The tests shown in this video can be used for any 3-wire cam or crank sensor. The P0336 code was caused by the crank sensor connector being left unplugged. So rather than just plug the sensor back in and clear the codes, I decided to take this opportunity to show you how to test the crank sensor circuit on this car. (1996 GM 3100)

There are two crank sensors on these early GM 3100 engines. One is a 2-wire magnetic type sensor that GM calls a 7x crank sensor. (7 pulses per 360 degrees of crank rotation). The second is a 3-wire hall effect type sensor that GM calls a 24x crank sensor (24 pulses per 360 degrees of crank rotation). This is the one we will be focusing on for this video.

Engine Performance Diagnostics Chapter 21 pages 20-28

symptoms 50

  • Check engine light (P0336)

fix 50

  • reconnect sensor connector

test shown enh 50

  • how to verify wiring integrity on a pull-up type hall effect using a test light and scan data
  • how to determine hall effect circuit design (pull-up or pull-down) which is critical in knowing
How to perform a proper bypass test:
  • how to perform a hall-effect bypass test
  • how to check powers and grounds to a hall effect
  • what does a digital square wave signal look like on a digital voltmeter
  • a frequency graph compared to the actual signature of the waveform

Tools used

  • lab scope
  • incandescent test light
  • scan tool

end faq

Playlist

(Chapter 21) Ignition inputs, cam and crank

Related videos:

Hall effect cam/crank sensor tests Part 1 (ScannerDanner Premium lecture):

Hall effect cam/crank sensor tests Part 2 (ScannerDanner Premium lecture):

How to test a crank sensor on a GM 3800 engine (3x and 18x signals):

end faq

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!

You have no rights to post comments