Mastering Diagnostics #13: Voltage Drop- The circuit stress test
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3 ماه پیش
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NOTE: The last of the
NOTE: The last of the video has glitched and I wish to summarize here. With a failed fuel pump there is no way to verify the circuit is healthy until it functions. A normally functioning pump will spin as designed and produce counter voltage. A slow pump will not produce the counter voltage and can suffer damage to the brushes/commutator from current flow/heat. That would typically mean the pump would need to be replaced before retesting can commence. If not, the new pump will suffer.
However, substituting a similar current load will stress the circuit and flush the fault to the surface. this will allow you to find the underlying fault before replacing the pump, in this case. the prevents comebacks from occurring.
Motor Age Technical Editor, Brandon Steckler is back again for Mastering Diagnostics in episode number 13. In this episode, Brandon discusses the importance of stress testing the circuit of an inoperative component before committing to the actual repair.
In many situations, a vehicle will present with an inoperative component (like a fuel pump, for example). Many technicians find that the fuel pump's internal circuity is electrically open or has extremely high internal resistance.
As a result, the faulty fuel pump is replaced but the technician discovers (only after replacement) that the circuit still doesn’t function. And here is where the technician went wrong. An open fuel pump will not allow current to flow (and that is the reason for replacement) however, there would be no way to detect an underlying circuit issue (like a poor ground connection or poor contact in a relay).
It's never a great situation when we as technicians or service advisors must face the customer a second time, and in this case, tell them that the $400 fuel pump we had just condemned and replaced still has not corrected the issue.
Follow Brandon through this valuable lesson on Ohm’s law, or more importantly, how voltage drop, resistance, and amperage all relate to each other. Learn how to implement a testing technique that will discover underlying circuit faults, even if the circuit doesn’t function at that time. Make the accurate diagnosis THE FIRST TIME and prevent comebacks, regardless of the vehicle type or circuit being addressed.
There's lots more from Motor Age! Check out our video library at
www.youtube.com/MotorAgeMagazine?sub_...
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https://endeavor.dragonforms.com/load...
Each issue is packed with in-depth technical articles from experts, brief tech tips and repair strategies, TSBs, and much, much more!
DID YOU KNOW? Motor Age offers a library of ASE Certification training materials. Motor Age Training's books, practice tests and video resources is edited by ASE Master Technicians with years of experience in repair processes. Each product is designed to help you prepare for and pass your ASE certification exam – GUARANTEED. CLICK HERE TO FIND OUT MORE:
https://motoragetraining.com/
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Due to factors beyond the control of Endeavor Business Media, it cannot guarantee against unauthorized modifications of this information or improper use of this information. Endeavor Business Media assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Endeavor Business Media recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of Endeavor Business Media, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not Endeavor Business Media.
The tool and/or equipment featured in this video was supplied by the manufacturer and may or may not be retained by the reviewer at no cost.
However, substituting a similar current load will stress the circuit and flush the fault to the surface. this will allow you to find the underlying fault before replacing the pump, in this case. the prevents comebacks from occurring.
Motor Age Technical Editor, Brandon Steckler is back again for Mastering Diagnostics in episode number 13. In this episode, Brandon discusses the importance of stress testing the circuit of an inoperative component before committing to the actual repair.
In many situations, a vehicle will present with an inoperative component (like a fuel pump, for example). Many technicians find that the fuel pump's internal circuity is electrically open or has extremely high internal resistance.
As a result, the faulty fuel pump is replaced but the technician discovers (only after replacement) that the circuit still doesn’t function. And here is where the technician went wrong. An open fuel pump will not allow current to flow (and that is the reason for replacement) however, there would be no way to detect an underlying circuit issue (like a poor ground connection or poor contact in a relay).
It's never a great situation when we as technicians or service advisors must face the customer a second time, and in this case, tell them that the $400 fuel pump we had just condemned and replaced still has not corrected the issue.
Follow Brandon through this valuable lesson on Ohm’s law, or more importantly, how voltage drop, resistance, and amperage all relate to each other. Learn how to implement a testing technique that will discover underlying circuit faults, even if the circuit doesn’t function at that time. Make the accurate diagnosis THE FIRST TIME and prevent comebacks, regardless of the vehicle type or circuit being addressed.
There's lots more from Motor Age! Check out our video library at
www.youtube.com/MotorAgeMagazine?sub_...
Receive your FREE SUBSCRIPTION to Motor Age here:
https://endeavor.dragonforms.com/load...
Each issue is packed with in-depth technical articles from experts, brief tech tips and repair strategies, TSBs, and much, much more!
DID YOU KNOW? Motor Age offers a library of ASE Certification training materials. Motor Age Training's books, practice tests and video resources is edited by ASE Master Technicians with years of experience in repair processes. Each product is designed to help you prepare for and pass your ASE certification exam – GUARANTEED. CLICK HERE TO FIND OUT MORE:
https://motoragetraining.com/
FOLLOW US ON FACEBOOK: Facebook: MotorAgeMagazine
VISIT OUR WEBSITE FOR EVERYTHING AUTOMOTIVE
http://www.vehicleservicepros.com
@@@@@@@@@@@@@@@@@
Due to factors beyond the control of Endeavor Business Media, it cannot guarantee against unauthorized modifications of this information or improper use of this information. Endeavor Business Media assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. Endeavor Business Media recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of Endeavor Business Media, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not Endeavor Business Media.
The tool and/or equipment featured in this video was supplied by the manufacturer and may or may not be retained by the reviewer at no cost.
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