ECM and O2 Sensor fuses keep blowing

[Green Dragon]

The wiring harness inside the driver’s side fender rub and short out, usually causing Transmission Mode switch failure but in your case may be affecting O2 sensors & ECM

Further if 3 of 4 O2 sensors were indicating problems, I would look at the other end, that being the MAF Sensor- Air Filter- incoming air.

HTH
Bob

[kpv]

Can someone please post a picture of exactly where I need to look for the harness short behiond the driver's side headlight??

[kpv]

OK, the latest and greatest.

I got the VX running, HOWEVER, now 3 fuses keep blowing.

The first is the large, box type, 40A "ECM" fuse in the engine compartment fuse box.

The second one is the "O2 sensor" fuse in the engine compartment fuse box.

The third, and newest discovery, is the 15A "Engine" fuse in the passenger compartment fuse box.

The VX starts and will sit and run for as long as I let it. As soon as I get in it and drive it, I can't get farther than my driveway and it stalls and blows all 3 fuses.

While it was running, I moved around all of the harnesses in the engine compartment that I could reach thinking that if one was frayed, it would short and stall the car. Nothing happened, it kept on idling.

Besides just replacing all 4 O2 sensors only days ago, I replaced my mode switch a few months ago and that fixed the "clunking" gear changes in the transmission. Could the mode switch be bad AGAIN!!!!!?????

There is a little adjustment on the mode switch and when I installed it, I just bolted it up and the transmission worked great so I didn't move the switch one way or the other and left well enough alone. Should this be adjusted? Is it related?

If anyone has any ideas, I would greatly appreciate it.

[thebear54]

It sounds like to me that you have a massive short, possibly inside the center console area(if the only time you blow fuses is when you attempt to put the VX in gear)or wires coming through the hump. My advise(although time consuming) would be to pull the center console to check the wiring harness.
Good luck
John

[kpv]

Can someone PLEASE post a picture of the area of the harness that is prone to shorting behind the left headlight????? I looked there and pulled all three harnesses away from the body and they look perfect.

Has anyone had any issues with the engine bay fuse box having a short????

[Cyrk]

http://www.vehicross.info/forums/sho...ghlight=Frayed

From Anita:
The one that Im referring to runs just right of.... shoot...I dont know the name of the parts of the engine. Its to the right of the engine, about halfway back. Wrapped with black tape...

But yes, several owners including me have had experiences with that particular harness as well.

[kpv]

Cyrk,
Thank you so much for the picture! I jiggled that harness when the car was running but didnt do anything further with that one at the time. I thought you guys were talking about the three harnesses that are immediately in front of that one (about 4 inches more forward) that actually clip to the radiator support.

Where along the one that you are pointing to have the shorts been found??

[Ruflyf]

The wiring harness inside the driver’s side fender rub and short out,

Green Dragon or anyone who has experienced this know whether its a short to body frame or from 1 wire to another within the harness? I have had a problem lately blowing the 40a ECM fuse whenever the vx got jarred vertically. Anyway this morning I got to jiggling wires under the hood and sure enough the harness that is mentioned behind the drivers side headlight is the culprit. I looked it over real good and didnt see any immediate signs or a short, so does anyone know if the short historically has been from wire to wire inside the harness or a wire rubbing through the insulation to the frame? Figured I'd ask before I start tearing into the harness and inspecting each wire.

[Anita]

My short was from a wire within that harness. The mechanic said it was a bee-otch to get to.

[Ruflyf]

thats what i was afeid you were gonna say. Oh well 90% is finding the problem, 10% is fixing it. Thanks for the info.