So my 2000 Blazer has turned into a parts cannon, I've done just about everything under the sun to get it running correctly. I've changed out the MAF, MAP, IAC, TPS, CKP, all O2, distributor (aluminum), plugs and wires, spider and regulator, upper and lower intake gaskets, timing chain, sprockets, tc cover and I currently have a MAP connector on the way.
Here is the live data and the DTCs (P0108 and P1106) that are showing.
Any help is greatly appreciated.

Also when I probe the coolant temp sensor connector and the ground shows as it should, but the positive is showing a ground is well. Is this correct or it he wiring shorted?

The EGR is not showing a duty cycle as well, 0%.

 

Crap, sorry about the inaccurate live data, I'll update it soon.

 

See attached for starters

 

Here is the complete data

 

Thanks Les!

 

Your MAP voltage is 4.59V with engine running. This is above the 4.44V threshhold where P0108 sets and would indicate to the PCM as an abnormal condition. Bottom line, the MAP sensor output operates within the range of somewhere between 1.0V to 4.44V.

To do a quick check, display the MAP voltage as a live data feed (forget doing Autel Diagnosis pages) and learn to check live MAP voltage with engine running vs not running (Key on). If problem is indicated then go back through the trouble charts from the very beginning and go in sequence. (in addition to MAP sensor this also checks tps, wiring, PCM, etc)

 

Les is giving you excellent guidance and resources so I won’t step on his good work but I offer the following:

it’s very common for the shade tree mechanic to replace parts because that’s pretty easy in most cases and requires no diagnosis but is often not the issue even if a code says it involves the circuit containing that sensor. Especially in older vehicles it is often the wiring, voltages or ground which requires some diagnosis to make a final determination. It’s the whole circuit under suspicion not just the sensor. Approach the suspected circuit, analyze its overall function and if it’s all working correctly, leave that excellent OEM AC Delco part in there and move on to the next highest suspect. All good mechanics operate this way. Go watch some South Main Auto videos to see this in action. Good luck.


George

 

Lol, I watch South Main videos on YouBloob all the time. That guy is legit, I wish I had half the diag equipment he does. I've cleaned all the grounds I could find, i forgot to mention the PCM was replaced as well, a reman from FS1. The GM dealers wants an arm and a leg for a replacement. I plan on going through the troubleshooting that Les suggested this weekend. Will update you all afterwards.

 

"trynostics". LOL

George

 

That will come in handy for me too. Thanks for the PDF. This is the most convenient format for me because it's easy to edit if necessary. I use https://pdfguru.com/ Online PDF Editor & Converter for this, as it has many features, including the ability to annotate, merge, and split, which is very useful, especially when working with PDF manuals.