I'm really not sure how to decipher these things. Are you referring to the Numeric code after the dates? Are all of them trouble codes?

also yes, I see numbers in the grids.

 

In your log (csv) file, the engine is not running. Make a new log file with the engine running. While it really isn't necessary to have it running to see trouble codes, it must be running to generate new codes. The engine log file does not contain any information about some transmission trouble codes and they may cause the SES lamp to light (some do, and others don't). Obviously the engine scan button was on in order to make the log file you posted, but it won't be obvious if the transmision button was on also. When you make a new log file, make sure both engine and transmission buttons are green (on).

The engine trouble codes would be in the very last entry of each line in the log file if there are any, but some transmission codes may not be there unless the transmission scan section is selected also. In your first file, the entries all show "---" which means no engine codes.

This is how this pcm works regarding the scans for trouble codes: There is a scan section (button) for engine and one for transmission. The engine section reports all engine trouble codes and several transmission trouble codes. The transmission section reports all transmission codes and a few engine codes. So there is some overlap of the two. To be sure you are seeing all trouble codes, you have to select both the engine section and the transmission section.

 

http://www.mediafire.com/view/y7y4jz...P1S2186904.csv

Here's my latest one, I made sure that both options were selected, trans and engine. But, it seems to look pretty much the same, how long should I have to scan? For some background on this car, it has 40k miles on it, and has sat in a garage for the most part of its life because my aunt didn't bother fixing it shortly after she almost bought it new. There are tons of new parts on it, she just gave up, the usual throwing money at it. The car wont start, it sputters at the end of cranking some.

 

Ok, now I understand the situation. The scanning will not help very much at this stage since the engine doesn't run. You are seeing the SES lamp because the engine is not starting yet. The SES lamp remains on until it starts in any case (codes or no codes present). All I can say is that the data does not show anything unusual with the engine sensors at this point. All the numbers look normal for an engine that has not started yet. The one thing it does tell me is that the fuel is enabled ok, in that the anti-theft security system is normal and is not locking out the fuel delivery. That does not mean there is actual fuel flowing however. The battery reading is a bit low (11.5v) if the engine was not cranking. If it was cranking, it may be ok.

If either log was being done while the egnine was cranking, there should have been some rpm indicaction other that "50" (actaully zero rpm). If you don't see anything but "50" there while cranking, the distributor may not be working.

This is not a scan issue at this stage. You should start a new topic describing your non-start problem.

 

Alright, thanks for the help.

 

Re-read my last post which was edited to add the distributor reference.

 

That's some great info, so would you call that an Opti check or not? So just run the scan, then crank and see if there's an rpm spike?

 

I have never had an LT1 car at my displosal to check these things so I am slightly guessing. For some reason, the PCM sends an rpm value of "50" when the engine is stopped. That is represented by a data value of "1". I don't know why it does that, perhaps to signify that something is returned that is not a "0"? Most automotive specs I have seen indicate a typical cranking range of 200-300 engine rpm. The signal for the pcm determining the rpm is one of the outputs from the Opti-spark distributor. That one must be working correctly for the engine to run. I strongly suspect that even if the engine is not yet running, the correct rpm would be indicated by the scanner and be something way over "50" if that output is functional.

It would be helpful if someone with a working car could test this assumption by removing the fuel pump relay to prevent starting and cranking the engine while scanning. Any takers, anyone?

 

Alright, when I get back to the car I'll test it out just to see if I get anything back. If it worked that would be a really simple way to check an opti.

 

Here is the link to my data log:

http://www.mediafire.com/view/h03gk1...P3S2129782.csv

Thanks in advanced for the review.

 

Appears to be the same log you posted in the other thread. Let's leave all the comments there rather than cluttering up Gary's thread with data log and responses.

https://www.camaroz28.com/forums/com...9/#post6959100

 

Thanks Fred. I was going nuts trying to figure where I saw that file before ;-)

 

First off, I wanted to say thank you for such a great program! It is perfect for knowing EXACTLY how the motor is running..

Second, I was scanning the car and under the "Electrical Faults" tab saw "Performance Lamp Open" active. What does this option show/what does it mean?? Im trying to familiarize myself with all the ins and outs of the program and just didnt know what that meant.

Thanks in advance!

 

I am no expert on the Camaro or the Performance light, since I don't even have one on my Trans Am. I guess it means that the light bulb is burnt out or the socket is bad, or maybe it isn't even installed on your car. I just report what data the pcm is sending and how that correlates with a Tech II scan tool.

To clarify a bit, Open means that the electrical circuit is broken and no current is flowing. Shorted means that way too much current is flowing. In either case, the pcm may just shut off the drive for that circuit in order to prevent damage to itself.

 

"I have never had an LT1 car at my displosal to check these things so I am slightly guessing. For some reason, the PCM sends an rpm value of "50" when the engine is stopped. That is represented by a data value of "1". I don't know why it does that, perhaps to signify that something is returned that is not a "0"? Most automotive specs I have seen indicate a typical cranking range of 200-300 engine rpm. The signal for the pcm determining the rpm is one of the outputs from the Opti-spark distributor. That one must be working correctly for the engine to run. I strongly suspect that even if the engine is not yet running, the correct rpm would be indicated by the scanner and be something way over "50" if that output is functional."

With Freescan it also shows 50 rpm but when it starts cranking (bat volt drop) it will show 75 to 250 as the injector priming fuel delivery begins then >600 rpm when all cylinders fire.

btw, I tried to download your pgm, but many ports from different sources are opened up (~20) on my computer when I try. I go to the "Scan94/95-LT1-V8 folder" but there are no files there, just 3 directories. Do I have to join mediafire to get this file???