Hey, I didn't realize I had so many responses, I guess I missed the notifications but non the less all good input and I will take into consideration as I continue to trouble this issue.
With all that aside, today was the first day that the issue arose since the last time that posted and wanted to respond to blindsquirrel's suggested tests.
1. I was not unable to capture voltage readings by pack probing at the moment that it failed as it takes quite some time before failure and I'm daily driving putting about 60 miles a day on it. On top of that, I don't have a DVM with any kind of recording capacity, if necessary to isolate this issue, I will find a way though.
2. With that said, I was able to back probe the ECM and read voltages with the vehicle currently experiencing the ECT related issues as well as capture some other info using the GTO's build in special menu AND Scanner readings. Here are my current findings..
a. As before, gauge is at "COLD" level, vehicle is hard starting when hot (sometimes require full pedal).
b. GTO special menu access in cluster - Coolant Temp = 419*
c. Scanner - ECT (SAE) reads normal operating temperature when key on and run. When ECT is unplugged it reads -40 which I believe is normal.
d. Scanner - ECT (??) key on can ready anywhere from 68* to 181* from what I have seen , engine running is about 198 but not smooth and not consistant with ECT (SAE) so not sure where this value is coming from(see scan below)
e. Voltages, ECT sensor plugged in and back probed at ECM - GB wire (pin 52) 4.1 vdc / Y wire (pin 55) 2.634 vdc
f. Voltages, ECT sensor unplugged and back probed at ECM - GB wire (pin 52) 4.1 vdc/ Y wire (pin 55) 5.04 vdc
g. Ohm reading across ECT sensor seems normal with a steady drop in value as engine slowly cools off.
Now I haven't done it yet, but I can guarantee that simply uploading my last tune will temporarily fix this problem, not sure how that is, I just know it has worked every time previously.
UPDATE: I don't have to reflash ECM , I just tried disconnecting the battery for 30 seconds and all seems to be working as normal again.
Also, I was mistake about the fans when this issues arises - the seem to be working as normal.
Thanks again
-Steve
Ect Troubleshoot.Layout.xml
ECT Troubleshoot.hpl
Adding responses to other posts:
Originally Posted by
5ft24
The GTO's have a very common issue with the harness behind the glove box rubbing and chaffing and causing all kinds of weird issues. I would check that before dropping the cash for a BCM or PIM
I did look into this as I researched and found many complaints related to this online. I was unable to see any damage to any sheathing or wires going to the BCM after pulling out my glove box to inspect. I actually pulled BCM out to get a good look.
Originally Posted by
WOODS83X
Just had this same problem with my 06 trailblazer as with e40. It turned out to be the wire broke about a 1/8 inch from the plug. Pulled on each wire a little and one stretched letting me know it was broke inside making contact sometimes. Hope this may help.
I actually considered this as I did break this sensor installing my headers and replaced with a new one so its likely. Did your broken wire cause the same issues I am experiencing, it just seems unlikely that an intermittent open in that circuit would cause these issues until a reflash of the ECM but that's just me thinking outloud.
Originally Posted by
blindsquirrel
If you can fight your way through the TIS2000 software install and get it working, you'll be able to program your own BCMs matched to your VIN with your MDI clone thing.
I'm sure I can fumble around until I figure it out - its just been sitting in the box so I guess I'll get it out and load the latest firmware in it and start checking it out as I search for a BCM. I take it, that I would have to get a new BCM?