How-to: diagnose a P0320 (crankshaft position sensor circuit failure)

This si a how-to video on the correct diagnois of a P0320 as applied to jeep/dodge/Chrysler cars and trucks. this was done on a 1997 jeep wrangler 2.5l 4 cylinder engine. you car or truck may not be exactly the same but the theories and principles are the same for the overall diagnosis. if you have any questions please feel free to email me, tweet at me @thejeepdoctor, find me on facebood and please check out my other videos. thanks!

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How to test a crank sensor with a voltmeter (All Chrysler models)
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 8-9v reference circuit (power supply), where the newer systems use 5v. And with all of them, the signal circuit is a 5v pull-down design. Engine Performance Diagnostics chapter 21 pages 20-29 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 Related videos - 1997 Dodge Neon no start, crank sensor problems - How to test a crank sensor (Chrysler Dodge Jeep) - How to test a cam sensor with a voltmeter (All Chrysler models) - 2003 Chrysler-Dodge 3 8L No Start (faulty crank sensor) For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at 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 right here on YouTube. 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! Playlist (Chapter 21) Ignition inputs, cam and crank

99 grand cherokee no start bad crank sensor
This is a shortened version of my diagnosis of the dead jeep. Another shop had looked at the jeep and moved the fuse to an empty fuse bay. I thought it was strange that shorting the 5 volt reference signal would knock out the communication to the scanner.

How to test for a bad crank sensor
In this video ill show a trick I have learned on how to test for bad sensors. Hope yall enjoy

Crank Sensor Quick Fix
GET SOFTWARE HERE: Crank Sensor Quick-Fix There are two types of crank sensors, and two types of tests, the 2 and 3 wire sensors. Here are the flash points for the crank sensor testing. 1) The 2 wire crank sensor generates a voltage, and is quick tested with a test light. 2) To test the two wire sensor, disconnect the crank sensor, ignition key on, hook the test light to battery power, and tap at each crank sensor terminal repeatedly. A spark click and injector pulse should be seen. 3) The 3 wire sensor has its own circuit, with 5 to 8 volt power, ground, and signal wires. Identify the signal wire using volt meter or diagram. 4) Take the test light and connect to battery ground. With key on, disconnect crank sensor, and repeatedly tap on the signal wire. You should hear a spark click and injector noid pulse. These are to test the ECM crank sensor circuit response. On both tests, you should see a spark click and injector pulse. Crank sensor is the main input to the ECM. If ECM working, then the crank is the only other issue. There are other ways to test, but involve an oscilloscope and more complex. This concludes the cranks sensor Quick-Fix.