2016 Honda Civic stalls and won't restart with abnormal crank

Ryan Mechanic Middle Village, New York Posted   Latest  
Question
Driveability
2016 Honda Civic EX 2.0L (K20C2) (JDJC)—19XFC2F82GE093776
Crank / No Start
Start-Stalling
Stall

i have this lovely honda and it will run fine for approximatley one minute and then stall. After the stall it wont restart with an abnormal crank. These are the scope patterns i took (green is ckp, red is cmp,blue is #1 injector and yellow is #1 ignition pulse). No matter what i try i cant seem to get clear wave forms from it and also dont understand the large voltage spikes when the car is about to stall. Any insight into this would be appreciated. I also have attatched all trouble codes found after replacing the tcm as per a tsb that was found.

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Ray Diagnostician
North York, Ontario
Ray Default
 

I don't know the Snap On scope, but it looks like the Sample Rate is set too low? Where are the scope lead ground connections? If the connections are on the battery negative terminal, is there corrosion on the battery terminal? When graphing the scan data PIDS, such as the RPM, do you lose communication when stalling or when cranking? Can you set the scope to a high Sample Rate and scope the…

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Ryan Mechanic
Middle Village, New York
Ryan Default
   

Thanks for the reply, if i scope the can line at the dlc, how would i know which module is causing the erratic signal? I also do not loose communication at anytime. I just scoped the can lines and do not get a clean square wave

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Justin Mobile Technician
Herriman, Utah
Justin Default
 

When using the Snapon scope you need to capture with a small time base and then out to see what you captured. Basically the reverse of the way Pico works. You don’t up the sample rate. the sample rate is for the screen time. So the smaller window of time will accomplish the same thing as increasing the sample rate.

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Ryan Mechanic
Middle Village, New York
Ryan Default
   

is this better?

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Ray Diagnostician
North York, Ontario
Ray Default
 

Practice getting nice, clean cmp, ckp, injector, CAN signals from a known good vehicle, to compare the good signals, to your problem vehicle's signals.

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Matt Technical Support Specialist
Dallas, Texas
Matt Default
 

Can you post the snapon file? snapon​.​com/diagnostics/us…

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Daryll Diagnostician
Seymour, Tennessee
Daryll Default
 

I would suggest setting the time scale to 50 or 100 ms and turn Peak Detect on. Rescale your channels also

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Bob Owner/Technician
East Longmeadow, Massachusetts
Bob Default
 

It looks like when the stall occurs all the signal noise disappears. I would suggest checking the level of alternator ripple voltage. I would want to rule that in or out first.

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