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

Security Light on car wont start

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Old Oct 3, 2003 | 08:45 PM
  #31  
Lyle A's Avatar
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OK. Since the dash is apart it will be easier. First, check the wiring to your MAF and make sure it is all in good shape. Unplug it and replace the fuse( I hope you have a good supply of the same fuse size) Try the Ignition switch again. If it blows that rules out the MAF itself. I'm looking at a 94 GM manual. I assume it is the same as your 95. Camaro and Firebird Wiring are 90% identical if not completely. If you have ruled out the MAF,leave it unplugged, then unplug the PCM connector that has wire 439 in it, unplug the Theft deterrent module, and the fuel pump relay. Check the load side of fuse 5 to ground with a meter. If it reads anything, you either left something plugged in or you have a short on that pink wire.( instead of using as meter, you could replace the fuse again, turn the key and see if the fuse blows) If you read a short then you have to trace that wire out untill you find it. It's not easy, but it's not that hard either. I hope this helps. Shout back if you have more questions.
Old Oct 3, 2003 | 09:01 PM
  #32  
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Will do Lyle thanks for the info im going to try that tomarrow if it dont go crazy over it before then. Will let you know if i find it or not.
Old Oct 4, 2003 | 01:39 PM
  #33  
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Here goes i bought some more fuses. I unplugged teh MAF hooked up the battery still the security light was on. I then turned the key to on and a groaning sound came from it sounded like the Fuel relay fuse. Also none of the guage lights came on and teh tach was doing some wierd stuff. When i turned the key to start the check engine soon light came on. and the guages died.

I plugged the MAF back in but the same problem happend neither time the did the #5 PCM fuse blow. After about 3 tries the groaning sound from the Fuel relay stopped and now the car still does nothing Securty light is always on. When the Key is turned to start the Fuse does not blow and the car will not even try to turn over.

Im ready to seriously sell the car.
Old Oct 4, 2003 | 03:05 PM
  #34  
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Dude...this is absolutely rediculous! I'll be back home late Sunday night and I'll come over and check things out on Monday if your not working or anything. If I can't find it then I'll get my friends Dad to come over...he's the master mechanic...if he can't figure it out then I'll get my mechanic to check it out...if both of them can't figure it out then I'll buy your car! Whats your cell number or house number and I'll call you and get ur address!

-Eddie
Old Oct 4, 2003 | 03:15 PM
  #35  
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704 258 8274 Man if we could get it started that would seriously rock.

- Josh

Last edited by Ponykillr; Oct 4, 2003 at 03:18 PM.
Old Oct 4, 2003 | 04:39 PM
  #36  
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In that case I think your problem is the Anti Theft Module because it controls both the fuel relay and starter. All the stuff I said to check runs off the same PCM ign. fuse so keep that in mind when troubleshooting. Once again, Good luck, I hope the problem soon. There is a slim chance it's your PCM, but I hope not. Always rule out the simple stuff first.
Old Oct 4, 2003 | 04:53 PM
  #37  
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If it is the Anti Theft is there a way to bypass all of it? Also i could not find the PCM connector with the 439 wire. Which plug is it and where?

Also would a bad modual cause the guages to act weird? Now the lights that did come on do not, only the SES and Security come on now.
Old Oct 4, 2003 | 05:11 PM
  #38  
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Update I charged the battery again and the problem went back to the original symptoms. I unplugged teh MAF and the fuse blew. I dont know where the PCM plug was so I went and unplugged the VATS modual black box green plug, the Fuse blew. I then unplugged the Fuel relay and the fuse did not blow. every time i plug it in and try it blows the fuse.
Clould it be the relay if so how much to replace and is there anything else i need to check? Also what would cause it to go bad?
Old Oct 4, 2003 | 05:24 PM
  #39  
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Yep, It looks like you found the culprit but it could be on the other side of the fuel pump circuit if the fuse doesn't blow untill its energized. That could be what's happening. Check and make sure the fuel pump prime connector is clear of a short. With power off check the prime connector terminal to ground with an Ohm meter. There should be some resistance, that of the pump itself. IF it goes to 0 then your problem is in the wiring to or the fuel pump itself. Can't tell you what the cause is, only the solution hopefully
Old Oct 4, 2003 | 05:27 PM
  #40  
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I'm also thinking it's a possibility that the fuel pump capacitor is shorted which will also cause that problem.
Old Oct 4, 2003 | 05:34 PM
  #41  
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Hurm interesting too bad i really have no experience in the fuel department. Any tips on where to look for that stuff, also i do not have an ohm meter i guess i will have to go buy one.
Where is the fuel pump prime connector and its ground located?
Also does the relay make any types of noises? when the battery was low on juice it made a groaning sound and would not blow the fuse. When the battery is charged good it doesnt make noise and blows the fuse.
Old Oct 4, 2003 | 05:39 PM
  #42  
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You will need an ohm meter from this point. Try to find someone that know how to use it to help. One important thing is to make sure power is off to check resistance. If you don't have a top dollar meter you can fry it by checking resistance with power applied. The Fuel Pump Prime Connector is shown here.
Old Oct 4, 2003 | 05:54 PM
  #43  
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Found it it should not be plugged up to anything right? Test it with the battery connected but the key not turned to on? Lets say it reads 0 utill i find someone to help me with a meter what could i look for?
Old Oct 4, 2003 | 06:03 PM
  #44  
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It should not be plugged into anything and if you read 0 with an ohm meter to ground then you are on the right path to your problem because it should not be 0. It should be over 1000 ohms at least. I don't know the exact resistance of the pump is.
Old Oct 4, 2003 | 06:12 PM
  #45  
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I just checked my fuel pump prime conn to ground and got 3.65 ohms. So My first guess was off a bit.



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