This Caravan case study covers scope testing camshaft and crankshaft sensor signals while diagnosing a timing misalignment code, a valuable skill for all makes and models. I also got the chance to introduce you to iATN, and how beneficial it can be as an information resource during diagnostics. The information I found there was a huge part of making a confident call on this vehicle.

Engine Performance Diagnostics chapter 21

symptoms 50

  • check engine light (P0032, P0344, P0016)
  • cutting out/surging off idle
  • intermittent long crank time

fix 50

  • replace camshaft sensor reluctor (part of the timing chain sprocket)

test shown enh 50

  • using scan data to evaluate a cam/crank timing issue
  • how to scope the cam and crank sensor signals
  • how to compare a cam/crank waveform to a known good
  • understanding changes in Chrysler cam/crank sensor reluctors
  • using injector and coil firing events on a lab scope

Tools used

  • scan tool
  • lab scope (Picoscope Automotive 4 channel kit)
  • 20:1 attenuator
  • iATN.net

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(Chapter 21) Ignition inputs, cam and crank sensors

Related videos:

Faulty cam sensor setting a crank sensor code - P1389, P0320, P0622:


Intermittent stall, no start - P0320, P1391 cam, crank sensor testing (Jeep):


Hall effect cam/crank sensor operation and testing Part 1 (a SD Premium video):


Jumped timing chain (no compression on 3 cylinders) - GM 3.6:


Jeep 4.0L timing problems (a ScannerDanner Premium video):


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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!