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  #1  
Old 06-22-2009, 04:41 PM
agg_bagg agg_bagg is offline
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help me do the UVCH ohm test correctly please.

ok guys my truck hasn't been running very well lately. it acts like it is out of gas and stuff. well i changed the oil and fuel filter and also changed the injector oil.

it runs better but it still kinda lopes a little bit. i read in here about the UVCH coming loose so i pulled the plugs off and did the ohm test but i can't get it to work very well all of my test come up saying 0.000 the glow plug and the injector test come up the same. i have my volt meter set to the setting that looks like and upside down U. that is the right setting right.

this is the volt meter that i have

Northern Industrial Portable AC/DC Digital Clamp-on Multimeter | Clamp Meters | Northern Tool + Equipment

i am not the best with electrical stuff so any help to make sure i am doing this right would be awesome and is it normal to have all 0.00 on all your readings.
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  #2  
Old 01-16-2012, 12:31 PM
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Huh, I just did a search for this because I have the exact same question!
I know its an old thread, but I figured I would bring it up again. I cant believe nobody responded.

I am pretty inept when it comes to electrical stuff and not even sure that I know how to use my ohm meter. Can anybody point me in the right direction here?

I think I need to do the .50 cent mod, but I want to test it first.
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Old 01-16-2012, 12:51 PM
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In the bottom video on the link down below, ken is checking Glow plug resistance. Use the center terminal c, and measure resistance between c and Each i to check injectors. Measure resistance of the glow plugs between g and battery ground. Values are down at the bottom.



Terminal positions=G G I I C I I G G
G=Glow Plug
I=Injector +
C=Injector -

Ohm Glow plugs between "G" and Battery Negative post. Should be between 0.1 and 2.0 Ohms

Ohm Injectors Between "C" and "I" should be < 5 ohms
https://sites.google.com/site/woodnt...ow-plug-system
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Old 01-16-2012, 01:58 PM
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Quote:
Originally Posted by carltonwebb View Post
In the bottom video, ken is checking Glow plug resistance. Use the center terminal c, and measure resistance between c and Each i to check injectors. Measure resistance of the glow plugs between g and battery ground. Values are down at the bottom.



Terminal positions=G G I I C I I G G
G=Glow Plug
I=Injector +
C=Injector -

Ohm Glow plugs between "G" and Battery Negative post. Should be between 0.1 and 2.0 Ohms

Ohm Injectors Between "C" and "I" should be < 5 ohms
https://sites.google.com/site/woodnt...ow-plug-system
Ken does great write ups. Thanks for posting the link since I had missed that on his website when I was browsing it last...

btw, the center injector (C) pin is 12v positive...the test still works exactly like you describe though.
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Old 01-16-2012, 02:02 PM
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When I was doing all that to the 2001, I went through and saved the info to one piece of paper in microsoft word. Then I took it out to the truck b/c my memory is not very good. That piece of paper is ruined now but the info is still saved on the computer. I cut and pasted the info on the inj terminals into that so I am not sure where on here it came from> Thanks for correcting the info on the polarity.

I wish i had that harness Ken has in that video when I was doing it. Having the shakes and those little pins makes it hard.
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Old 01-16-2012, 02:24 PM
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Quote:
Originally Posted by carltonwebb View Post
When I was doing all that to the 2001, I went through and saved the info to one piece of paper in microsoft word. Then I took it out to the truck b/c my memory is not very good. That piece of paper is ruined now but the info is still saved on the computer. I cut and pasted the info on the inj terminals into that so I am not sure where on here it came from> Thanks for correcting the info on the polarity.

I wish i had that harness Ken has in that video when I was doing it. Having the shakes and those little pins makes it hard.
Yeah, that harness clip is a great idea.

I though about making a injector break out box but then I discovered that the center pin is positive and I got stuck because I didn't know what to do with the power pulse intended for whichever injector was turned off. Just switching off the negative side would mean the IDM is still sending a 12v positive pulse to that pin and could possibly harm the IDM. Not sure exactly, but it sounds plausible.

In case you don't have this already....here is a neat wiring diagram of the engine compartment components.
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Old 01-16-2012, 02:24 PM
 
 
 
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