On the other hand, if the motor does not pass the 2nd test, the problem is in the connector or the cable. It is solely up to the technician viewing this to determine if he/she has the proper safety training and experience needed to work on HVACR systems and components examined in this video. Yvc,Nl{nNibb)4AZ:1H;. ]^g^uRn~G. The other way to test the motor is to lift one end of the motor assembly, put it on a surface with some vibration, and then move the belt. Plug the red test lead into the amperage or "A" jack. <> Start by setting the meter to the best available range. I am having issues with my Mercedes Benz C300 where the Vehicle starts up fine in cooler temperatures but it seems that as soon as it heats up and gets hot the car will shut itself down completely leaving no power to the dash/ instrument cluster, windows. Wait for programmed delays to time out. If so, the following guide is for you. Using a Scanner and Process of Elimination. If the motor works, the belt will move. Repairing an ECM depends on the issues with your ECM. When you start testing the ECU with multimeter you will need to test every component on it. Some modern garages have the tools to swap the old ECU program to the new ECU, but you might not get these tools in a typical garage. 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. x[KOI#X=|J9#vfm@BckFdPQ=/Ywg?4_NFuJ)m Connect the negative Meter lead to a good chassis ground in the vehicle and the positive lead to the suspected tachometer wire. OBD scanner is used to check the car vehicle engine and communicate all the possible glitches in the vehicle. With all of these ways, you can test your car ECM computer. When you start visual inspection on your car computer, the first thing to see is PINs. 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.. The gauges on the instrument cluster stay where they were when power is lost. ECM motors are dual voltage motors capable of operating in 120 or 240VAC systems. By elimination process, you will check almost all of the cars components, letting you know the current cars components situation. In this test, we are going to measure the winding resistance of the motor. If you follow these steps correctly, then you should get the voltage of the power supply. So, bring your multimeter and set-up for the circuit and ensure you use the circuit with the best range available multimeter gadgets. This will only be effective when working on an older vehicle. This guide will show you how to test ECM with a multimeter easily and quickly. . It should be between 12 and 16 volts. The service requires full cookie support in order to view this website. Testing Tachometer With A Multimeter ( 4 Step Guide) Step 1: Setting up the Multimeter In this first step, switch on your multimeter. Tech Tip 6: Always pull the connector and not the wires. 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. So, lets know the caution to test ECU with a multimeter. Knowing the battery voltage can help you to test ECU computer because your ECU cant work properly when the battery voltage is too low. Set your multi-meter to the Rx1 setting. Under the TradeFox brand, Supco helped bring their\r inventions to life through additional engineering and manufacturing. Here are simple steps to follow when using your multimeter to test your ECU: Set Up Your Multimeter. Unplugging and Cleaning the Sensor The first step entails removing the sensor from the engine block. #11. you would test your insulation with a megger. ), 3 Ways To Recondition A Car Battery That Wont Hold Charge. 2280 The power supply at the input of the control unit combustion engine has a malfunction, ESM Electronic Selector Module The cars Input contains the Ignition Switch, the Fuses, the Battery, and the Sensors. 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. This is typically shown as a "Hz" value on your multimeters turn dial. A25408 "The Electronic steering lock has a malfunction. Try and find it on the internet or ask the manufacturer. On the other hand, Output contains the Spark Plugs, the Starter, and the Injector. ********************************************** SUPCO TradeFox - Technician Invented. The car battery needs to be fully charged when you drive on the road. 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. Step 4 - Check starter motor current draw. So, you never know when you may have to test your motor. I was trained by parts changers that swap motor, modules, circuit boards til it works. (The one-min interval is an industry practice that allows everyone to take the reading at the same time. Save my name, email, and website in this browser for the next time I comment. For a good understanding, here is a simple guide. Try not to hurry when you open up the ECU board. Manage Settings If the motor fails Test 1, you might have to replace the wiring and the capacitors. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Testing an ECU cannot be so hard if you have a multimeter in your hand. 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 First, turn the power off. endobj And not only for testing an engine control unit, there are various components you can test with a multimeter (aka Volt Ohm Meter). If the motor runs the problem is in the low voltage thermostat wire. Onboard Diagnostic (OBD) is an engine code scanner that can access vehicle data. The wide range of the ECM motor, high efficiency, and programmability gives it a virtually unlimited range of performance characteristics. ), 3 Ways To Recondition A Car Battery That Wont Hold Charge. Remove the filter and check that all of the dampers, registers, and grills are open and free-flowing. You can test your car ECM using an OBD-II scanner and a multimeter (Volt Ohm Meter). Turn on the multimeter and set it to read voltage. If you test your car ECU with an On-Board Diagnostics II (OBD-II), you will get codes on the OBD-II scanner, and those codes notify the issues in your engine control module.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'caralso_com-leader-3','ezslot_17',154,'0','0'])};__ez_fad_position('div-gpt-ad-caralso_com-leader-3-0'); Using a Volt Ohm Meter known as a multimeter, you will read the amps on the multimeter. If all the connections are good, you will get a reading of 1.7 times the power supply reading. www.ecmweb.com is using a security service for protection against online attacks. 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. Thats why without an ECU, the car cannot be running. To test an ECM computer or car computer, you need to bring an Onboard Diagnostic (OBD or OBD II) scanner tool. Most connectors are also keyed. Condenser Fan Motors ; Contactors and Relays ; Cuber . In the multimeter, there are variations such as digital multimeter and analog multimeter. First, remove the additional components such as capacitors and extension cables from the motors circuit. Also, since the motors run on high speed all the time, the noise levels are also high. Pre-Programmed Engine Control Modules ECM. When an Onboard Diagnostic (OBD or OBD II) scanner shows you codes, you need to understand those codes to fix issues in your car. The process of elimination is done by checking the cars Inputs and Outputs. We and our partners use cookies to Store and/or access information on a device. How to Test a Single Phase Motor with a Multimeter (Guide), How to Test a Starter with a Multimeter (5-Step Guide), Can I Connect Red and Black Wires Together (Guide). The reason for this issue could be a bad motor, or it could be the bad components such as; bad relays, switches, cables, or the incorrect voltage. Thats why you should learn the whole process of testing an ECM computer in your car. 6106 No CAN message was received from control unit Combustion engine or transmission 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. 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}. For the example above, we used a 100V motor. <> This has happened while driving but usually happens when the key is removed from the ignition. Digital multimeters (DMMs) measure two or more electrical values, such as voltage, amperage, or resistance. Dec 5, 2009. Correct any voltage issues before proceeding. ECU is an electronic device that controls vehicles electrical features to ensure optimal engine performance. Thank you. This may result in misfires, the fuel pump not coming on, a lack of spark, etc. 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! 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. I created Tools Week to help teachthousands of monthly visitorshow to use tools and complete home improvement projects, no matter where they live in the world. An engine control unit (ECU) monitors most of the sensors in the engine bay to bring out the highest performance of your vehicles engine. 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. After testing the fuse and relay, you will need to perform the amperage draw. 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. 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. So, if you have proper knowledge about testing an ECM, program software, and tools, you can test your ECM at home without any difficulty. First thing you need to do when you are testing an ECU with a multimeter that properly set up the multimeter. This motor may take a while to come to a complete stop with selected delays and the normal ramp down. This also helps you avoid any difficult issues around the engine control unit computer. All rights reserved. Reconnecting a connector the wrong way could damage the motor. Any type of faulty wires or connectors can be the reason for a bad motor. Mechanical problems such as faulty ball bearing can trouble the operation of your motor. In addition to being time-consuming, replacing your ECM can be costly so it is important to be sure your vehicles problem truly lies within the ECM. A compatible ECU will always help you to diagnose an ECU properly. 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. So you can rely on my recommendation. 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. The radio, some lights, power seats still function. If you are still confused, study the diagram shown above. If fault codes are present, consult the manufacturer's recommendations to resolve the problem. THE LIMIT VALUE FOR ELECTRICAL VOLTAGE HAS NOT BEEN ATTAINED. WTWH Media LLC and its licensors. You can check your continuity with an ohm meter. 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. If the motor fails Test 03, you might have to replace the motor. A swap is only effective for older cars. 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. For me, studying and getting knowledge about automobile its really fun and entertaining. An example of data being processed may be a unique identifier stored in a cookie. I will help you to get solutions for your car through this website. 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. B219500 "THE POWER SUPPLY OF CIRCUIT 30 IS < 8.5 V Welcome to the Flagship One Official Blog TOP worldwide Engine Computer & Control Module supplier. stream If removing the filter corrects the problem, clean or replace with a less restrictive filter. We can do this by tracing the voltage through each component. ECM 3.0 is a communicating motor that consists of four (4) control wires connecting the board to the motor. If the motor does not run, remove the 16 pin plug from the IFC board. B162A15 The Left low Beam has had a malfunction. Afterward, we can check the motors condition according to the two values. U050400 Implausible Data were received from control unit left front door These are the components that will need to be checked to test a car computer. On older vehicles, typically models 1995 and older, switching your ECM for another unit is a sufficient mode of testing. You should not avoid maintaining the safety procedure to test the engine control unit, and you need to read the caution carefully. 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. #what is meggar#insulation resistance measure by meggar#measuring instruments through meggar#Meggarhow to test a motor with meggerhow to test a motor using a. www.ecmweb.com is using a security service for protection against online attacks. On 240VAC systems, the jumper should be removed. Crank the engine for several . However, if you dont get such a reading, there might be an issue with your motor. When you test your car ECM computer or car computer, you also need to understand the engine computer failure indication. In cases like this, your only option may be to have your original unit repaired if possible. 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. 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. The tools needed for testing either a 2 or 3 wire speed sensor are essentially a multimeter with the clamp leads, and a drill. If your amp clamp has a max recording feature select it. Cookie Notice A multimeter loads the circuit under test to some extent, with full-scale deflection of 50 microamps (amps) or "ohms per volt." Here are four simple steps you need to consider while diagnosing the ECU system of your car: Get your multimeter and set it up to test for the circuit using the best range available multimeter gadgets. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'caralso_com-box-3','ezslot_6',138,'0','0'])};__ez_fad_position('div-gpt-ad-caralso_com-box-3-0');You better remember, ECM Computer, car computer, Engine control module computer are the same, people say what they are accustomed to. Be on the lookout for dirt, metal shavings, and oil. Diagnostic manual comes with: Wiring diagrams. Once you have determined the codes you want to use process of elimination to deduce whether the computer is at fault. 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. After reading this post, I could check my ECM (thank God my car just had bad spark plugs). Check the setting of the jumper pins or DIP switches on the manufacturer's control board. <>>> ECM 2.3 Troubleshooting: What is the motor doing or not doing? Energize the circuit, and the amperage value appears on the display. There are two types of multimeter: analog multimeter and digital multimeter. Touch the two test leads to the two electrical connections. For Step 2, a simple swap can be done. On most autos, the MAF sensor should read between 0.5 and 0.7 volts while the engine is idling. endobj The price range of a multimeter is from $25 to $450. 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.. If you follow these steps correctly, you can identify the condition of any motor. 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. 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. There are also a few checks you can perform if the ECM motor is not running. Reference voltage always goes to the car computer or Engine control unit (ECU) computer. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'caralso_com-large-mobile-banner-1','ezslot_9',110,'0','0'])};__ez_fad_position('div-gpt-ad-caralso_com-large-mobile-banner-1-0');If you read less than 12.6 volts with the car engine off and 13.7 volts with the engine running, you should recharge the battery and re-test the voltage with a multimeter. Look for loose plugs and/or loose pin connections in the plug, and for burnt, bent or loose pins or seats. Locating the Camshaft Sensor/Crankshaft Sensor You should first take out the ECM to make sure the pins are in an upright position and check inside the plug and casing to make sure there is no corrosion for all wire connection . 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. Please enable JavaScript on your browser and try again. Place the amp clamp around the positive battery cable with the arrow on the amp clamp facing towards the starter. 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. So, when you notice these issues in your car, you should test the ECM properly and quickly. Tech Tip 7: When checking any plug connector, the meter leads are most likely larger than the terminals or socket. For instance, if you are using a 100V motor for this test, you will get a 170V reading on the multimeter. Please Tell Us How We Can Improve This Article. Make sure you do this by pulling on the metal connectorsNOT the wires. 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. Hey there,How is it going?Im Meraj Sarker. I hope you enjoy and find them very beneficial! 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. 3 0 obj Make sure you go through the diagnostic steps completely before replacing the motor. 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. Before 1996 car manufacturers made cars with Onboard Diagnostic (OBD I), which did not require programming. Connect the black wire of the multimeter to the ground circuit and the red lead to the MAF sensor. In this case, you might have to replace the motor. Both of these motors will have a high voltage harness as well. The 3 wire speed sensor is externally powered, so you will need a power source of some form. But, you should keep in mind that Labor costs and a new ECM purchase cost can also depend on your state. While other components may normally display clear-cut symptoms when faulty, symptoms within your engine computer may not be as obvious. However, according to each test, the solutions may vary. A PCM can be tested with a multimeter this process is used to measure the amount of current passing through to the PCM from the battery at a time. First, you have to test the fuse and relay with your multimeter. This is followed up by ensuring that you put your multimeter on frequency mode. A professional knows the proper way to test an ECM computer, and if you learn the process once, you should be able to test ECM by yourself at home. For more information, please see our I think that I can handle this problem well on my own in the future. A faulty motor can cause a lot of trouble. 4). h6 hHvih8;zbLE|\0&tN]%3y MYa}l*ahs,7[J;S-,- :W^=?.b{O>[.B{p;-Unv|@{%uWrvN 7#.7xg73F$=wa8+vr4oG9XP2;}^. Using thin leads will prevent the terminals from being damaged by a voltage check. (2). https://www.trutechtools.com/?affid=43 Use our Promo Code: \"acservicetech\" for 8% off your order! If you use a 100 VAC motor, you will get 100V reading on the multimeter. Check the diagram above and connect Circuit Tester C and D accordingly. And, be sure to always disconnect the main power to the unit when making these adjustments. Apart from the method above, there are two other different methods by which we can test an electric motor. I am a Car Mechanic and a student of Automobile Restoration here in Florida, USA. Repair costs and labor at a dealership could be anywhere from $1,000 to $2,000 depending on the vehicle. 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. You can conduct a test with a multimeter using the following three steps. Just like in the diagram shown above, first, connect the red probe of the multimeter to the red wire; connect the black probe to the black wire. Once the control module is installed then the unit must be programmed to match the vehicle its being installed in which requires expensive software and equipment. What's a Realistic Conversion Rate for Service Agreement Sales? Observe the voltage reading on the multimeter. And an ECM computer is an expensive part of your car. 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. Then connect the black probe to the white wire. There is an implausible signal" X]@u;v\(}%VH?!}v}P'!pK\R+=Z;+&(xe d. In addition to being time-consuming, replacing your bad ECMs can be costly so it is important to be sure your vehicles problem truly lies within the ECM. Tech Tip 1: Don't automatically assume the ECM motor has failed. Turn the ignition key to the on position. Tech Tip 3: A True-RMS meter isn't needed to . Check your car battery voltage using a multimeter with the engine off and engine on. From the GE ECM Service Guide, https://www.linkedin.com/company/contracting-business-mag/, AHR 2023: The Importance of Training and Certification.

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