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There is an implausible signal" Then test the motor terminals and wires. Certifications: B.E.E. Dec 5, 2009. How to Use Multimeters Effectively | EC&M On older vehicles, typically models 1995 and older, switching your ECM for another unit is a sufficient mode of testing. The aim is to check the windings for open or shorts circuit. Afterward, compare the two values. *****TECHS**** Find your nearest SUPCO distributor here: http://bit.ly/2ZB0cd8Learn more: https://www.supco.com/web/supco_live/products/ECMPRO.htmlThis product update video contains general technical information provided for educational use only. 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. 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. Because OBD-I engine computers do not require programming upon installation, they will start and run your vehicle once installed. Just wondering how you guys are testing ecm blower motors in furnaces. If you need any help let me know. Using thin leads will prevent the terminals from being damaged by a voltage check. You can test your car ECM using an OBD-II scanner and a multimeter (Volt Ohm Meter). B219500 "THE POWER SUPPLY OF CIRCUIT 30 IS < 8.5 V For every version of ECM computer resetting and testing processes are the same. 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. 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.