LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Electrical plugs going through firewall

Old Mar 25, 2003 | 10:00 PM
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Electrical plugs going through firewall

I was able to get most of it figured out, but I have a couple questions on the plugs that go through the firewall next to the keyless entry box. I'm talking about the C230 and C220 plugs. (http://csce.uark.edu/~jgbertr/rb/C220h.jpg and http://csce.uark.edu/~jgbertr/rb/C230h.jpg) I'm doing a swap in an older vehicle, so I won't be using the theft deterrent module. On C230, what does position E do, give 12v to the fuel pump relay? Is G 12v when the ignition is on? What is H? I don't know what TCC is. I've found that the H wire goes to the PCM gray plug #15 which is the brake switch signal. Also I'm not sure how I should wire up J. Should it be grounded or something when its in park/neutral?

Also theres a couple other plugs going through the firewall grommet along with these. One is a black 4 position plug, with a very large purple wire that goes to the starter, a black w/ white stripe (I think) that is a ground, and another wire, where does this go? And theres another really small plug with three wires. I'll take some pictures and post them.

Thanks for your help..btw, shoebox where did you get those diagrams? Is that all of them?
Old Mar 25, 2003 | 10:47 PM
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Have you looked at this?

The 4 cavity plug might have a
ppl
yel
yel/blk
brn

It is supposed to go to the theft deterrent relay. If you are not doing all that, just use the purple to go from your ignition switch to the starter solenoid.
You may have to get the theft deterrent programmed out of the pcm if that is possible. The "E"wire is a pulse width modulated (PWM) ground from the theft deterrent module to allow injector operation.
"G" is hot with ignition ON.
TCC is torque converter clutch. "H" normally would have 12v on it with key ON, until the brake is depressed (then goes open) to release the TCC.
"J" would be grounded when in park or neutral.


Diagrams are from the factory manual.
Old Mar 25, 2003 | 11:08 PM
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Old Mar 25, 2003 | 11:25 PM
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Ok, on C230 wire E for the pulse width, do you know what I should do with it if I don't have the theft deterrent module? I also posted links above to the other couple plugs I'm not sure about. I don't think some of them go to the computer which is making it hard for me to find them. I found one I think that went to the coil.
Old Mar 26, 2003 | 12:12 AM
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Originally posted by kevmor99
Ok, on C230 wire E for the pulse width, do you know what I should do with it if I don't have the theft deterrent module? I also posted links above to the other couple plugs I'm not sure about. I don't think some of them go to the computer which is making it hard for me to find them. I found one I think that went to the coil.
I have no clue how you are going to fake a square wave signal on that wire. Maybe it can be programmed out like I said earlier.

Your pic2 are this and this.

The three conductor plug is to an a/c pressure switch if the wires are red, blk and grn.

I will try to look for the others later.
Old Mar 26, 2003 | 12:44 AM
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The 3 wire plug next to the 8 and 10 position plugs has a red w/ black strip, grey, and black wire. Thanks for the pictures of the others.
Old Mar 26, 2003 | 09:01 AM
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Originally posted by kevmor99
The 3 wire plug next to the 8 and 10 position plugs has a red w/ black strip, grey, and black wire. Thanks for the pictures of the others.
Sorry, yeah, those are the right colors for the a/c pressure switch.

The 3 wire connector on the inside with drk blu, blk, gry wires is the evaporator temperature probe connector.
Old Mar 26, 2003 | 11:30 AM
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Ok, I was just looking through some images on your website and I found the fuel pump prime connector, that is the one wire one next to the 8 and 10 cavity plugs and the a/c pressure switch. What does this do? I'm planning on hooking up the fuel pump/relay independently of the LT1 wiring harness/computer, and it should shut off when it reaches a certain pressure.
Old Mar 26, 2003 | 03:12 PM
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Originally posted by kevmor99
Ok, I was just looking through some images on your website and I found the fuel pump prime connector, that is the one wire one next to the 8 and 10 cavity plugs and the a/c pressure switch. What does this do? I'm planning on hooking up the fuel pump/relay independently of the LT1 wiring harness/computer, and it should shut off when it reaches a certain pressure.
The a/c pressure switch give feedback to the pcm for control of the compressor clutch. It is attached to one of the a/c pipes.
Old Mar 26, 2003 | 07:52 PM
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Sorry I meant the one wire plug that is the fuel pump prime connector (http://csce.uark.edu/~jgbertr/rb/fuel_pump_prime.jpg). Do I need this? Can I just have the fuel pump wired seperately?
Old Mar 26, 2003 | 09:35 PM
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Originally posted by kevmor99
Sorry I meant the one wire plug that is the fuel pump prime connector (http://csce.uark.edu/~jgbertr/rb/fuel_pump_prime.jpg). Do I need this? Can I just have the fuel pump wired seperately?
It is basically just for test purposes. You can eliminate it if you want.
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