CRO simply plugged into DLC Pin 2 and ground.  Reving engine to keep bus busy for photo.
<br>V/div = 1  ms/div = .1<br>
<img src="DCP_0001.JPG"><br><br>

Halved timescale for better view of waveform
<br>V/div = 1  ms/div = .05<br>
<img src="DCP_0002.JPG"><br><br>

Doubled voltage scale for brighter rising and falling edges
<br>V/div = 2  ms/div = .05<br>
<img src="DCP_0003.JPG"><br><br>

Using ELM scan to keep bus busy (lots of queries and answers)
<br>V/div = 1  ms/div = .05<br>
<img src="DCP_0005.JPG"><br><br>

I thought I had enough images, so I turned off the car, but noticed that with just the ELM scan querying the waveforms were obviously different
<br>V/div = 1  ms/div = .05<br>
<img src="DCP_0006.JPG"><br><br>

Car Back on again
<br>V/div = 1  ms/div = .05<br>
<img src="DCP_0007.JPG"><br><br>

Elm Scan only
<br>V/div = 1  ms/div = .05<br>
<img src="DCP_0008.JPG"><br><br>

Halved the voltage scale and centred, still can't see any rising edges
<br>V/div = 2  ms/div = .05<br>
<img src="DCP_0009.JPG"><br><br>

Played with the trigger hold-off, and managed to catch repeating part of request
<br>V/div = 2  ms/div = .1<br>
<img src="DCP_0010.JPG"><br><br>

Started the car again with new triggering, seem to be seeing start of request overlayed with start of reply.
<br>V/div = 2  ms/div = .1<br>
<img src="DCP_0011.JPG"><br><br>