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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)

Engine Performance Diagnostics

Topics discussed

symptoms

  • check engine light (P1482 Cooling Fan Speed Sensor Circuit)
  • noisy fan

fix

  • replace blown fuse for the electro viscous fan

test 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

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Playlist

HVAC and Cooling systems troubleshooting

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Nissan-Infinity no start, no spark (hall effect crank sensor test):

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Chapter 2 (Switch Inputs) classroom lecture - an SD Premium preview:

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How to test a computer controlled solenoid - power/ground side identification:

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2014 Subaru WRX O2 Heater Test (P0037, P0141):

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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available 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. 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!