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How to test a crank sensor with a voltmeter

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The tests shown in this video apply to camshaft, crankshaft and vehicle speed sensors on ALL Chrysler models, in all production years. The vehicle being tested is a 1997 Jeep with a 4.0L engine.
Chrysler has changed very little in regards to their hall effect sensors throughout the years. Older systems used an 89v reference circuit (power supply), where the newer systems use 5v. And with all of them, the signal circuit is a 5v pulldown design.

Engine Performance Diagnostics chapter 21 pages 2029

Tests shown
how to check a crank sensor with a voltmeter
what does an on/off digital signal look like on a voltmeter
how to check the 5v reference and ground to the sensor
how to perform a bypass test
how to verify signal circuit integrity

Tools used
digital multimeter
jumper wire
backprobing pins
incandescent test light
scan tool

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Playlist
(Chapter 21) Ignition inputs, cam and crank
   • (Chapter 21) Ignition inputs, cam and...  

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.
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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.

posted by rofun01cl