Intermittent stall, no start - P0320, P1391 cam, crank sensor testing (Jeep)
Join me and one of my students at RTC as we troubleshoot an intermittent no start problem on a Jeep Grand Cherokee. The procedures shown in this video apply to all Chrysler, Dodge and Jeep electrical systems. In particular, the cam and crank sensor tests that we show. Symptoms - intermittent no start, no spark or injector pulse - check engine light on P0320, P1391 trouble codes - hesitation and surging Fix - replace faulty crank sensor Tests shown - how to test for cam and crank signals on scan data - what scan data Ignition Cycles can be used for - how to test the cam and crank sensors with a scope - how sample rate of a scope affects the signal - why a sensor ground is better to use than battery ground in some circumstances - how to recreate an intermittent problem - sensor power and ground tests Engine Performance Diagnostics chapter 21 Playlist - (Chapter 21) Ignition inputs, cam and crank sensors https://www.youtube.com/playlist?list=PLAFYVCyenqcqEN41aYznWn9Nfhy1PiMjo Related videos - Picoscope Basics Part 1 https://youtu.be/81AGbZcgCZs - Picoscope Basics Part 2 https://youtu.be/ntJJYhkmR4I - How to test a crank sensor (Chrysler Dodge Jeep) https://youtu.be/YtpDi2vnGog - Jeep 4.7 no start from faulty cam sensor (an SD Premium video) https://youtu.be/kRnq8uuUGOg - Faulty cam sensor setting a crank sensor code - P1389, P0320, P0622 https://youtu.be/VrsI1xCoZ8M 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 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!
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: http://www.autodiagnosticsandpublishing.com/Software_Catalog.html 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.
How to Test Crankshaft and Camshaft Position Sensors
Here is how you can easily test both your crankshaft position sensor and camshaft position sensor. It's very important to be able to test these sensor since because they control your ignition and fuel injector pulse and if they fail they could cause a Crank No start condition. Multimeter used in this Video: http://amzn.to/2aWpN8E Please consider supporting this channel: https://www.patreon.com/Ratchets Facebook: https://www.facebook.com/Ratchets2015 Twitter: https://twitter.com/Ratchets15 Instagram: https://www.instagram.com/ratchetsandwrenches Here are some other video's you may find interesting: How to diagnose a No Crank No Start Condition: https://youtu.be/2RUhq7sXNBo How to test a Mass Air Flow Sensor: https://youtu.be/a6eaOd3ihiE How to test Fuel Injectors: https://youtu.be/Sfq-fM3-TIk How to test a Throttle Position Sensor: https://youtu.be/9IUtl6J5F5s If this video helped you out please don't forget to subscribe, give it a thumbs up or if you are feeling generous leaving a tip by clicking the " i " button on the top right corner of the screen. Thank you very much for your support! Disclaimer: Due to factors beyond the control of Ratchetsand Wrenches, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. Ratchetsand Wrenches assumes no liability for any property or personal damage that may arise from doing a repair on your vehicle after watching any of my repair video's. Due to factors beyond the control of Ratchetsand Wrenches, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Again Any injury, damage or loss that may result from improper use of tools, equipment, or the information contained in this video is the sole responsibility of the user and not Ratchetsand Wrenches.