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Re: 4X4 not working
Locking and unlocking of the fropnt axle is controlled by vacuum switching valves. They are mounted on the front axle, drivers side. The most common failure in those is an internal leak (could also be a vacuum or electrical problem). There's also a switch that senses when it's locked or unlocked. That is telling the ECM it isn't locking, which gives you the flashing light.
The part is around $75 online and about 20 min to install.
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84 4Runner - ARBed 5.29s F&R, 4.7 & 2.28 t-cases, Chevys, AP x-over, BudBuilt x-member, 2" drv trn lift, 36" TSLs, 30 spline Longs
80 something p/u - Buick 231 V6/TH-350 trans, Holley 4 bbl, Weiand intake, dual batts, dual tanks ...
89 4Runner - stock
2000 Isuzu Trooper + 2010 Sonata
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