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Username Post: Vehicle is not responding OBD1        (Topic#374692)
4dr 57 
"11th Year" Silver Supporting Member
Posts: 4836
4dr 57
Loc: Texas Hill Country
Reg: 11-10-04
03-13-24 04:12 PM - Post#2867920    

The subject is a 97 GM Lt1 engine in a 57 Chevy that's set up as 95. We put about 10-12k enjoyable miles on her when life took over in 2019 after halting the upgrades I was prepping for.
At that time there was a spark maybe from the Alt to Batt cable..not exactly sure, and the last time i looked the scan tool said "Ignition."z(I checked fuses but no tests. that is where all work stopped.

Fast forward to today. All is back together. Tried to scan the system because in the past a friend did some welding on her and I forgot to disconnect the batt. which led to replacing the Ignition Module. Figuring it was probably the same thing I
tried to scan the system to check but all I got was "vehicle is not responding" after checking the scan tool batteries, removing some green buildup in the Scan Tool's battery compartment, and checking connections and battery's, it stil read the same, "vehicle is not responding.

I turned the engine over long enough w/o the fuel pump activated to turn off the oil light, plugged the fuel fuse back in but all that happened was the motor spinning. Lights, fans, all working.

I have a new ignition module but at $150 I wanted to scan the system first, but it does not look like that's going to happen. :sad :
What should I do next? Thanks








It's all good. Mostly


 


Shepherd 
Valued Contributor
Posts: 3337

Loc: Lake George, NY
Reg: 11-11-15
03-13-24 06:44 PM - Post#2867923    
    In response to 4dr 57

Some 95 vehicles were actually obd 1.5, a precursor to obd11. Early obd systems used the body feed fuse to power the scanner and access data. Is your scanner capable of accessing that transition year system?



 
4dr 57 
"11th Year" Silver Supporting Member
Posts: 4836
4dr 57
Loc: Texas Hill Country
Reg: 11-10-04
03-14-24 07:23 AM - Post#2867937    
    In response to Shepherd

Hi Sheperd,
I have no idea actually or even where to begin a search as the screen won't go past the aforementioned response, unless there's some kind of work around.
The Computer was programed by S&P of Mena, Arkansas fame. I would think it's a rather strightforward OBD 1 program. Options yes, such as what to turn on/off, gear ratios in the trans and final drive, a/c,fuel canister, the tune itself such as race, street, ECO, etc, but nothing related to future tuning as it was deliberately set to run OBD 1 as is as far as I know.
Thank You



It's all good. Mostly


 
Shepherd 
Valued Contributor
Posts: 3337

Loc: Lake George, NY
Reg: 11-11-15
03-14-24 10:09 AM - Post#2867942    
    In response to 4dr 57

You need to check with those people and see if your scanner is compatible with their pcm mods, and ask why you cannot access data. You may have fried something in the ecu/pcm when you had wiring issues.



 
4dr 57 
"11th Year" Silver Supporting Member
Posts: 4836
4dr 57
Loc: Texas Hill Country
Reg: 11-10-04
03-14-24 05:56 PM - Post#2867957    
    In response to Shepherd

The scan tool works just fine with this setup.
S&P is gone
yike! i'll learn how to test the ignition module first, as i can not scan the system. If it's ok, then I may have to think about being in the same situation as yesterday and today.
Thanks for the boost Sheperd1




It's all good. Mostly


 
john42 
Member
Posts: 120
john42
Loc: Rockdale Texas
Reg: 12-31-03
03-15-24 05:35 PM - Post#2867982    
    In response to 4dr 57

Not an expert but, I would verify power to the ecu first. You said the fans are working, are they controlled by the ecu or separate circuit? If by the ecu then it has power. Note, I also have a S&P system an have no support either. I remember cautions about electrical arcs and welding with the battery connected. Hope you find the problem.



 
4dr 57 
"11th Year" Silver Supporting Member
Posts: 4836
4dr 57
Loc: Texas Hill Country
Reg: 11-10-04
03-19-24 04:26 PM - Post#2868133    
    In response to john42

  • john42 Said:
Not an expert but, I would verify power to the ecu first. You said the fans are working, are they controlled by the ecu or separate circuit? If by the ecu then it has power. Note, I also have a S&P system an have no support either. I remember cautions about electrical arcs and welding with the battery connected. Hope you find the problem.




Hi John42 Thanks!
It's my bad, fans are NOT working which is sad as you say, they are a signal that the ECU is getting power.
According to the S&P instructions and my interpation, there are a couple of sources of power at the fusebox, like fuse 4 and possibly one or both of the relays at the bottom of the AAW fuse box.
My CEL quite working too however the reason is the brown wire came out of the fusebox somehow (big hands) and I cannot access it w/o removing the front seat, due to my age. I can ask a guy however, so maybe.

This really saws me off as I spent a lot of time during the build ensuring I would not have to do anything like this because of an overlooked joint I didn't solder or something. It has worked flawlessly..but that one darn misstep with the ground wire.




It's all good. Mostly


 
Roauto 
Newbie
Posts: 2

Age: 65
Loc: NY
Reg: 04-05-24
04-08-24 01:11 PM - Post#2868704    
    In response to 4dr 57

Hay 4dr If the CEL is not on then there is no power to the PCM. That light needs to be lit with key on,engine off. Fuse #5 in the under hood fuse box powers the PCM. The PCM ground should be on the front of the left cylinder head. Good luck



 


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