First of all, I want to let you know that this is an outstanding forum. I have learned a lot here and saved a ton of money doing my own repairs.

I have a question about the UVC harness. I replaced the harness under the driver side valve cover after some time spent here. I got the usual symptoms, SES light on, loss of power, etc. The plug was very loose and shims did not help. After replacement, the SES light is still on.

I used the wiring diagram and the 42 pin connector to see what else may be wrong. The driverside check shows all 4 injector readings at 3.1 ohms and GPs at 0.6 ohms.

The passenger side is a whole different story. Injector 1 reads 4.0 ohms, #7 reads 6.1 ohms, #3 reads 640 ohms and #5 is open. These readings are from the 42 pin plug through all connectors. My concern is that #1 and #7 are the outside pins on the plug, and #3 and #5 and inside pins. If the plug was loose, I would think that one of the outside pins would also be open.

The passenger side valve cover looks like it will take a lot more time and effort to get off. So, I am going to get meter readings at the VC connector after work today. If I have to take the VC off, is there anything tricky I need to be aware of? Any advice on how to do this?

Thanks in advance!

 

Sounds like you've done your research well. You make a good point about the outer / inner pin readings, so be sure and let us know what you find.

As you intend, I think I would OHM the pins at the VC next to see if you get the same readings. If not, then you can OHM for continuity between the VC and the 42 pin connector. Maybe you've got some chaffing issues between the IDM & valve covers.

 

For what it's worth, it seems as if most UVC problems are on the passenger side. There are a couple of bolts that are tough to access. If I remember correctly I actually sat on the fender and reached over and back to get at em. A few beers will help, as it always does.....

 

Well, I hooked up my meter to the 42 pin connector and unplugged the 9 pin connector at the VC. All of the passenger side wires from the 42 pin connector to the 9 pin connector ohmed out good. I checked the connector pins on the passenger side VC and injectors 1,3, and 7 each read about 4.2 ohms. Injector #5 shows to be open. I guess my next step is to get that VC off.

How long does that usually take? I would normally take my time, but I need to get this done by Friday evening, and Friday is a holiday, so I gotta get parts tomorrow and I gotta work all day tomorrow. Any suggestions?

Thanks.

 

Should only take 20-30 minutes to get it off. Remove the IC pipe and the few other things in the way on top, unbolt it and manuever it out. It's a bit of a puzzle, but it does come out.

 

Okay. Thanks for all of your help. It took me an hour to get the VC off, but I found the problem. The harness plug was about to fall off. I plugged it in and 3 injectors read 3.2 ohms and one reads 5.0 ohms. Does the one higher reading injector need to be replaced? I have to go get parts tomorrow.

Thanks.

 

5 ohms is the cut off for checking the wire circuit. I assume you're placing the OHM meter at the 9 pin pass through connector to do your OHM test. Try unplugging the harness inside the valve cover and do the OHM test from the plug. You can also check the pins in the pass through connector for continuity to make sure your loose plug didn't damage the #5 pin.

 

Yes, I read from the 9 pin connector first, then I went all the way back to the 42 pin connector and checked continuity to the injectors. I got the previous post readings from the 42 pin connector. That's a good idea to check continuity at the pass through connector. I will do that tomorrow. I'm also gonna get a new harness in the morning. Southwest International has them for $41.

 

I have had quite a few uvc's come loose and knock out #3 or 5 before, wierd but does happen.