broke down 96
Thread Starter
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Tuned
Joined: May 2004
Posts: 289
Likes: 1
From: Walton, Ky
Okay so I just came in from doing some testing. I unplugged the pcm at the firewall and tested for grounds and power feeds. Pins 24,25,51,76,77,103 all tested as good grounds and pins 55,71,97 all have 12v's. I also tested pin 80 which according to the diagram I found d is wait to start output and it also has 12v which I'm not sure if it should being unplugged with the key off.
Thread Starter
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Tuned
Joined: May 2004
Posts: 289
Likes: 1
From: Walton, Ky
I also went back out and unplugged the fuel bowl heater, checked for power at the go relay. I have 12v at the red/green little wire while key is on. I pull fuse 22 and I still get .36v on the red/green wire. The way its looking to me the PCM is fried. Can anyone tell me if a 95 pcm would work in my 96? I have a 95 5 speed pcm and was wondering if I could test with it to see if it would start at least.
Post Fiend
Joined: Dec 2010
Posts: 10,121
Likes: 3
From: Orrville, Ohio
Agreed. I would definitely try it, I just wanted to be sure you didn't think it would be a direct swap and make the truck driveable.
Post Fiend
Joined: Dec 2010
Posts: 10,121
Likes: 3
From: Orrville, Ohio
It should do that much, though it may act funny at idle. I know an automatic PCM in a manual truck will make it romp on idle, but I don't know for sure what it will do the other way around. It should start and run though.
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Thread Starter
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Tuned
Joined: May 2004
Posts: 289
Likes: 1
From: Walton, Ky
Update I put the 5 speed 95 pcm in it and the wts light came on but my batteries were drained from messing with it. I hooked jumper cables to my Cummins and let it charge for 10 minutes. Cranked over for about 15 seconds and stumbled to life. It ran tough for a minute but is idleong fine now. Its been running for 15-20 minutes and I've shut it off and started it a few times. Looks like I need to find a new auto pcm.
