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Double checks on wiring before giving it power?

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Old Sep 28, 2008 | 08:13 PM
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Default Double checks on wiring before giving it power?

About to put the battery in and see if the computer is good or not.

I have the 4 red wires connected to 12 volt each fused, 2 to switched each fused, and ground. OBII port wired to switched, ecm, and ground under the dash.

Any must check things before I connect the fuse block to power?
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Old Sep 28, 2008 | 09:24 PM
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Fire extinguisher handy.

LOL.


I did mine the other night to check the airride for leaks. . No problems. It felt good to have no smoke coming out from anything. I didn't turn the engine over, cause it's not ready to crank.


Just go for it man....if your not 100% sure, just imagine the rush you'll get. LOL.
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Old Sep 28, 2008 | 09:45 PM
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well I plugged it in any nothing blew up, but when connected to a snap on diagnostic tool, it gets a "no communication" error

also the port is only getting power with the key on

does anyone have any ideas on where to check first?

EDIT: I did just remember the 3 grounds behind the drivers side head are not hooked up if that could be it.

Last edited by thunderstruck507; Sep 28, 2008 at 09:55 PM.
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Old Sep 28, 2008 | 10:15 PM
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I think those will do it for you.
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Old Sep 28, 2008 | 10:35 PM
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well i stripped them real quick and used a jumper to jump from them to the engine and no go still

I'm gonna go try jumping to the battery post and take some pics of the radiator hose as reqested by a member
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Old Sep 28, 2008 | 10:42 PM
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DLC pin 16 should have constant battery power, did you ground both 4 &5 in the DLC? maybe a bad ground under the dash?
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Old Sep 28, 2008 | 10:45 PM
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oh shoot, i forgot there are supposed to be 2 wires to ground under there, I only have 1 so far *slaps head*

and its wired to switched not constant, so maybe that has something to do with it
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Old Sep 28, 2008 | 10:48 PM
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The constant deal is only for the scanners so you can run them with the key off, i dont think it is your problem, but should be addressed.
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Old Sep 28, 2008 | 10:56 PM
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Yeah, first thing tomorrow I'm going to hook it up to constant.

The ground issue has to be it. I remember now there were supposed to be 2, just got in a hurry again. That should get things working I hope. Oh btw, I'm not trying to start it, I'm just seeing if the computer will communicate to make sure its good since it was bought used.

Thanks guys, I'll give an update in the morning.
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Old Sep 29, 2008 | 10:42 AM
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after giving it a look, the 2 grounds were wired together then for the length I needed I had used a larger gauge wire so that they both shared a ground location

aside from the port getting switched power instead of constant does anyone have ideas?

how does the VATS system work? does it just shut the computer off after several seconds if the signal is not received?
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Old Sep 29, 2008 | 11:00 AM
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thunderstruck507, I think it stops the injectors from injecting.
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Old Sep 29, 2008 | 11:28 AM
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thanks

I hooked up only ecm power and ecm ground, and I get power to the odbII port but it just gives me "no communication" error

should I be getting anything with just that? I'm about to just go about hooking up fuel and all the other stuff and just see if it will turn over or maybe start and run before the VATS kill it
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Old Sep 29, 2008 | 01:14 PM
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Originally Posted by thunderstruck507
OBII port wired to switched,

Isn't the ODBII DLC connector, pin 16 (orange) a constant +12v (battery) ?.. Pin #2 on the DLC should be running to the PCM (purple for the serial data line).

Maybe your corrected it now..
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Old Sep 29, 2008 | 01:32 PM
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Originally Posted by thunderstruck507
after giving it a look, the 2 grounds were wired together then for the length I needed I had used a larger gauge wire so that they both shared a ground location

aside from the port getting switched power instead of constant does anyone have ideas?

how does the VATS system work? does it just shut the computer off after several seconds if the signal is not received?
I have read in previous posts that the 2 grounds need to be separate. I don't know why, but some have had luck with them grounded to the same spot, and others had to ground them separately.
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Old Sep 29, 2008 | 01:50 PM
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4 is a chassis ground, 5 is a signal ground. it may be a good idea to ground 5 right to the engine block??
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Old Sep 29, 2008 | 01:52 PM
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Originally Posted by GlennNo50
I have read in previous posts that the 2 grounds need to be separate. I don't know why, but some have had luck with them grounded to the same spot, and others had to ground them separately.
If the two wires are soldered together and grounded good, it will work fine that way.
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Old Sep 29, 2008 | 02:04 PM
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thanks guys, it looks like I only have 1 power wire to the ecm hooked up

its an orange wire in the camaro body plug

where is the other one that gets constant?

also I have 3 grounds on the back of a head, where is number 4 supposed to be?
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Old Sep 29, 2008 | 10:22 PM
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The vats shuts down the injectors and starter, so if that was the problem you would still get accessory power, just no start.
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