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All I have left to do before strating my truck is hook up these 7
wires from the PCM. The guy who built my wiring harness is
long gone. Please Help.
1. Purple w/ white stripe-- It says Tranny plug
2Yellow-- It says Tranny plug
3.Dark green-- It says Serial Data
4.Green w/ white stripe-- It says VSS Out 4k
5.Yellow-- It says Serial Data
6.Two Green wires-- It says B.U.
7.Yellow w/ Black stripe-- It says VSS out 128K
I don't have cruise.
I do have a elc. speed-O that I need to hook up.
Thanks for any help. Ive been waiting 3 weeks
just to hook up these wires.
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Break out the ohm meter and back trace which pin number and what color connector they go to in the PCM. What vehicle is this for? LS1? LT1? I didn't know there were two serial data lines in a LS1. One might be the MIL wire and the other would be a serial data line.
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#4 green with white stripe = vehicle speed sesnor 4K must mean 4000 pulses per mile, use that for the speedo.
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The harnes is out of a 2000 chevy 5.3l.
The guy who built the harnes labled the wires coming out
of the pcm. I guess he thought I would just now where
to hook them up. He was working for LNJ's for about 2yrs
doing only LT1/LS1 swaps.
Thanks GMCwantsLS1
Thats one out of the way.
I do not have my PCM tune yet. So I also have to figure
out how to hook up this VATs module he gave me.
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3. Dark green is probably the serial data for the obdII diag plug. I believe it's Number 2 on the obdII plug. Also, 4 and 5 need ground and 16 need battery, I'll check this again to be sure, but I just got done hooking one up and that should be it (from memory).
Like it was said, trace them back to the pcm connector and identify the pin #, then we'll know for sure!
btw, give me a call, forget the vats bypass,
allen
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I can't seem to match those colors with my wiring schematics. You will probally need to ohm out the wires to the pcm pin locations and then we could be more help. Sorry kinda slow on the responce looks like the other two gave a similer responce
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Thanks Guys
Ill trace them back to the PCM and post more.
Maybe Ill be abel to here this thing run after all.
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Hopefully your's sounds better than mine. Right now mine sounds like a top fuel dragster! Oh well, at least it runs and drives. :jump:
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Here we go, I got the #s and found one more wire.
1. Purple w/ white stripe-- It says Tranny plug
Goes away from PCM
2Yellow-- It says Tranny plug
Goes away fromPCM
3.Dark green-- It says Serial Data
#58 BLUE on PCM
4.Green w/ white stripe-- It says VSS Out 4k
#50 Red on PCM
5.Yellow-- It says Serial Data
#59 blue
6.Two Green wires-- It says B.U.
Goes away from PCM
7.Yellow w/ Black stripe-- It says VSS out 128K
#49 red8. Green ---it says S.
away from PCM
9.Gray--- It says S.V.
#48 Blue on PCM
10. 2 black/ black and white wires
I don't have cruise.
I do have a elc. speed-O that I need to hook
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VSS out to speedo
Purple and Yellow to speed pickup on tailshaft
black/black and white to ground
Dark green to serial data connector on OBDII connector, not OBDI
gray might be fuel pump relay ground
I am just guessing, trying to remember. Will confirm later. LUNCH TIME!! :laugh:
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#58 blue is typically green and it's the serial data line from the obd2 connector under the dash board.
#50 red is a green/wt vehicle speed sensor
#59 blue is not connected anywhere I have seen before
#49 Red is not used anywhere
#48 blue is MAP sensor 5V reference signal
Are you sure this is a truck harness from a 2000? The pinout above don't match a 2000 PCM in many spots for some reason. Did someone repin this thing?
go to this website for LS1 wiring harness diagrams and further information.
http://ls1tech.com/forums/showthread.php?t...002+pcm+pin+out
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Purple and the yellow wire are coming from the tail shaft of the tranny .
Where do I hook them up.
VSS out to speedo? The 4K right?
It may be 1999 wiring. Im just going by what I was told.
