Electro Viscous Fan - P1482 Cooling Fan Speed Sensor Circuit

How to troubleshoot an electronic clutch fan circuit on an Olds Bravada or Chevy Blazer with a 4.2L engine. This clutch fan has 5 wires. (2) output control (3) speed sensor input (hall effect design) Symptoms - check engine light (P1482 Cooling Fan Speed Sensor Circuit) - noisy fan Fix - replace blown fuse for the electro viscous fan Tests shown - how to test the computers output control of the fan circuit - how to test the fan speed sensor circuit - how to identify power and ground side switching - how to determine signal circuit design (pull-up or pull-down) Tools used - Bi-Directional Scan Tool Autel MaxiSYS MS908 Diagnostic System with Wireless VCI http://www.aeswave.com/cart.php?m=affiliate_go&affiliateID=60df1b5cf6e5582af6ff81c728f42d0d&go=http://www.aeswave.com/Autel-MaxiSYS-MS908-Diagnostic-System-with-Wireless-VCI-p9202.html - Lab Scope PicoScope 4425 4 Channel Standard Diagnostic Kit http://www.aeswave.com/cart.php?m=affiliate_go&affiliateID=60df1b5cf6e5582af6ff81c728f42d0d&go=http://www.aeswave.com/PicoScope-4425-4-Channel-Standard-Diagnostic-Kit-p9276.html Playlist - HVAC and Cooling systems troubleshooting https://www.youtube.com/playlist?list=PLAFYVCyenqco2yr65mNu24aiYT84-YBQy Related videos - GM MAF sensor circuit tests (a free ScannerDanner Premium video) https://youtu.be/mjgWcVcPP2M - Nissan-Infinity no start, no spark (hall effect crank sensor test) https://youtu.be/Ht12mWdrNbU - Chapter 2 (Switch Inputs) classroom lecture - an SD Premium preview https://youtu.be/HNa4iCziOzQ - How to test a computer controlled solenoid - power/ground side identification https://youtu.be/kQz3g4HIWgs - 2014 Subaru WRX O2 Heater Test (P0037, P0141) https://youtu.be/FaTGowykJYc For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book. Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium https://www.scannerdanner.com/join-scannerdanner-premium.html There is a 14 day free trial. On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere! Disclaimer: Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC 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 ScannerDanner LLC, 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 ScannerDanner LLC.