Fried PCM?
Thread Starter
Teching In
Joined: Dec 2015
Posts: 23
Likes: 1
Fried PCM? I just had a sudden issue with my ls swapped 73 Camaro. I did a t56 swap and I drove it an hour without issues.Then I try to go to the liquor store and it dies 5 feet from my driveway. Eventually, I found that the pcm wasn't getting any power. I hooked up 12v fused hot wire and my fuel pump primed and it started up. So I try it again, and it pops the fuse. I toss in a new fuse and nothing, the fuse didn't even pop. I check the voltage and its getting power to the pcm. Did I fry the pcm? And I have a dyno tune on that pcm, would the tune transfer from a fried pcm to a new pcm?
Pretty confused here, any help is greatly appreciated!
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Pretty confused here, any help is greatly appreciated!
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If you were able to bypass the relay and hotwire the fuel pump, but the motor still fired up you didn't fry the PCM. I'd start tracing the wiring from the fuel pump relay. Maybe an exposed wire rubbing the frame or something.
TECH Fanatic
Joined: Feb 2015
Posts: 1,080
Likes: 178
Need more info:
Which PCM?
Can you connect scan tool to OBD port and scan for codes, read live data, etc? If so, that's a good sign.
What happened to the original 12V supply to the PCM?
Where was the 12V supply coming from?
When you hotwired PCM, did you remove or cut the previous supply wire or did you spice into wire and back feed that circuit too?
Did you possibly connect hotwire to a non B+ pin/wire to PCM?
I'd recommend check all power and grounds to PCM. If all good, scan tool should connect and allow you to see/better understand what's going on.
Hope this makes sense.
Which PCM?
Can you connect scan tool to OBD port and scan for codes, read live data, etc? If so, that's a good sign.
What happened to the original 12V supply to the PCM?
Where was the 12V supply coming from?
When you hotwired PCM, did you remove or cut the previous supply wire or did you spice into wire and back feed that circuit too?
Did you possibly connect hotwire to a non B+ pin/wire to PCM?
I'd recommend check all power and grounds to PCM. If all good, scan tool should connect and allow you to see/better understand what's going on.
Hope this makes sense.
TECH Fanatic
Joined: Dec 2017
Posts: 1,468
Likes: 265
From: Bossier City, Louisiana
And when you get all of this sorted out, make a copy of your tune or ask your tuner person to send you a file copy of it. Think of it as an insurance policy for situations like this. Make certain that you get your tuner person to send you a copy of your tune that is not "tuner locked".
Rick
Rick
