for securing test leads in place. Easy Ways to Test a Vehicle Speed Sensor with a Multimeter - wikiHow The engine control unit (ECM) controls some of the main parts of your cars operating system: Fuel injection, idle speed, and ignition timing. . PLxnHR5_D2ojyDrxCT9MIttGW4wxOZ3nRefrigerants, Fuel Gases, Electricity, and other hazards are present when working on HVACR systems. How To Test The GM Ignition Control Module (1995-2005) Thank you. The consent submitted will only be used for data processing originating from this website. You should apply the required settings for the multimeter before connecting it with the motor. So you can rely on my recommendation. It does this by analyzing the data it receives from individual sensors and transmitting that data to a variety of actuators that will adjust the way they perform based on the communicated information. This is mainly due to the fact that your engine computer is responsible for so many different areas within the engine compartment, many of which become affected when the engine computer begins malfunctioning. How to Test DC motors? | All About Circuits So, if you have proper knowledge about testing an ECM, program software, and tools, you can test your ECM at home without any difficulty. Here are the four steps on how you can test ECU with a multimeter: Step 1: Setup MultimeterStep 2: Visual InspectionStep 3: Start Testing With A MultimeterStep 4: Record The Readingif(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'caralso_com-large-leaderboard-2','ezslot_5',149,'0','0'])};__ez_fad_position('div-gpt-ad-caralso_com-large-leaderboard-2-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'caralso_com-large-leaderboard-2','ezslot_6',149,'0','1'])};__ez_fad_position('div-gpt-ad-caralso_com-large-leaderboard-2-0_1');.large-leaderboard-2-multi-149{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:7px!important;margin-left:auto!important;margin-right:auto!important;margin-top:7px!important;max-width:100%!important;min-height:250px;padding:0;text-align:center!important}. endobj Reconnecting a connector the wrong way could damage the motor. For me, studying and getting knowledge about automobile its really fun and entertaining. Take a look at some of our related articles below. Performing a visual inspection is something that anyone can do right from home and is one of the first tests you should perform if a faulty ECM is suspected as ECM plays a very serious role in your vehicle. Make sure the circuit is connected with a harness when you test the engine control module because if the harness is disconnected, you wont get any results. Step 2: Then, turn the shaft clockwise and counterclockwise. Continue with Recommended Cookies. In this HVACR Video, we go over the Troubleshooting of the ECM 3.0 Variable Speed Blower Motor and Testing with and without the TecMate Pro. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. A compatible ECU will always help you to diagnose an ECU properly. Remove the filter and check that all of the dampers, registers, and grills are open and free-flowing. B219400 THE POWER SUPPLY OF CIRCUIT 30 IS <7.5 V Connector pin outs. Tech Tip 1: Don't automatically assume the ECM motor has failed. They use high-speed, digital signal processing to filter out electrical noise and capture inrush current as the circuit protector sees it. Now set the multimeters to resistance mode. If there are any breaks on the checked circuit, the multimeters will start beeping. Locate pins 12 and 15. To address these two concerns efficiency and noise the electronically commutated motor (ECM) was developed. ECM Motor Testing | Baker Distributing | Baker Distributing First we want to ensure the battery is providing the correct amount of voltage and trace that voltage all the way from the battery, through the sensors, to the engine computer. There is a short circuit to positive or an open circuit Then, connect the red probe of Circuit Tester F to the white wire. Use a multimeter to check the electrical resistance of the motor. I thought testing and replacing the ECM computer was a hard work and demanded a professional mechanic (and wasted a lot of money, of course). Joined Jun 7, 2009. I am a Car Mechanic and a student of Automobile Restoration here in Florida, USA. On 240VAC systems, the jumper should be removed. I have other variable speed motor diagnosis videos on determining if the actual motor is bad or the module on the side of the motor is bad. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. If this is the only symptom identified, there is no need to replace the motor. There is a short circuit to positive e or an open circuit. I will help you to get solutions for your car through this website. But if you want to test your car ECU computer, you have to have some specialized knowledge and experience of testing an ECM computer. Multimeters make simple everyday testing so easy.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'caralso_com-box-4','ezslot_3',147,'0','0'])};__ez_fad_position('div-gpt-ad-caralso_com-box-4-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'caralso_com-box-4','ezslot_4',147,'0','1'])};__ez_fad_position('div-gpt-ad-caralso_com-box-4-0_1');.box-4-multi-147{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:7px!important;margin-left:auto!important;margin-right:auto!important;margin-top:7px!important;max-width:100%!important;min-height:250px;padding:0;text-align:center!important}. Condenser Fan Motors ; Contactors and Relays ; Cuber . There are other codes that I could go on with but hopefully, the ones provided are enough to determine if it's computer-related or not it appears that the issue only happens when it's extremely hot 100+ degrees outside and has not happened to me at night and did not happen once during colder temperatures and winter. To do that, you have to connect Cs red probe to the black wire and Ds red probe to the red wire. You will be redirected once the validation is complete. Repairing an ECM depends on the issues with your ECM. From the GE ECM Service Guide, https://www.linkedin.com/company/contracting-business-mag/, AHR 2023: The Importance of Training and Certification. See you next time at ACSERVICETECH Channel!Check out All of the ACSERVICETECH Playlists- https://www.youtube.com/channel/UCOZR-1IqsAer9wzlvFgb4mA/playlists?view_as=publicACSERVICETECH is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.You can enter Amazon through this http://amzn.to/2aenwTqHere is the Link for the TecMate Pro- http://amzn.to/2jIP0tyHere is the Link for the newer UEI DL469 Multimeter- http://amzn.to/2jw4ePJHere is a link for the Supco Magnet Jumpers http://amzn.to/2gS4h6zHere is the Link for the newer UEI DL479 Multimeter with temp sensor- http://amzn.to/2jtsUbJHere is the link to the 2 pairs of alligator clips- http://amzn.to/2CtIL5zHere is a link to the JB 6 CFM Vacuum Pump http://amzn.to/2nqbvo8Here is the Link to the Appion Blue 3/8\" to 1/4\" Vacuum Hose- http://amzn.to/2uYlVycHere is the Link to the Appion Red 3/8\" to 1/4\" Vacuum Hose- http://amzn.to/2uYg6RoHere is the link to the Appion Valve Core Removal Tool- http://amzn.to/2uYr8WLHere is the link to the Yellow Jacket 1/4\" by 1/4\" heavy duty hose straight- http://amzn.to/2umtcodHere is the link to the CPS Vacuum Micron Gauge- http://amzn.to/2v1nM3OHere is the link to the Supco Vacuum Micron Gauge- http://amzn.to/2v1JRiAHere is a link for RectorSeal Bubble Gas Leak Detector http://amzn.to/2ckWACnHere is a link to the UEI DL389 Multimeter used in the videos- http://amzn.to/2xAdaJfHere is the link to the Fieldpiece ST4 Dual Temp Meter- http://amzn.to/2wc1ME3Here is a link to the Air Acetylene Torch setup- http://amzn.to/2aQalsb Here is a link to the 15% Silver Brazing Rods- http://amzn.to/2gVLyLcHere is a link the Nitrogen Regulator http://amzn.to/2bXdR5fHere is a link to the Nitrogen Flow Meter http://amzn.to/2brvoBgHere is a link to the Digital Refrigerant Scale used in the videohttp://amzn.to/2b9oXYl Here is the Link for the Yellow Jacket Refrigerant Manifold Gauge Set used in the videos http://amzn.to/2aenwTqHere is a link to Refrigerant hoses with valves used in the videos http://amzn.to/2aBumVIHere is the link for the Imperial Kwik Charge 535-C- http://amzn.to/2uipEI6 Here is the link to the Fieldpiece SDMN6 Dual Pressure Testing Manometer with Pump-http://amzn.to/2jyK5KaHere is a link for the Supco Magnet Jumpers http://amzn.to/2gS4h6zHere is a link to 1 gallon of JB Vacuum Pump Oil http://amzn.to/2mGrlXyHere is a link to the General Tools digital Psychrometer http://amzn.to/2cSHsi1Here is a link to the Fieldpiece SDP2 Digital Psychrometer- http://amzn.to/2nniMVRHere is the link for the Ratcheting Service Wrench http://amzn.to/2dGV4NhHere is a link to the Appion G5 Twin Recovery Pump http://amzn.to/2dGSEyr Here is a link to the Malco Sheet metal scribe- http://amzn.to/2qCwu9DHere is a link to the Malco 90 Degree Right Hand Vertical Snips- http://amzn.to/2qHHpu4Here is a link to the Malco 90 Degree Left Hand Vertical Snips- http://amzn.to/2qHF564Here is the link for the Malco 3\" Blade Combination Snips- http://amzn.to/2dz7EjcHere is the link for the Irwin Wire Stripper/Cutter/Crimper http://amzn.to/2dGTj2VThank You, ACSERVICETECH At this point the meter should be displaying a fairly constant AC voltage. In this case, you might have to replace the motor. If you use a 100 VAC motor, you will get 100V reading on the multimeter. After you open up the car computer board, now you need to look for any broken components or corrosion in the ECU board. Please enable cookies on your browser and try again. If this is the case, rev the motor up and down and observe the reading on . 3 0 obj If your car engine computer needs to be repaired instead of replaced then that will also add to the amount of labor required. You should receive a reading of zero or nearly zero. The price range of a multimeter is from $25 to $450. Here are simple steps to follow when using your multimeter to test your ECU: Set Up Your Multimeter. So, its essential to have a multimeter in your car. After testing the fuse and relay, you will need to perform the amperage draw. Its important to remember that this test will only work on vehicles with computers that dont require programming which would rule out all newer model vehicles. When executing a continuity test, theres no need for power. There are various ways you can test the engine control unit with a volt-ohm meter.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'caralso_com-large-mobile-banner-1','ezslot_12',153,'0','0'])};__ez_fad_position('div-gpt-ad-caralso_com-large-mobile-banner-1-0'); There are cautions for you when you test your engine control unit with a multimeter, and you should know them properly, whether you test or replace your car ECU. Hello, I'm Sam. It should be between 12 and 16 volts. The current reading on the multimeter should not be more than 1.2 amps because if the amps are more than that, that tells you there is anything wrong with the car computer. If available be sure to ask for a history of the car, such as known check engine light issues, idle speed issues or any issues that the previous vehicle had including past scheduled maintenance . If it's higher than the manufacturer's recommendations, then correct the airflow restriction.If the motor does not shut off at the end of the cycle, check the delay times and wait for delays to time out. 1 0 obj Repair costs and labor at a dealership could be anywhere from $1,000 to $2,000 depending on the vehicle. U015500 Communication with the instrument cluster has a malfunction All Product Lines HVAC Residential HVAC Commercial HVAC . Then test the motor terminals and wires. Apart from the method above, there are two other different methods by which we can test an electric motor. If you are still confused, study the diagram shown above. But, you should keep in mind that Labor costs and a new ECM purchase cost can also depend on your state. A faulty engine control unit can bring various issues to your car, such as sudden shut-off, car wont start, and poor engine performance. Technician-Proven:Our technician focused line of innovative tools are one-of-a-kind,\r resourceful solutions that make life in the HVACR field easier.\r Our unique tools have been designed by real trade technicians whove\r used their ingenuity and resourcefulness to solve common on-the-job\r problems. But, before you replace the ECU or ECM, you should know the proper procedure to replace the ECM computer in your car.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'caralso_com-narrow-sky-1','ezslot_20',129,'0','0'])};__ez_fad_position('div-gpt-ad-caralso_com-narrow-sky-1-0'); If you unplug or disconnect the ECU, the vehicle wont run because an ECM is the brain of a vehicle. If they can't, lubricate them. endobj Make sure the power to the component; otherwise, you wont find circuit reading. So, lets get started. If fault codes are present, consult the manufacturer's recommendations to resolve the problem. Tech Tip 2: When it's necessary to disconnect the power from the HVAC system, it's always a good practice to verify that voltage has been disconnected, by using a voltmeter. If the system is operating normally in each stage, then there is no problem. The service requires full cookie support in order to view this website. The motor should run. Confirm there are no limits, rollouts, or safeties tripped. Tech Tip 6: Always pull the connector and not the wires. The aim is to check the windings for open or shorts circuit. (1). The electrical motors that were used in HVAC applications were AC induction style motors that were either single-or multi-speed they'd run at one speed for heating, another for cooling, and sometimes a third speed for two-stage systems. Then connect the black probe to the white wire. When checking low-voltage connections, always use the C terminal on the board, never on the ground. C427 Implausible Data was received from the electronic ignition switch, ESP Electronic Stability Program If you are thinking about how to test ECM computer, you come to the right place because today I will show you how to test ECM computer by yourself. Afterward, we can check the motors condition according to the two values. An example of data being processed may be a unique identifier stored in a cookie. This is the simplest of the tests. In order to find a suitable replacement, you need to locate the part number on your original unit and find a replacement with a part number that matches. Also check for any fault codes present on the control boards. Diesel vehicles like Ford F250s and Dodge 2500s are among these vehicles that have expensive engine computers. First, you have to test the fuse and relay with your multimeter. This has happened while driving but usually happens when the key is removed from the ignition. You can now start the engine and let it idle. By following these ways, you can test ECM computer. Privacy Policy. How do I test to confirm I have a good tach signal - Digital Guard Dawg With over a decade in the business, we are the most reliable source when it comes to programming services for replacement engine control modules. 2280 The power supply at the input of the control unit combustion engine has a malfunction, ESM Electronic Selector Module At this point a smell test should be performed, if the plug emits a distinct odor like burnt electronics then there is a good chance the internal circuit board is fried. All rights reserved. ECM control modules are factory programmed for specific manufacturer applications. Set your multi-meter to the Rx1 setting. Save my name, email, and website in this browser for the next time I comment. The process for testing an engine computer is not always as straight-forward as testing other modules within your vehicle and oftentimes may be difficult and time-consuming. When you see the car computer gets the proper voltage from the battery. How to Test an ECU With a Multimeter? - ElectronicsHacks In input process elimination, The battery has a major role. (The one-min interval is an industry practice that allows everyone to take the reading at the same time. Look on the outside of the motor for other potential problems, like holes or smoke points. Thats why you should take the time to test the ECM computer by process of elimination. Any type of faulty wires or connectors can be the reason for a bad motor. If you are testing the ECM computer and found the main culprit, then its better to go to an auto repair shop or a professional to take proper steps about your car computer. X]@u;v\(}%VH?!}v}P'!pK\R+=Z;+&(xe d. Setting up your meter for a parasitic draw test. Move the switch from side to side and, with a trigger switch taped so it remains on, press on the brushes and turn the commutator by hand. Start the vehicle and wait for it to idle down to normal idle speed. 1. You might have to test for these kinds of issues too. Figure 5. So you can rely on my recommendation. Touch the two test leads to the two electrical connections. If you read 12.6 volts with the car engine off and 13.7 volts with the engine on, this looks good, and your battery is fully charged. However, if you still have some doubts, feel free to go through the article one more time. B219500 "THE POWER SUPPLY OF CIRCUIT 30 IS < 8.5 V This is mainly due to the fact that your engine computer is responsible for so many different areas within the engine compartment, many of which become affected when the engine computer begins malfunctioning. " 3XZV\BU](x_li9C\IcM>4)hq%|\66d@[cc{95W j4/4Ih 7lmuakk$5:'oz3Fl_{@'ri@X0plsl1|F4'9k;YlJn7B]KOl3iK"c>c"(t=wU6qb>k\)\a2W GKG+~I$}5m:\gM+^b)v}D~24`}-EJR,zEj+oH=Hz/,JW! Using a multimeter set on the Ohm scale, use the positive lead and test the black wire. The reference voltage is used for sensors and switches. (2). Car Owners needs to ensure that a thorough diagnosis was made before deciding to replace your engine computer and this is because there are instances where it is not necessary to replace or repair your unit. If your motor does not pass these tests, that means there is something wrong with your motor. The multimeter is also known as a volt-ohm meter. How to Replace a PCM ECM ECU Module (Engine Computer) on 2005-2006 Ford Escape / Mercury Mariner / Mazda Tribute, Car Engine Computers No Longer the Brains, How to Replace a PCM ECM ECU (Engine Computer) on a 2001 Dodge RAM Truck Pick-up, How to Buy the Right Replacement Module for Your Chrysler PCM, The P0138 Trouble Code and How To Deal With It, 1999 Ford Truck (F-Series) 7.3L F81F-12A650-BF PCM ECM ECU Control Module (Engine Computer) Replacement, How to Choose the Best PCM for Your Ford Vehicle, 5 common Problems With Cars and How to Check Them, 2004 Jeep Liberty Problems To Keep In Mind. Bad ECMs may also display similar symptoms as other faulty components making it difficult to determine where the symptoms originate. You can also check to see if the unit is burnt by opening the unit and inspecting the circuit board to see if there are any fried components. A swap is only effective for older cars. B162A15 The Left low Beam has had a malfunction. Tech Tip 4: If you must replace the 2.0, 2.3, or 2.5 control module, then be sure to use a direct replacement from the manufacturer. In addition to this, certain vehicles contain engine control modules that are very hard to find due to limited production which will also increase the price if a replacement is required. WTWH Media LLC and its licensors. Testing ECM computers would be really easy if you use OBD II for testing. Whether you are getting a trouble code, your fuel economy is declining, your vehicle stall or misfire , a check engine light or non existent engine performance you should always think the ECM could be the culprit and you do not really need an auto repair shop to do the basic steps. ), 3 Ways To Recondition A Car Battery That Wont Hold Charge. Now connect the red probe of Circuit Tester E to the red wire. If you need any help let me know. Crank the engine for several . With an Onboard Diagnostic (OBD) scanner, testing a car computer is so easy. However, if the system is excessively noisy, doesn't appear to change speeds in response to a demand for heat or cooling, or is having symptoms during the cycle such as a tripping limit or freezing coil, there are a number of checks that can be performed. First, make sure you unplug the electrical connection connected to it. 4 0 obj After testing your ECM computer, you should come up with a certain result of your ECU.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'caralso_com-mobile-leaderboard-1','ezslot_17',130,'0','0'])};__ez_fad_position('div-gpt-ad-caralso_com-mobile-leaderboard-1-0'); ECM computer testing is necessary for your car. First, remove the additional components such as capacitors and extension cables from the motors circuit. The second thing to do is start the smell test on your car computer; if your ECU computer smells more like burnt plastic, that means something is wrong, or its not alright. Its almost always cheaper to go to your local junkyard or used parts store rather than purchase the part directly from the dealership. However, for this process, you need some DIY skills. document.getElementById("ak_js_1").setAttribute("value",(new Date()).getTime()); What Is An Engine Control Unit And How Does It Work, Multimeters make simple everyday testing so easy, How To Properly Ground A Car Battery | Ground Automobile Electrical system, How To Jump Start A Dead Battery Without Another Car (Fast), Causes Manual and Automatic Transmission Will Not Engage in Any Gear, 8 Things That Can Drain A Car Battery When The Car Is Off, Car Battery Dead Will It Recharge By Itself? The reference voltage was not available in the past, but now its a very essential and familiar use in the car. These are the components that will need to be checked to test a car computer. <>>> B126231 "A Magnetic interference field was detected" There has to be a better way. x[KOI#X=|J9#vfm@BckFdPQ=/Ywg?4_NFuJ)m <> First off is testing the 2 wire speed sensor. When you get a reading that is equal to 1.7 times the power supply, that means the motor is working properly. For Step 2, a simple swap can be done. What's a Realistic Conversion Rate for Service Agreement Sales? % Start your car and allow it to run for a few minutes. If you follow these steps correctly, you can identify the condition of any motor. You can check your continuity with an ohm meter. I hope you enjoy and find them very beneficial! Here are five useful ways to test ECM computer: OBD or OBD II code scanner Visual Inspection Car Battery Check A Swap Process of Elimination 1. And you can test the car computer at home.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[728,90],'caralso_com-medrectangle-3','ezslot_5',145,'0','0'])};__ez_fad_position('div-gpt-ad-caralso_com-medrectangle-3-0'); When an auto repair shop costs you high for engine control module testing, learning how to test your car computer will save you money and time. Don't try this at home.Supervision is needed by a licensed HVAC Tech while doing this as Experience and Apprenticeship garners Wisdom and Safety.If you want to support the ACSERVICETECH Channel and receive more HVAC content, check out www.Patreon.com/acservicetechWe've Partnered with TruTechTools.com! Usually, the car will regain power in around 45 minutes to an hour but has taken up to 3-4 hours before and seems dependent on the temperature before the power is restored and the car will start. Put the multimeters positive lead to the battery ground post, and then you need to touch the multimeters positive lead fleetingly to the proper terminal of the modules harness connector. Using a scanner, you can find out your car engine code, which will show you ECM computer testing results. Link the red probe to the red wire. For this motor test, we are going to use two multimeters; Circuit Tester A and Circuit Tester B. You can test your car ECM using an OBD-II scanner and a multimeter (Volt Ohm Meter). If so, the following guide is for you. Whatever the reason, youve got yourself a faulty motor. Should You Repair or Replace that HVAC Unit? Once a diagnosis has been made and you have concluded the ECM is malfunctioning, your next step is to decide how to move forward; to decide whether your ECU ( Electronic Control unit needs to be repaired or replaced altogether. Continue with Recommended Cookies, Thinking of testing an ECU with multimeter? Using thin leads will prevent the terminals from being damaged by a voltage check. Use a multimeter or an ohmmeter to test the voltage of the electric motor. When you test your car ECM computer or car computer, you also need to understand the engine computer failure indication. Dec 5, 2009. This motor may take a while to come to a complete stop with selected delays and the normal ramp down. Since there is almost always a factor that contributes to ECM failure, addressing the underlying cause is a priority. Check all terminal/plug connections both at the HVAC system control board, and at the motor. For every version of ECM computer resetting and testing processes are the same. Step 1: First, remove the gear head and the motor. ECM Blower Motor Quick Test Fig. For most models of ECM motors, it is normal for the motor to rock back and forth on start up. If delays are too long, then reset them using the manufacturer's chart. You can also test your car ECU at home and by yourself using on-board diagnostics 2 readers or a scanner. This also helps you avoid any difficult issues around the engine control unit computer. Analyzing an error code is not always an exact science but is an important starting point when diagnosing your vehicle as it can help you diagnose the right issue for example identifying that the issue was the control modules and not the electrical system . Before going to the junkyard you only need to find out the exact product details such as the part number that is on your original unit and match it up with the replacement module. For brushes/commutator, your best check is visual. GE offers a few basic checks that technicians should perform before troubleshooting the ECM motor.

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how to test ecm motor with multimeter