thunderstruck507

iTrader: (18)

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?

loweredd

iTrader: (2)

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.

thunderstruck507

iTrader: (18)

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.

loweredd

iTrader: (2)

I think those will do it for you.

thunderstruck507

iTrader: (18)

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

ryanvv355

iTrader: (17)

DLC pin 16 should have constant battery power, did you ground both 4 &5 in the DLC? maybe a bad ground under the dash?

thunderstruck507

iTrader: (18)

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

ryanvv355

iTrader: (17)

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.

thunderstruck507

iTrader: (18)

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.

thunderstruck507

iTrader: (18)

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?

loweredd

iTrader: (2)

thunderstruck507, I think it stops the injectors from injecting.

thunderstruck507

iTrader: (18)

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

bczee

iTrader: (12)

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..

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.

ryanvv355

iTrader: (17)

4 is a chassis ground, 5 is a signal ground. it may be a good idea to ground 5 right to the engine block??

LS1MCSS

iTrader: (18)

If the two wires are soldered together and grounded good, it will work fine that way.

thunderstruck507

iTrader: (18)

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?

95 bright teal

The vats shuts down the injectors and starter, so if that was the problem you would still get accessory power, just no start.