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Old 08-12-2006, 01:43 PM   #1 (permalink)
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Donr
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Hi everyone
I think I just made a very big booboo. My oxygen sensor on my 95 Sonata was broken.(2L) A friend gave me a honda sensor to try out. It does fit in the exhaust pipe but the wiring is different. The Sonata has 4 wires and the honda has 1. So I cut of the 4 wires in an attempt to find the one that was live. In doing so, the wires touched and you guessed it, big sparks.
Now the car wont run. I can start it but black smoke coming out of the exhaust and I have to keep my foot on the gas. I can hear a relay on the lower right side of the passenger compartment clicking on and off like crazy. Did I just blow my computer and how and what can I check? I checked all the fuses in the passenger compartment and under the hood and all are ok. Sometimes, it just doesn't pay to be cheap.
Don
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Old 08-12-2006, 04:50 PM   #2 (permalink)
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robtemple is an unknown quantity at this point
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Quote:
Originally posted by Donr@Aug 12 2006, 10:43 AM
[b]
I think I just made a very big booboo. ... Sometimes, it just doesn't pay to be cheap.
Don
[snapback]51183[/snapback]
It rarely pays to be cheap..


Double check all fuses, replace o2 sensor with correct unit....say a prayer, and if it's still dead, sounds like you fried your ecm.
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Old 08-12-2006, 05:33 PM   #3 (permalink)
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Donr
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Quote:
Originally posted by robtemple@Aug 12 2006, 04:50 PM
[b]It rarely pays to be cheap..
[snapback]51205[/snapback]
I'm not usually!. I want to sell the car and decided I would give it a try. Bad idea I know.
No dtc's stored in the ecm. Just the regular rapid pulses. Any other suggestion of things I could do besides buying the parts to discover that the ecm is shot. I don't think it will be worth repairing if that is the case.
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Old 08-12-2006, 06:09 PM   #4 (permalink)
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robtemple is an unknown quantity at this point
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Well, you could go to hmaservice.com and see if there is any related info.
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Old 08-13-2006, 12:46 PM   #5 (permalink)
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Donr
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Unfortunatly, no help at hma. The shop manual states not to short the wires ,which I did, because it will cause damage, which it did. My question is, cause damage to what? What is the most relevant device that shorting the O2 sensor would blow; ecm, power transistor,mpi relay...?
The manual also states somewhere that should the O2 sensor be defective, the car will operate in the mode that is programmed in the computer. This is what I think, the mode it was running in before I sarted playing with it. It also mentions that:
"If the sensor connector is disconnected with the ignition
switch turned on, the diagnostic trouble code is memorized.
In this case, disconnect the battery negative terminal (-) for 15
seconds or more, and the diagnosis memory will be erased."
I disconnected a few sensors while the switch was on and it did not register any dtc's. My reasoning is that, if it was running in limp mode before the short, now it has no programmed mode left because I blew it. And since it does not register any codes,the ecm must be defective. Unfortunatly, an O2 sensor is $150.00 here. I dont know what an ecm would cost but my guess is more than the car is worth. Now, that is why I would like to be able to determine what could be wrong before buying parts that I cannot return if the part it was replacing is good. BTW, the car won't start anymore.Thank's for your help.
Don
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Old 08-13-2006, 12:59 PM   #6 (permalink)
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Ferginho
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Hi Donr,

How do you know if your in limp mode?



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Old 08-13-2006, 02:46 PM   #7 (permalink)
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Donr
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I dont but seeing that the sensor was broken clean of and hanging, idle was way down when the a/c was on, I figured that the ecm was in limp mode to keep the car running.
Don
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Old 08-13-2006, 06:37 PM   #8 (permalink)
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Ferginho
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Any chance of finding an ecm on a similar car in a breakers yard? Probably the cheapest way of replacing if you just want to get on the road to sell.

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Old 08-13-2006, 06:46 PM   #9 (permalink)
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Donr
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Quote:
Originally posted by Ferginho@Aug 13 2006, 06:37 PM
[b]Any chance of finding an ecm on a similar car in a breakers yard?*

[snapback]51348[/snapback]
Probably and I will check tomorow. But still, I would have liked a more structured approach of diagnosing the problem instead of buying all sorts of parts that I can not return. Thanks for your help.
Don
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Old 08-13-2006, 06:55 PM   #10 (permalink)
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The first time I came across a car with a computer in it I knew there would be nothing but trouble. Give me manually adjusted points, vacuum/centifugal timing advances and cables ant day!!

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