Splicing in a main engine wire harness at the firewall, need wiring diagram?

Tiny
JACOBANDNICKOLAS
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Hi,

The only thing I can think of is if an oil cooler on the engine (if it has one) cracked or something on the engine.

Do me a favor. I'm interested in solving this, but I need you to start a new thread. We try to keep the posts specific to one topic, so it is more helpful to others. I hope you understand.

Here is the link to start a new post. Just copy and paste your new question and we'll get to it.

https://www.2carpros.com/questions/new

Again, I hope you understand.

Take care,

Joe
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Saturday, April 22nd, 2023 AT 7:48 PM
Tiny
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Okay. Here we go. I've hooked up the harness and connected the ignition. Got a door light and a brake light that came on. My question is what are the chances that when the wires melted something arched and fried the computer or would the starter still spin over?
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Saturday, April 29th, 2023 AT 5:45 AM
Tiny
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Hi,

If there was a short, certainly the body control module could have been damaged. Do any of the other electrical components work properly? Also, you mentioned the starter. Is it working correctly?

I attached the body control module schematic below, so you have it as a reference.

Let me know.

Joe

See pics below.
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Saturday, April 29th, 2023 AT 7:13 PM
Tiny
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I haven't hooked up everything as of yet. Only the ignition and key switch. And the a few grounds. As for the starter I bought new from rockauto. I will test it just for giggles to make sure it works.
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Sunday, April 30th, 2023 AT 4:36 AM
Tiny
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Hi,

Okay. Let me know what you find. Also, let me know if the starter works. LOL It should. I've had good luck with them over the years.

Take care,

Joe
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Sunday, April 30th, 2023 AT 5:57 PM
Tiny
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I went through the fuses and 3 were blown. 1 for the hazard and 2 more. I replaced the 10-amp fuse for the hazard and the fuel pump kicked on and wouldn't kick off. Until I pulled the fuse out. Weird. But it still wouldn't turn over. I ran out of light so I will check the starter tomorrow and let you know what happens. Also, I opened the computer to check the board. I didn't see anything that looked burned or melted. It looked good to me. It's under the dash tucked away in the upper left corner behind the fuse box, correct? Metal box that the harness connects to?
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Sunday, April 30th, 2023 AT 10:09 PM
Tiny
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Hi,

According to the manual, it is behind the AC switch panel (center dash).

Let me know what you find.

Joe
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Monday, May 1st, 2023 AT 6:59 PM
Tiny
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Starter is good. I've got dash lights and a taillight on. The chimera for the keys on as well. Does my Elantra have an anti-theft system in it? There is a black box with antenna behind the A/C controls with etacs. Is this an anti-theft module? I have a regular key in ignition. Would that cause the starter not to turn over? All this is beyond my pay scale.
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Monday, May 1st, 2023 AT 11:00 PM
Tiny
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Hi,

It could have an alarm system. Also, the ETACS is the BCM on this vehicle. Have you tried scanning the can-bus at this point? It may point you in the right direction. Also, if it has anti-theft, the starter will still engage but the engine won't start.

See pics below.

Joe
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Tuesday, May 2nd, 2023 AT 6:54 PM
Tiny
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I put the OBD scanner on, but it'll only go to 96 % then tell me it's communications error so I've been slowly hooking up everything. But it still only goes up to 96% so I think I'll have to get everything else hooked up then I'll try again and keep trying until something gives. I'm closer everyday but just can't get over that hump and get it started. I'll keep you posted and if I have any questions I know where to turn. Thanks for all your help so far. Between you me and Google I'll have this car back on the road in no time.
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Tuesday, May 2nd, 2023 AT 8:22 PM
Tiny
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Do any of you guys have a illustration of the harness layout? Where tall the connectors will go? How it should look? Oh, and I got it to turn over. It would've fired up if I had the throttle body on it.
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Thursday, June 8th, 2023 AT 3:35 PM
Tiny
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Hi,

Normally, the manuals don't provide harness routing. I did find one for under the dash and have attached it below, but it is vague and difficult to follow. They show connector numbers but provide no legend. Ugh!

I'm glad to know you are making progress. Stay in touch.

Take care,

Joe

See pic below.
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Thursday, June 8th, 2023 AT 8:31 PM
Tiny
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I've looked and looked all over the web and can't find a good illustration of the layout. On my ignition there are 4 connections, but I can only find 3 to plug in. My fuel pump is not kicking on now. I thought that it might be the 4th connections I can't find. The illustration that you attached really doesn't show where everything hooks up.
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Wednesday, June 21st, 2023 AT 8:27 AM
Tiny
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Hi,

Let's try narrowing it down. If I look for specifics, I usually can find things. When you say on your ignition, there are. Are you referring to the ignition switch or something other?

As far as the ignition switch is concerned, take a look below and let me know if I am on the right track.

Take care,

joe

See pic below.
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Wednesday, June 21st, 2023 AT 11:01 PM
Tiny
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I found out what I was looking for. I went to the junk yard and took one apart a took some pictures. Don't know if the fuel pump will kick on because it got dark on me. I will update this evening.
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Thursday, June 22nd, 2023 AT 5:34 AM
Tiny
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Update: I tested the fuel pump relay and it's good. I ran wires straight to the battery from the pump and it came on. It still will not come on with the key. Is it possible I fried the ECM while hooking up the wire harness or could it still be ground issues?
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Thursday, June 22nd, 2023 AT 4:51 PM
Tiny
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Hi,

If you ran power from the battery and it ran, the ground has to be present. If you jump pins 30 and 87 at the relay, does it come on?

Joe
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Thursday, June 22nd, 2023 AT 8:09 PM
Tiny
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I have not jumped those yet. I hooked up power to the relay and put my meter on it too. The relay clicked. But I didn't jump them in the socket. So I'll try that tomorrow after work.
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Thursday, June 22nd, 2023 AT 8:14 PM
Tiny
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Hi,

Sounds like a plan. You shouldn't need to supply power. It should be present.

I'll watch for your findings.

Joe
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Thursday, June 22nd, 2023 AT 10:51 PM
Tiny
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I put a jumper wire between the 30 and 87 and nothing happened. I hooked my obd scanner (little cheap one) up and it only throwing 1 code. P0885 which is TCM power relay. Would the cause the fuel pump not to kick on. And is the TCM the same and the ECM?
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Sunday, June 25th, 2023 AT 12:23 PM

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