P0344
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Joined: Feb 2009
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From: Plankinton, SD
P0344
Hey all, been a long time. I'm at a loss. I'm getting a 0344 code, truck runs for 10-15 seconds, quits. I've changed the cps, the plug to it, wires have been changed about half way up from the sensor. I ohmed the wiring from the 42 pin plug to just before the cps plug, all seems fine. I thought I had a problem where the brown/white wire splices into 3 wires in the harness, fixed all that, nothing changes. All I can guess is there is still a wiring issue, but I don't know how to find it. I'm just about to the point of taking it to my local mechanic (he has 2 7.3 trucks) and having him put new pins and wires from the 42 pin plug to the cps. I don't have a way to change the pins in the plug.
Any other thoughts? I pulled the chip and tried too.
Any other thoughts? I pulled the chip and tried too.
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Joined: Feb 2009
Posts: 10,410
Likes: 77
From: Plankinton, SD
They are racing, I'm not. I didn't want to go because of that reason. My job is pretty dependent on me, and I'm also getting married next spring. Next year. Besides that I don't have my new motor built yet, waiting on parts. 511 cubic inch 427 based FE with 2-4bbls. 😁
Electrical is not my strong point either.
Electrical is not my strong point either.
Lead Driver
Joined: Sep 2002
Posts: 9,550
Likes: 2,034
From: North Texas
Luckily for you, I like troubleshooting wiring problems.
So does the tach not move even? Fully tighten the 42 pin? Clean it all with Deoxit too. Remember, I had a redacted pin on my PCM, this would pop my A/C fuse when I would turn the A/C on all the time. Switched 12V hitting a ground pops a fuse every time! Might be just that simple.
LB runs to Pin 65 on PCM
DG runs to Pin 49 on PCM
Both of those aforementioned run to C138 aka 42 pin connector, not a biggie and probably not the issue.
BR/W runs to a Splice, S132, then to C138 and to Pin 90 on PCM it seems before S163 in there too. Quite convoluted on that circuit. My guess is that is where the issue potentially lies as most other sensors have that wire in common...such as the IPR.
So does the tach not move even? Fully tighten the 42 pin? Clean it all with Deoxit too. Remember, I had a redacted pin on my PCM, this would pop my A/C fuse when I would turn the A/C on all the time. Switched 12V hitting a ground pops a fuse every time! Might be just that simple.
LB runs to Pin 65 on PCM
DG runs to Pin 49 on PCM
Both of those aforementioned run to C138 aka 42 pin connector, not a biggie and probably not the issue.
BR/W runs to a Splice, S132, then to C138 and to Pin 90 on PCM it seems before S163 in there too. Quite convoluted on that circuit. My guess is that is where the issue potentially lies as most other sensors have that wire in common...such as the IPR.
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Joined: Feb 2009
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From: Plankinton, SD
Thanks man. Some of that is kind of hard to figure out for a guy not real good at electrical, but I'm gonna give it a shot this weekend.
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Lead Driver
Joined: Sep 2002
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From: North Texas
I am in Houston working for a week approximately, so no EVTM handy now. But I can help with what I can mobile.
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Joined: Feb 2009
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From: Plankinton, SD
One of the first times I've said this but I give up. I ohmed the wires between the pcm and 42 pin connector, they are fine. Swapped PCM, no change. Just like someone turned the key off, so I thought maybe my battery kill switch was possibly bad. Bypassed it, still nothing. I'm taking it in this week to get looked at by someone smarter than me on wiring.
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Joined: Feb 2009
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From: Plankinton, SD
Well, just thought I'd let you know what's going on. Figured out the cam gear is walking on the cam, eating cps's. Solution is to weld the gear on the cam. I guess it's not uncommon on higher hp builds. So, motor will be coming out again this winter. Sucks, but is what it is.
