how to test ecm motor with multimeter

Pre-Programmed Engine Control Modules ECM. Tech Tip 7: When checking any plug connector, the meter leads are most likely larger than the terminals or socket. 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. 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. An OBD scanner is a device that can read your car data and memory and diagnose the error. B126322 "Control unit N10/1 front SAM control unit with fuse and relay module has received no LIN message from component Compas module One of my career paths started as a general handyman, so I also have a lot of experience with home improvement I love to share. 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). There is a short circuit to positive e or an open circuit. These are the components that will need to be checked to test a car computer. If you are experiencing problems like loss in fuel economy and engine performance then you may only need to have your unit reprogrammed. 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. Note: While testing wires, always choose a location that is exposed and close to the motor. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Tech Tip 1: Don't automatically assume the ECM motor has failed. When checking low-voltage connections, always use the C terminal on the board, never on the ground. Plug the probes from the multimeter into the two wires you identified coming out of the evaporator motor together, then turn the multimeter on and set it to resistance, or Ohms. Onboard Diagnostic (OBD or OBD II) scanner manufacturers are constantly updating OBD II scanners for better performance. When you get a reading that is equal to 1.7 times the power supply, that means the motor is working properly. %PDF-1.5 Link the red probe to the red wire. 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. Using a Scanner and Process of Elimination. 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. Digital multimeters (DMMs) measure two or more electrical values, such as voltage, amperage, or resistance. 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 . And the vehicle temperature is determined by the computer. Check your car battery voltage using a multimeter with the engine off and engine on. Knowing the battery voltage can help you to test ECU computer because your ECU cant work properly when the battery voltage is too low. Now you need to turn the key on and see the driver supply; if the driver supplies power, then move the meters negative lead over to the positive battery post precisely. 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. 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. What's a Realistic Conversion Rate for Service Agreement Sales? (1). B127A54 "Component compass module is not calibrated", EZS Electronic Ignition Lock ECU is an electronic device that controls vehicles electrical features to ensure optimal engine performance. A Range of multimeter gadgets also will be required to test ECU. On 240VAC systems, the jumper should be removed. However, for this process, you need some DIY skills. Particularly, OBD-I where Engine Computer does not require Programming. 1. Programming and updates installed are also responsible for optimizing the engines performance. On the other hand, Output contains the Spark Plugs, the Starter, and the Injector. Most connectors are also keyed. Connector pin outs. ECU computers collect data from several sensors, and with data, ECU regulates the cars operating system.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'caralso_com-medrectangle-4','ezslot_1',103,'0','0'])};__ez_fad_position('div-gpt-ad-caralso_com-medrectangle-4-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'caralso_com-medrectangle-4','ezslot_2',103,'0','1'])};__ez_fad_position('div-gpt-ad-caralso_com-medrectangle-4-0_1');.medrectangle-4-multi-103{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}, A multimeter is a tool that is used to measure electrical values such as principally voltage (volts), current (amps) and resistance (ohms), and more. How to Easily Test an ECM Motor Using the SUPCO TradeFox ECMPRO Universal Tester Sealed Unit Parts Co. 2.08K subscribers Subscribe 8.2K views 2 years ago Test any type of Electronically. Step 1 - Check the Power Supply Voltage with Circuit Tester A 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. If they can't, lubricate them. I reset and test my ECM after every new major install and so should you. 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. All rights reserved. Afterward, we can check the motors condition according to the two values. 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. The service requires full cookie support in order to view this website. The tools needed for testing either a 2 or 3 wire speed sensor are essentially a multimeter with the clamp leads, and a drill. Please Tell Us How We Can Improve This Article. Once installed, drive your vehicle for a complete drive cycle to ensure the issues you were experiencing with your original unit do not return. Tech Tip 5: If a check of the control module indicates replacement is required, then also check the motor module. Some of the OBD2 error codes are: ME Motor Electronics So you can rely on my recommendation. If fault codes are present, consult the manufacturer's recommendations to resolve the problem. 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. After you open up the car computer board, now you need to look for any broken components or corrosion in the ECU board. These Videos are all part of our Training Series on HVACR Service, Installation, Preventative Maintenance, General Knowledge, and Tips. 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. If the motor fails Test 2, you might have to replace the connector and the cable. Proper knowledge about your car ECM computer will help you to maintain your car properly. There are various ways to test an engine control module (ECM). To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. ECM motors are dual voltage motors capable of operating in 120 or 240VAC systems. This guide will show you how to test ECM with a multimeter easily and quickly. Then, connect the red probe of Circuit Tester F to the white wire. A swap is only effective for older cars. People get confused to understand the difference between ECU and ECM or PCM or TCM, which is not really hard to understand. Check the bearings to make sure they can spin freely. We come out with new videos every few days from my job sites, service calls, and the training shop! Now, connect the remaining two black probes of the C and D to the end of the extension cable. Any fluctuation in the digital readout may point to a defect. Ive been studying automotive for around 9 years now. Tech Tip 6: Always pull the connector and not the wires. Take a look at some of our related articles below. With this method, we are going to check whether the motor circuit is closed or open with a simple continuity test. If there are any breaks on the checked circuit, the multimeters will start beeping. 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. It should be between 12 and 16 volts. And an ECM computer is an expensive part of your car. 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. So, you never know when you may have to test your motor. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Lives In: Denver Colorado The process of elimination is done by checking the cars Inputs and Outputs. I will help you to get solutions for your car through this website. The multimeter is most commonly used for measuring the battery voltage and diagnosing faulty components and complex diagnostics. Then test the motor terminals and wires. and our 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. The cars Input contains the Ignition Switch, the Fuses, the Battery, and the Sensors. To do that, you have to connect Cs red probe to the black wire and Ds red probe to the red wire. " 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! When you start testing the ECU with multimeter you will need to test every component on it. However, according to each test, the solutions may vary. A faulty ECM may also display similar symptoms as other faulty components making it difficult to determine where the symptoms originate. But, when it comes to other motors, you will have to find out the designed values according to the model. Plug the red test lead into the amperage or "A" jack. Now check the voltage of the multimeter. A visual inspection will also help you to detect any external error in the ECU. For this motor test, we are going to use two multimeters; Circuit Tester A and Circuit Tester B. For me, studying and getting knowledge about automobile its really fun and entertaining. Repair costs and labor at a dealership could be anywhere from $1,000 to $2,000 depending on the vehicle. The reference voltage was not available in the past, but now its a very essential and familiar use in the car. Step 4 - Check starter motor current draw. If the motor fails Test 1, you might have to replace the wiring and the capacitors. OBD II readers are widely popular worldwide, and almost every car owner has them in their car. If the issues do not return after test driving the vehicle then that is a good indicator that there was an issue with your original unit. ECM Motor Testing. Step 2: Then, turn the shaft clockwise and counterclockwise. We and our partners use cookies to Store and/or access information on a device. Save my name, email, and website in this browser for the next time I comment. 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. If all the connections are good, you will get a reading of 1.7 times the power supply reading. 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.