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. Tech Tip 1: Don't automatically assume the ECM motor has failed. In this case, you might have to replace the motor. After 1996 automobile manufacturers began using Onboard Diagnostics II (OBD2), a diagnostics system in the vehicle. Check the setting of the jumper pins or DIP switches on the manufacturer's control board. 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. You can now start the engine and let it idle. 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. This is the process for Circuit Tester A. If you need any help let me know. Reconnecting a connector the wrong way could damage the motor. When you see the car computer gets the proper voltage from the battery. 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. Knowing the battery voltage can help you to test ECU computer because your ECU cant work properly when the battery voltage is too low. You will not need to spend hundreds of dollars in any auto shop to test the ECU computer; if you have a compatible multimeter, you can do it by yourself at home. ECM 2.3 Troubleshooting: What is the motor doing or not doing? Most connectors are also keyed. Some of the common codes may be shown in your OBD II scanner: In order to test an ECM computer, you have to do a visual inspection around the ECM computer. After testing the fuse and relay, you will need to perform the amperage draw. 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. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[320,50],'caralso_com-box-3','ezslot_8',138,'0','0'])};__ez_fad_position('div-gpt-ad-caralso_com-box-3-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[320,50],'caralso_com-box-3','ezslot_9',138,'0','1'])};__ez_fad_position('div-gpt-ad-caralso_com-box-3-0_1');.box-3-multi-138{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}To test ECU with a multimeter, you have to have a compatible and working multimeter. I show you where the test voltage goes and how to. In the multimeter, there are variations such as digital multimeter and analog multimeter. The price range of a multimeter is from $25 to $450. Make sure you go through the diagnostic steps completely before replacing the motor. In the ohmmeter mode, connect the meter to the plug and monitor the resistance as you wiggle the cord where it enters the enclosure. Another thing you should keep in mind is that when you set up the multimeter, use the current breakers with one of the leads to keep your multimeter safe and avoid any accidents. So if you are driving an old car made before 1996, then with a simple swap, you can test the car ECM computer.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'caralso_com-large-mobile-banner-2','ezslot_12',122,'0','0'])};__ez_fad_position('div-gpt-ad-caralso_com-large-mobile-banner-2-0'); To swap to your car, first, you need to find a replacement unit that matches the original part number. An engine control unit (ECU) monitors most of the sensors in the engine bay to bring out the highest performance of your vehicles engine. Tech Tip 3: A True-RMS meter isn't needed to . On 240VAC systems, the jumper should be removed. Setting up your meter for a parasitic draw test. How do you test a blower motor with a multimeter? Diesel vehicles like Ford F250s and Dodge 2500s are among these vehicles that have expensive engine computers. The first step in testing your ECU with a multimeter is to get the multimeter ready for the test. If this is the only symptom identified, there is no need to replace the motor. The wide range of the ECM motor, high efficiency, and programmability gives it a virtually unlimited range of performance characteristics. You should receive a reading of zero or nearly zero. If the motor runs the problem is in the low voltage thermostat wire. 2 0 obj Here we are going to discuss all three motor tests. For this motor test, we are going to use two multimeters; Circuit Tester A and Circuit Tester B. 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. 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. People get confused to understand the difference between ECU and ECM or PCM or TCM, which is not really hard to understand. If your ECM is faulty then it will often throw codes for modules that are not faulty or will continue to throw codes for a faulty part even after that part is replaced. You can even test ECU with a multimeter which is not so hard. 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. Plug the red test lead into the amperage or "A" jack. Dec 5, 2009. Visual Inspection of the Control Module ECM When inspecting your control modules on your vehicle it is important to be conscious of any physical defects you may come across such as frayed wires or corrosion without the need to visit an auto repair shop. The primary purpose of the engine computer is to ensure that your vehicle is running smoothly and efficiently. But not here. If so, the following guide is for you. 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. The multimeter should be in AC voltage mode. 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. 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. After factoring in the cost of the part itself, the cost of labor must also be considered. Duct System Assumptions to Duck on Equipment Changeouts, Photo 79574657 Tashatuvango | Dreamstime.com. 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. Some of the OBD2 error codes are: ME Motor Electronics Locating the Camshaft Sensor/Crankshaft Sensor Now, connect the remaining two black probes of the C and D to the end of the extension cable. In cases like this, your only option may be to have your original unit repaired if possible. A swap is only effective for older cars. 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! Reminder: there is something that is a total failure in the ECU, and even the ECU itself can be a total failure when you test with a multimeter. On the other hand, Output contains the Spark Plugs, the Starter, and the Injector. Component pin outs. To test an ECM computer or car computer, you need to bring an Onboard Diagnostic (OBD or OBD II) scanner tool. The problem with these types of motors is that they use a lot of energy because they run at full amp draw at all times even during off-demand cycles. ECM Blower Motor Quick Test Fig. 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. They use high-speed, digital signal processing to filter out electrical noise and capture inrush current as the circuit protector sees it. On the other hand, if the motor does not pass the 2nd test, the problem is in the connector or the cable. 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. (Really? But below, you will see some of the most common ECM failure symptoms in a vehicle. The consent submitted will only be used for data processing originating from this website. 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. After you tested the ECU with your multimeter, now it is time for you to read the record of what you get from the ECU computer. Knowing what a multimeter is and how it works is always helpful before knowing how to test ECU with a multimeter. Try not to hurry when you open up the ECU board. If you follow these steps correctly, you can identify the condition of any motor. Oftentimes, a faulty ECM can be a result of a burnt circuit board due to poor wiring or other electrical mishaps. Place the amp clamp around the positive battery cable with the arrow on the amp clamp facing towards the starter. We can do this by tracing the voltage through each component. With some DIY skills and proper execution, you can get the task done pretty easily. If they can't, lubricate them. When you plug the OBD-II reader into your car engine control unit computer, you will get a bunch of codes that you will need to fix if there is any error code. For the example above, we used a 100V motor. Joined Jun 7, 2009. You will be redirected once the validation is complete. Connect pins 1 and 3 to the common side of the 24 volt transformer (fig. Using a Scanner and Process of Elimination. Mechanical problems such as faulty ball bearing can trouble the operation of your motor. Step 4 - Check starter motor current draw. Of course, the increasing popularity of the ECM motor has led to a number of questions from technicians on how to service and troubleshoot ECM-driven systems. However, if you dont get such a reading, there might be an issue with your motor. If fault codes are present, consult the manufacturer's recommendations to resolve the problem. You can test your VSS to make sure it's functioning properly by using a device called a multimeter. In this test, we are going to measure the winding resistance of the motor. There are two types of multimeter: analog multimeter and digital multimeter. An engine control unit (ECU), also known as the engine control module (ECM). If you are still confused, study the diagram shown above. Make sure that there is no call for "continuous fan" on the G terminal. Now connect the red probe of Circuit Tester E to the red wire. Make sure you do this by pulling on the metal connectorsNOT the wires. 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. In input process elimination, The battery has a major role. You can conduct a test with a multimeter using the following three steps. <>/Font<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 720 540] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> After the required connections are made, you apply the test voltage for a period of one min. So, follow these steps. You should also get an OBD-II scanner because this tool is so useful. #11. you would test your insulation with a megger. B162A15 The Left low Beam has had a malfunction. But, you should keep in mind that Labor costs and a new ECM purchase cost can also depend on your state. According to GE, an innovator in ECM technology, the wide range of the ECM motor, high efficiency, and programmability gives it a virtually unlimited range of performance characteristics. A faulty motor can cause a lot of trouble. The consent submitted will only be used for data processing originating from this website. With all of these ways, you can test your car ECM computer. So, lets know the caution to test ECU with a multimeter. Although labor is the bulk of the expense when replacing your engine control module at a dealership or mechanic, it is possible to cut costs on the actual part itself. Thats why if you dont have enough knowledge or experience, you should leave the testing ECM to a professional.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'caralso_com-mobile-leaderboard-2','ezslot_19',128,'0','0'])};__ez_fad_position('div-gpt-ad-caralso_com-mobile-leaderboard-2-0'); The average cost to replace ECM is around $1000 before taxes and fees; a new engine control module (ECM) costs you $700 to $900, and labor costs between $85 to $150. 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. No matter how you test the engine control module, finding the right issues in your car is the main job.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[468,60],'caralso_com-netboard-1','ezslot_23',131,'0','0'])};__ez_fad_position('div-gpt-ad-caralso_com-netboard-1-0'); So, if you dont have proper knowledge about testing ECM computer, you should learn from a professional. Step 2: Then, turn the shaft clockwise and counterclockwise. Using alligator clip accessories on the test leads is often best for securing test leads in place. The service requires full cookie support in order to view this website. The price of a multimeter depends on quality and precision. Thats why you should take the time to test the ECM computer by process of elimination. Follow the process of testing ECU step by step, and you will get the precise test result of your engine control unit computer. The multimeter should be in AC voltage mode. If there is a problem with the engine computer then it will not process the data correctly and it will affect the way the outputs function. 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. I am a Car Mechanic and a student of Automobile Restoration here in Florida, USA. Please Tell Us How We Can Improve This Article. This guide will show you how to test ECM with a multimeter easily and quickly. I show you where the test voltage goes and how to check if the Fan Motor is good or bad. The following process of testing ECU with a multimeter is one way you can run a test. 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. One thing to always keep in mind, however, is to always consult the manufacturer's guide to confirm proper configurations and demands. 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. Using a multimeter set on the Ohm scale, use the positive lead and test the black wire. If there is no resistance or the resistance is uneven, the motor is likely faulty. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); The world's top supplier of programmed OEM (Original Equipment Manufacturer) Powertrain Control Modules (PCM), Engine Control Modules (ECM), Injection Control Modules (IDM), Body Control Modules (BCM), Transmission Control Modules (TCM), Engine Control Units and all other car control units. 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. We and our partners use cookies to Store and/or access information on a device. A new ECU needs to be programmed into your vehicle because the ECU computer needs to be programmed for your cars model and make. These are the components that will need to be checked to test a car computer. Replacing an Engine Control Module (ECM) is simple, and you dont need to know too much about it. So, you never know when you may have to test your motor. Verify that the correct thermostat input voltage is present at the interface of the main control board on the furnace or air handler. Whether you are driving a car or a truck, an ECU is essential for your vehicle. If removing the filter corrects the problem, clean or replace with a less restrictive filter. When you get a reading that is equal to 1.7 times the power supply, that means the motor is working properly. Remember that the change in airflow between continuous-fan speed and low stages of operation may be very slight depending on the size of the system. Digital multimeters (DMMs) measure two or more electrical values, such as voltage, amperage, or resistance. What's a Realistic Conversion Rate for Service Agreement Sales? That is why today we are going to look at how to test a motor with a multimeter. OBD II readers are widely popular worldwide, and almost every car owner has them in their car. If you need any help let me know. A faulty engine control unit can bring various issues to your car, such as sudden shut-off, car wont start, and poor engine performance. Note: While testing wires, always choose a location that is exposed and close to the motor. Connect the OBD II scanner tool to the diagnostic port of your car, which will let you know whether or not there are any issues in your car by codes. 1. If you are experiencing problems like loss in fuel economy and engine performance then you may only need to have your unit reprogrammed. Here are simple steps to follow when using your multimeter to test your ECU: Set Up Your Multimeter. But if you want to test your car ECU computer, you have to have some specialized knowledge and experience of testing an ECM computer. Look on the outside of the motor for other potential problems, like holes or smoke points. A visual inspection will also help you to detect any external error in the ECU. ECM control modules are factory programmed for specific manufacturer applications. You should also get a good quality digital multimeter. Grab your digital multimeter and set it to DC volts. To check the purple wire for current, use your ignition key and turn it to the run setting, turn the heater power to full power and set the multimeter to DC power. Check the diagram above and connect Circuit Tester C and D accordingly. Privacy Policy. If any of these is present, clean them out. 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. Wait for programmed delays to time out. Please enable cookies on your browser and try again. And both of the tools you as a car owner should have in your vehicle. 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. Some vehicles are notorious for their engine computers tendency to become fried due to faulty spark plugs. The motor should run. 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. (2). 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. Make sure the power to the component; otherwise, you wont find circuit reading. So, if you have proper knowledge about testing an ECM, program software, and tools, you can test your ECM at home without any difficulty. However, for this process, you need some DIY skills. As a result it may sound like a dealership is unavoidable, however, there are companies that specialize in the procurement and programming of engine computers. ECU is an electronic device that controls vehicles electrical features to ensure optimal engine performance. WTWH Media LLC and its licensors. 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}. A25408 "The Electronic steering lock has a malfunction. Tech Tip 3: A True-RMS meter isn't needed to check high-or low-voltage to the motor. Afterward, we can check the motors condition according to the two values. Thats why without an ECU, the car cannot be running. If the motor works, the belt will move. There is a short circuit to positive e or an open circuit. Electrical engineering is my passion, and Ive been in the industry for over 20 years. A failing engine control module is not something that should be taken lightly, your vehicle will perform on reduced power, your plug wires could be causing a short to the ECM so be sure to check them! Step 3: While rotating the shaft, if you can hear abnormal friction or a sound, it is a signal for misalignment or damage. An example of data being processed may be a unique identifier stored in a cookie. Here are the four steps on how you can test ECU with a multimeter: Step 1: Setup Multimeter Step 2: Visual Inspection Step 3: Start Testing With A Multimeter Step 4: Record The Reading Step 1: Setup Multimeter First thing you need to do when you are testing an ECU with a multimeter that properly set up the multimeter. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media. Online companies like Flagship One, Inc. have created a space where you can order the exact unit required for your vehicle and have it shipped to you. For every version of ECM computer resetting and testing processes are the same. Simply stated, if all inputs and outputs are in working order then you know the problem is a result of the way the computer itself is processing the data. 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. Please comment and ask for videos that you would like to see in the future! 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