I think I messed up my car... great...

Max777 · 12-02-2008, 06:04 PM

ok, so my car was running weird, and this is what I just found:

http://teamfc3s.org/info/articles/o2sensor.html

In the article, it says that the 02 sensor wire is shielded, and that he tried to fix it with a spade connector, and that this ended up shorting the circuit.

Well, since I bought a racing beat header, I used crimps, and a piece of normal wire to extend the wire back to it's original location.

Well, how bad did I mess up? Will I need to buy another ECU now?

Whizbang · 12-02-2008, 06:08 PM

get out a multimeter and see what the resistance of the circuit is

Max777 · 12-02-2008, 07:00 PM

Uhhhh....

now, how exactly would I go about that?

like, KOEO (Key On Engine Off), then set the meter to Ohms and check red to connector and black to ground?

Or should I have the key off?

I have a multi meter, but the circuit is only one wire? Also, the car will not run right now, so can i still measure it? Also, what do you think gets shorted, the sensor itself, or something in the wiring like a resistor in the ECU?

The guy talks about a wire that goes out of the loom (harness?) so maybe it's just the harness wire that is shielded and not the sensor wire from connector to sensor?

That would actually make sense, because the harness wire runs along side all those other wires, while the sensor wire hangs free for the most part...

TehMonkay · 12-02-2008, 07:44 PM

mine didnt look insulated, the inside the harness one did though.

Max777 · 12-02-2008, 08:08 PM

Ok, well that does help, this article did mention specifically about the harness side wire so...

Great! This means that everything should be fine at least with this part of the car, lol.

Fidelity101 · 12-02-2008, 09:36 PM

You never should have current running through a circuit it when checking resistance, you will blow your DVOM.

Max777 · 12-02-2008, 10:59 PM

Is that with ohms too? I know a couple people in my class popped a fuse when they measured aperage wrong, but I didn't know that you can also do that on the Ohm's setting... althrough, I did just remember that you check resitance with circuit off... lol.

Well, thanks for reminding me before i messed up some equipment!

Whizbang · 12-03-2008, 12:11 AM

the idea would be that you have no resistance between then say the O2 and probably one of the grounds on the ECU pinout. Well, you will have SOME resistance since all conductors have resistance, but there will be very very very little or it will be reading resistance on things it shouldnt. Would have to spend time with the FSM wiring diagrams to really get an idea of what the circuit is supposed to be

Fidelity101 · 12-03-2008, 12:19 PM

Quote:

Originally Posted by Max777

Is that with ohms too? I know a couple people in my class popped a fuse when they measured aperage wrong, but I didn't know that you can also do that on the Ohm's setting... althrough, I did just remember that you check resitance with circuit off... lol.

Well, thanks for reminding me before i messed up some equipment!

Glad I could help

12-02-2008, 06:04 PM	#1
Max777 Pirate Join Date: Mar 2008 Location: Central IL Posts: 1,323 Rep Power: 19	I think I messed up my car... great... ok, so my car was running weird, and this is what I just found: http://teamfc3s.org/info/articles/o2sensor.html In the article, it says that the 02 sensor wire is shielded, and that he tried to fix it with a spade connector, and that this ended up shorting the circuit. Well, since I bought a racing beat header, I used crimps, and a piece of normal wire to extend the wire back to it's original location. Well, how bad did I mess up? Will I need to buy another ECU now? __________________ Rotaries:They are NOT that complicated!

12-02-2008, 06:08 PM	#2
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp Posts: 3,190 Rep Power: 21	get out a multimeter and see what the resistance of the circuit is __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook

12-02-2008, 07:00 PM	#3
Max777 Pirate Join Date: Mar 2008 Location: Central IL Posts: 1,323 Rep Power: 19	Uhhhh.... now, how exactly would I go about that? like, KOEO (Key On Engine Off), then set the meter to Ohms and check red to connector and black to ground? Or should I have the key off? I have a multi meter, but the circuit is only one wire? Also, the car will not run right now, so can i still measure it? Also, what do you think gets shorted, the sensor itself, or something in the wiring like a resistor in the ECU? The guy talks about a wire that goes out of the loom (harness?) so maybe it's just the harness wire that is shielded and not the sensor wire from connector to sensor? That would actually make sense, because the harness wire runs along side all those other wires, while the sensor wire hangs free for the most part... __________________ Rotaries:They are NOT that complicated! Last edited by Max777; 12-02-2008 at 07:04 PM.

12-02-2008, 07:44 PM	#4
TehMonkay Rotary Fanatic Join Date: Apr 2008 Location: Louisville, KY Posts: 302 Rep Power: 18	mine didnt look insulated, the inside the harness one did though. __________________ My car blows up everytime I start it, it's rotary

12-02-2008, 08:08 PM	#5
Max777 Pirate Join Date: Mar 2008 Location: Central IL Posts: 1,323 Rep Power: 19	Ok, well that does help, this article did mention specifically about the harness side wire so... Great! This means that everything should be fine at least with this part of the car, lol. __________________ Rotaries:They are NOT that complicated!

12-02-2008, 09:36 PM	#6
Fidelity101 Reliable Source Join Date: Nov 2008 Location: Michigan/Illinois Posts: 336 Rep Power: 18	You never should have current running through a circuit it when checking resistance, you will blow your DVOM. __________________ My Rx-7 Vids

12-02-2008, 10:59 PM	#7
Max777 Pirate Join Date: Mar 2008 Location: Central IL Posts: 1,323 Rep Power: 19	Is that with ohms too? I know a couple people in my class popped a fuse when they measured aperage wrong, but I didn't know that you can also do that on the Ohm's setting... althrough, I did just remember that you check resitance with circuit off... lol. Well, thanks for reminding me before i messed up some equipment! __________________ Rotaries:They are NOT that complicated!

12-03-2008, 12:11 AM	#8
Whizbang Respecognize! Join Date: Jul 2008 Location: Δx = ħ/2Δp Posts: 3,190 Rep Power: 21	the idea would be that you have no resistance between then say the O2 and probably one of the grounds on the ECU pinout. Well, you will have SOME resistance since all conductors have resistance, but there will be very very very little or it will be reading resistance on things it shouldnt. Would have to spend time with the FSM wiring diagrams to really get an idea of what the circuit is supposed to be __________________ For current updates and event coverage check out Follow on Twitter! @WhizbangRally Whizbang Rally's Webpage \| Facebook