Frequency test gm MAF

I’m trying to get a reading off of a MAF on a 2006 Chevy Silverado. I’ve tried sensor ground and battery ground. Sensor ground is a little cleaner. I can’t get a nice smooth reading. All the way through it I have these spikes that spike well above 50 kHz. I’m not sure what’s going on. Am I picking up interference ? I get the same thing on my 6.7 ram.



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Here is a pic.


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whats scan data say? same thing vs scope?

Scan data is normal. Can only get 7000hz on a snap throttle. Code P0101 comes up intermittently.


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So you are getting 50khz spikes, even on your dodge?

i think i see your problem. It looks like you have peak detect on. when i first did this test i had peak detect turned on and experienced the same issue. im pretty sure this when doing this test peak detect should be off. maybe some of the more experienced scope users can chime in.

Nevermind peak detect should be on its the filter i was confused about. Im mixing up the filter and using peak detect

did you try a shorter time base? 10 seconds might be a bit long to capture the detail you're looking for