how to test ecm motor with multimeter

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). The motor should run. 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. 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. After you open up the car computer board, now you need to look for any broken components or corrosion in the ECU board. Also, since the motors run on high speed all the time, the noise levels are also high. Because there is an intricate wiring system connected to your ECM and because the ECM is equipped with sophisticated software, testing can become very involved. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. Start the vehicle and wait for it to idle down to normal idle speed. ECM 2.3 has a 16-pin control wiring harness running from the board to the motor. These are the components that will need to be checked to test a car computer. 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. The aim is to check the windings for open or shorts circuit. Start by setting the meter to the best available range. Module cost from these online stores are as little as $100.00 and even the rarest modules like cummins diesel control modules are sold at a fraction of the price when compared to the dealership. 07 grandprix has multiple codes that every time its cleared difference codes return but some are the same just would like to get the ecm tested and repaired if possible. And you will also get a PDF, where you will see the diagnosing process of a bad ECU with a multimeter.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[320,50],'caralso_com-medrectangle-3','ezslot_10',145,'0','0'])};__ez_fad_position('div-gpt-ad-caralso_com-medrectangle-3-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[320,50],'caralso_com-medrectangle-3','ezslot_11',145,'0','1'])};__ez_fad_position('div-gpt-ad-caralso_com-medrectangle-3-0_1');.medrectangle-3-multi-145{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:50px;padding:0;text-align:center!important}. A good and properly charged battery should read at least 12.6 volts with the engine off, or 13.7 volts with the engine running. All rights reserved. Regular ECM tests will help your car to run properly on the road. Any type of faulty wires or connectors can be the reason for a bad motor. Once installed, drive your vehicle for a complete drive cycle to ensure the issues you were experiencing with your original unit do not return. Some tools and indications will help you to diagnose ECM computer.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'caralso_com-medrectangle-4','ezslot_4',103,'0','0'])};__ez_fad_position('div-gpt-ad-caralso_com-medrectangle-4-0'); Scanner and visual inspection is the most common method to test ECM computer. Turn on the multimeter and set it to read voltage. You can also buy an ECM motor tester on Amazon to test the module (plug the applicable plug into the low voltage section of the module and clip the leads to 24v somewhere, then turn the tester on. Tech Tip 5: If a check of the control module indicates replacement is required, then also check the motor module. Should You Repair or Replace that HVAC Unit? If this is the only symptom identified, there is no need to replace the motor. *******************************************************************GET IN ON THE SUPCO TRADEFOX CONVERSATION:Instagram: @supco_hvacFacebook: http://bit.ly/SUPCOfbLinkedIN: http://bit.ly/SUPCOlinkedin The best way for a deduction to be made is by making sure that all the sensors and actuators are functioning properly; we need to ensure that the sensors are supplying the correct amount of power to the ECM and that all components are able to receive the correct signals that the computer provides. Particularly, OBD-I where Engine Computer does not require Programming. When you know how to test the ECU, you will be able to know what causes your ECU to go bad and you also be able to know common symptoms of a bad ECU. You will be redirected once the validation is complete. An example of data being processed may be a unique identifier stored in a cookie. First thing you need to do when you are testing an ECU with a multimeter that properly set up the multimeter. Getting your ECM replaced or repaired at a mechanic or dealership is one of the more costly expenses and there are a few factors that determine that price; rarity of part, age of vehicle, and labor are among these main contributors. M0qV5~:>+R^+[P_t|2MqA5_xv43Q'_T&t(BnPa~=>h?>] This is typically shown as a "Hz" value on your multimeters turn dial. Remember that ECM motors have high voltage going to them at all times and are turned on and off by low voltage commands), the testers are listed below: Onboard Diagnostic (OBD) is an engine code scanner that can access vehicle data. Whenever your vehicles check engine light comes on there will be fault codes attached to it that will indicate to the driver what the possible issue might be. ECM 3.0 is a communicating motor that consists of four (4) control wires connecting the board to the motor. 2 0 obj An engine control unit (ECU) monitors most of the sensors in the engine bay to bring out the highest performance of your vehicles engine. Now check the voltage of the multimeter. While other components may normally display clear-cut symptoms when faulty, symptoms within your engine computer may not be as obvious. In any auto shop or many retail shops, you will get a multimeter easily. Also, check and clean the blower wheel, secondary heat exchanger, and evaporator coil. Tech Tip 7: When checking any plug connector, the meter leads are most likely larger than the terminals or socket. C427 Implausible Data was received from the electronic ignition switch, ESP Electronic Stability Program A faulty motor can cause a lot of trouble. A swap is only effective for older cars. Tech Tip 6: Always pull the connector and not the wires. If you need any help let me know. B162A15 The Left low Beam has had a malfunction. Verify that the correct thermostat input voltage is present at the interface of the main control board on the furnace or air handler. 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. 4 0 obj Mechanical problems such as faulty ball bearing can trouble the operation of your motor. For this motor to operate, make . if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'caralso_com-leader-3','ezslot_14',115,'0','0'])};__ez_fad_position('div-gpt-ad-caralso_com-leader-3-0');After you test all of these output units, you see output units are not getting the proper signal, which means your car computer is bad or not working correctly. In most cases, the units are sent completely plug and play so that your vehicle will even start upon installation. Try and find it on the internet or ask the manufacturer. " 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! ECM control modules are factory programmed for specific manufacturer applications. #11. you would test your insulation with a megger. (Really? If removing the filter corrects the problem, clean or replace with a less restrictive filter. This is the simplest of the tests. Thats why first you need to check the battery voltage to the engine computer, as it provides a sufficient amount of voltage through the ignition switch, through the sensors, and the fusses because the battery produces voltage to the Engine computer through these input units. Using a multimeter set on the Ohm scale, use the positive lead and test the black wire. After the required connections are made, you apply the test voltage for a period of one min. Repairing an ECM depends on the issues with your ECM. There is a short circuit to positive e or an open circuit. Firing orders. 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. Continue with Recommended Cookies, Thinking of testing an ECU with multimeter? If the system is operating normally in each stage, then there is no problem. The price of a multimeter depends on quality and precision. In General, to test the motor, first, you need to set the multimeter to resistance mode. With this method, we are going to check whether the motor circuit is closed or open with a simple continuity test. I think that I can handle this problem well on my own in the future. So, when you notice these issues in your car, you should test the ECM properly and quickly. If you use the wrong control module, it will void all product warranties and may result in improper or no blower operation. 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. Certifications: B.E.E. So, bring your multimeter and set-up for the circuit and ensure you use the circuit with the best range available multimeter gadgets. The multimeter is also known as a volt-ohm meter. Using a scanner, you can find out your car engine code, which will show you ECM computer testing results. When you see the car computer gets the proper voltage from the battery. 1 0 obj In the ohmmeter mode, connect the meter to the plug and monitor the resistance as you wiggle the cord where it enters the enclosure. When an Onboard Diagnostic (OBD or OBD II) scanner shows you codes, you need to understand those codes to fix issues in your car. There are two types of multimeter: analog multimeter and digital multimeter. First off is testing the 2 wire speed sensor. While sending your ECM to a professional is the only sure-fire way to receive a guaranteed diagnosis, there are steps you can take in order to ensure you are making an informed and sensible decision to have your unit replaced. 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. Thats why you should take the time to test the ECM computer by process of elimination. When connected properly the voltage of the capacitors terminal should be 1.7 times the voltage of the power supply. This guide will show you how to test ECM with a multimeter easily and quickly. The multimeter should be in AC voltage mode. This also helps you avoid any difficult issues around the engine control unit computer. If these checks don't resolve the problem, or if the fault code reveals a motor problem, then it's time for some additional diagnostics. endobj Continue with Recommended Cookies. But if you want to test your car ECU computer, you have to have some specialized knowledge and experience of testing an ECM computer. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. The sensors connected to your car ECU computer cannot make the correct adjustment when your battery voltage is low or not right. 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. A new ECU needs to be programmed into your vehicle because the ECU computer needs to be programmed for your cars model and make. 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. All rights reserved. Invented by a real HVAC technician looking for a simple way to check if an Electronically\rCommutated Motor was good or bad in order to make a \rquicker diagnosis for the necessary repair. 24 VAC operating voltage 24\" wire length Short circuit protection Convenient magnetic case No batteriesAs a manufacturer, SUPCO supplies to Wholesale Distribution only. An engine control unit (ECU), also known as the engine control module (ECM). Follow the process of testing ECU step by step, and you will get the precise test result of your engine control unit computer. Manage Settings It should be between 12 and 16 volts. The wide range of the ECM motor, high efficiency, and programmability gives it a virtually unlimited range of performance characteristics. Now, connect the remaining two black probes of the C and D to the end of the extension cable. The best way for a deduction to be made is by making sure that all the sensors and actuators are functioning properly; we need to ensure that the sensors are supplying the correct amount of power to the ECM and that all components are able to receive the correct signals that the computer provides. A25464 "The Electric steering lock has a malfunction. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. Although installation of the part itself is a straight-forward process, testing the vehicle after installation to ensure everything is running properly can be time-consuming. This process is automatic. A faulty engine control unit can bring various issues to your car, such as sudden shut-off, car wont start, and poor engine performance. Lives In: Denver Colorado Here we are going to discuss all three motor tests. On older vehicles, typically models 1995 and older, switching your ECM for another unit is a sufficient mode of testing. You better remember An ECM is one of the essential components to run the car. Check the setting of the jumper pins or DIP switches on the manufacturer's control board. Hello, I'm Sam. In this case, you might have to replace the motor. Correct any voltage issues before proceeding. Be on the lookout for dirt, metal shavings, and oil. The primary purpose of the engine computer is to ensure that your vehicle is running smoothly and efficiently. No matter what you do to your engine control unit (ECU), whether you reflash your car ECU or test the ECU with a multimeter, you have to conduct a visual inspection around the ECU computer. Flagship One Inc, is the world leader of engine control module repairs, programming and testing, feel free to contact us if you have any question or concerns. While there are some expenses that you cannot avoid when repairing your vehicle, there are ways to cut costs and ensure you are getting the best deal possible in quality as well as value. Save my name, email, and website in this browser for the next time I comment. Connect the black wire of the multimeter to the ground circuit and the red lead to the MAF sensor. 2023 Endeavor Business Media, LLC. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media. 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. Connector pin outs. If the motor runs the problem is in the low voltage thermostat wire. A25408 "The Electronic steering lock has a malfunction. Dealership grade equipment is also used to program these units so there is no reduction in engine performance. 1. 2. You can also test your car ECU at home and by yourself using on-board diagnostics 2 readers or a scanner. The engine control unit (ECM) controls some of the main parts of your cars operating system: Fuel injection, idle speed, and ignition timing. How Much Does it Cost to Replace Your Engine Control Module? Turn the ignition key to the on position. For further visual inspection to test the ECU computer, you might need to open up the Engine Control Unit (ECU) board for further visual inspection. Tech Tip 1: Don't automatically assume the ECM motor has failed. I will help you to get solutions for your car through this website. If all the connections are good, you will get a reading of 1.7 times the power supply reading. Now you need to see if the output units are working properly or not.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'caralso_com-leader-4','ezslot_15',125,'0','0'])};__ez_fad_position('div-gpt-ad-caralso_com-leader-4-0'); Ensure the Injector, the Starter, and the Spark Plugs get the right signal from the ECM computer. A compatible ECU will always help you to diagnose an ECU properly. The service requires full JavaScript support in order to view this website. An example of data being processed may be a unique identifier stored in a cookie. Touch the two test leads to the two electrical connections. The same way that wear and tear on mechanics happens over a period of time, strain can also as efficiently as possible. Remember, this car computer testing process is only for old cars containing OBD I, not modern cars.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'caralso_com-leader-2','ezslot_13',123,'0','0'])};__ez_fad_position('div-gpt-ad-caralso_com-leader-2-0'); To diagnose the car computer, the process of elimination is a very useful way. Tech Tip 3: A True-RMS meter isn't needed to check high-or low-voltage to the motor. ECM Service Tech Tips. OBD or OBD II Code Scanner OBD II Code Scanner As a car owner, you should know what an OBD code scanner is. When you test your car ECM computer or car computer, you also need to understand the engine computer failure indication. 6106 No CAN message was received from control unit Combustion engine or transmission I show you where the test voltage goes and how to. When it comes to determining if your control modules ECM is faulty, the goal is to make sure that there is an issue within the computer itself- that there is an issue with how the ECM ( Engine control modules ) is processing the data and not an issue with the sensors sending the data or an issue with the actuators receiving the data. 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. Look for loose plugs and/or loose pin connections in the plug, and for burnt, bent or loose pins or seats. If your car engine computer needs to be repaired instead of replaced then that will also add to the amount of labor required. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. After opening up the ECU board, If you see any broken components or corrosion, the ECU computer will need to be replaced. If you are still confused, study the diagram shown above. The best way to check a treadmill's motor is to use the treadmill itself. If you get a reading according to the ratio mentioned above, that means the motor is getting proper voltage. For every version of ECM computer resetting and testing processes are the same. 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}. If any of these is present, clean them out. Energize the circuit, and the amperage value appears on the display. Ive been studying automotive for around 9 years now. The price range of a multimeter is from $25 to $450. Figure 5. For a good understanding, here is a simple guide. It is not intended to be technical advice and should not be treated as such, since situations, conditions, experience and skills are unique and vary widely. <>/Font<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 720 540] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> And after you put the replacement unit in your vehicle and communicate, that is a certain indication that tells your cars unit that it needs to be replaced. The primary purpose of the engine computer is to ensure that your vehicle is running smoothly and efficiently. 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 The tools needed for testing either a 2 or 3 wire speed sensor are essentially a multimeter with the clamp leads, and a drill. On the 120VAC systems, there should be a jumper between terminals one and two. 2,128. If they can't, lubricate them. They require a clamp accessory to measure motor inrush current. B210C16 "THE POWER SUPPLY IS OUTSIDE THE VALID RANGE. So, its essential to have a multimeter in your car. Privacy Policy. Connect both of the black probes to the black wire. One of the most important functions of an ECM is its ability to alert the driver when there is an issue with the vehicle. One thing to always keep in mind, however, is to always consult the manufacturer's guide to confirm proper configurations and demands. If your ECM computers software or code is going bad, it can be repairable, but if your ECM computer board is broken, then it wont be repaired; you have to change the ECM. In order to get those codes you will need to plug your scanner into the OBD-II port and from there it will notify you of any codes which are provided by the ECM so you can perform the proper diagnostic test.