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post #1 of (permalink) Old 07-27-2002, 10:27 PM Thread Starter
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YJ - anyone have a 4wd vacuum diagram?

Does anyone have a vacuum diagram for the front axle vacuum thingy on a YJ? Actually, I'm trying to figure out what to do with a red and a blue line in the area under the battery.

This is on a friend's Jeep. The front axle doesn't engage, and the 4x4 light on the dash doesn't come on. I found those two hoses just hanging loose, but can't figure out where they go.
It's a 1988 w/258 and TF-999 if that matters.
Thanks
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post #2 of (permalink) Old 07-28-2002, 03:19 AM
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Re: YJ - anyone have a 4wd vacuum diagram?

my T case switch is long gone. when I go wheeling I pop the hood and move the vac lines manually. I capped the black and one yellow. when I want 4wd, I move the red to the yellow. when I go back to the street. I move the red to the green.


red is vacuum from the engine. it does go thru a round thing that I think is a check valve.

coming from the axle two yellows, a black, and a green.

Black is the 4WD feed back, vacuum will be present on this line if 4WD is engaged, it is used to connect to the 4wd light sensor thing.

The green is the disengage. vacuum is applied to this in two wheel to make sure the disconnect is fully disconnected.

the yellows are the same circuit. Vacuum is applied to yellow for 4wd.


I've attached a drawing from one of the guys on the board, bee240 or something like that. It is for an XJ. one of the differences is that his has the "T" with yellow and white and mine has a "T" with both yellow.
[image] http://tellico.off-road.com/wwwthrea...5-86xjtcas.jpg [/ image]
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post #3 of (permalink) Old 07-28-2002, 06:15 AM
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Re: YJ - anyone have a 4wd vacuum diagram?

I would say get rid of that vac/elec mess and make or buy a cable locking system.
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post #4 of (permalink) Old 07-28-2002, 08:51 AM
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Re: YJ - anyone have a 4wd vacuum diagram?

Click on the link in my signature for the vaccuum diagram, and instructions on where everything goes.
It's not exactly the tf999, but it should help.
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post #5 of (permalink) Old 07-28-2002, 10:20 AM Thread Starter
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Re: YJ - anyone have a 4wd vacuum diagram?

So the red ones gets manifold vacuum, and the blue one doesn't connect to anything?

That should be easy enought to fix, I just need to connect the red one. I'll try it and see what happens.
Thanks for the help!
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post #6 of (permalink) Old 07-28-2002, 11:16 AM
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Re: YJ - anyone have a 4wd vacuum diagram?

You've got it.
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