Hello,
I have a 2004 Silverado with a Lm7 that I am trying to use my tuner to check DTC codes and Readiness monitors.
Unfortunately, the DTC screen never "connects" and I never see the same picture as in the help file. The gray box just stays blank and none of the readiness monitors have any comments after them.
I thought it was maybe something I did when I was changing the DTC codes in the tune ( i turned off the rear o2 sensors), so I checked on another truck I have. This one is a 2004 Suburban with a L59. The same occurs with it. I have not changed anything on the suburban, it is still on factory tune and the PCM is not unlocked on my tuner.
I am "connected" and i have tried to check the codes, and nothing. I then start "scanning" and check again, and nothing. I can use the VCM controls to turn the CEL on and manipulate the vehicle fine, as well as I can take logs of all the normal functions. The only thing that appears wrong is the DTC function.
What am I doing wrong? Is it something with 2004 trucks that prevent the DTC from working properly?
I attached a picture of what I see.
Sorry if this has been asked before or is easy, I tried reading the help file and searching for DTC related problems on the forums here, and had no luck.
-Chris