I had the opportunity to do some training at a shop that had a crank no start on a 2018 Nissan Versa.
This vehicle only had 9k on the clock but apparently was a salvage or something of that nature as the dealer would not warranty any repairs. It had a engine and new ECM installed per the dealers recommendation.
Our initial testing revealed cranking RPM on the scantool with no DTC’s stored. No spark or injector pulse present I decided to scope the Cam and Crank signals along with In Cylinder pressure just to see if anything obvious.
The above patterns had shown us a few things:
- The Cam and Crank sensors had proper powers and grounds.
- Compression was present, and the exhaust valve was opening near 150 degrees ATDC, which is good.
What we did not know was if the timing was correct. Luckily we had a known good vehicle of the same year make and model to get good pattern off of. Below you can see the totally different cam signals.
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