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4WD engagement problem #779210 01/11/07 05:32 PM
Anonymous
Unregistered
My Truck is a 95.5 Tacoma extra cab with v6, 4 wheel drive, and manual transmission.

My problem is the truck no longer goes into 4 wheel drive.

Light does not light up on dash when selector is put into 4 wheel high or low and more importantly no power is going to the front wheels.

Can someone give me steps to diagnose whether it is an electrical
problem, a transfer case problem, or if the hubs are shot?

Thanks in advance for any advice.

Regards,

D
Re: 4WD engagement problem #779211 01/11/07 05:50 PM
Joined: Jan 2000
Posts: 12,153
N. California. USA
4Crawler Offline
Web Wheeler
*****

r.c.brown@ieee.org
TruckEditor@tlca.org
Project: 4Crawler
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Re: 4WD engagement problem [Re: 4Crawler] #779212 01/11/07 06:30 PM
Joined: Jan 2007
Posts: 10
M
MDMarc Offline
Need a Spot
i have the same problem, not sure the solution but if I switch the vacuum lines when I need 4wd on the valves explained in the above referenced article the 4wd once again works... when you pull the line off notice if you hear of feel vacuum? I've decided rather than spend time diagnosing the problem I'm going to switch to manual hubs shortly...
Re: 4WD engagement problem [Re: MDMarc] #779213 01/11/07 08:13 PM
Anonymous
Unregistered
I have manual hubs. So I am guessing I dont have vacuum lines.
Re: 4WD engagement problem [Re: 4Crawler] #779214 01/11/07 08:16 PM
Anonymous
Unregistered
Do all tacomas use ADD?
I have manual hubs and t case is shifted from top via t case stickshift next to transmission stickshift.
Re: 4WD engagement problem #779215 01/11/07 08:52 PM
Joined: Jan 2000
Posts: 12,153
N. California. USA
4Crawler Offline
Web Wheeler
*****
One way to tell is get underneath and look.

And to check the compnents, lift the front tires off the ground. Lock and unlock the front hubs and see if the CV shafts turn with the wheels w/ hubs locked. Then try the front shaft, should turn free in 2H and not turn in 4H or 4L, assuming a directly shifted t-case.

Last edited by 4Crawler; 01/11/07 11:37 PM.
r.c.brown@ieee.org
TruckEditor@tlca.org
Project: 4Crawler
4Crawler OffRoad - 4x4Wire discount code
Re: 4WD engagement problem [Re: 4Crawler] #779216 01/11/07 10:50 PM
Anonymous
Unregistered
I did, but did not figure vacuum lines were on diff.
I will give it another shot.

Thanks.

D

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