This is the data going back and forth between computers. So let me pause it and then I will make some measurements and we can see what we're talking about here when we're transmitting data.Īll of these little squares here, these are what they would call data packets. We're dealing with some really fast stuff here. So that'll give us a nice, good size window.Īnd then we have to set our time base down to 100 microseconds. Looking back to the lab scope, how it's set up, you can see both channels are set to 10 volt scale. And then pins four and five are also ground so you can see we have the ground plugged into pin four on this vehicle. This has got a short cord that plugs in to the DLC and it breaks out to a box that has 16 individual banana jacks and you can plug in to channel six and 14 if it's CAN network vehicle, because all CAN network vehicles, that's a standard they have to terminate on pins six and 14. So I'm going to go over here and show you how we can test it and how the pattern is supposed to look.Īs you can see here we have both our channels hooked up to a DLC breakout box. The only way you can test the CAN network is by using a lab scope. Diagnosing communication problems on a vehicle network can be a little bit of a challenge if you're not sure how to hook up or what you're really looking at.
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