4WD problem

[Pismo10]

I have 2000 tundra, I push the 4wd hi button and get nothing, it just flashes, never engages no matter what I do. It worked fine last fall, stored for the winter, then worked once this spring now not working at all, just flashing.

Any ideas what is wrong?

Thanks very much
Pismo

[390FE]

I don't know much about newer 4x4 systems but its possible it could be a vaccume issue.

I know some other manufacturers that have th push button 4x4 are actually vaccume engaged.

If not vaccume it could be the switch itself.

[nate00]

the system on the tundra uses electric motors to opperate the 4wd there is a motor on the ft diff and a motor on the transfer case. the fault is eighther a bad motor or an electrical/ computer problem. have someone opperate te 4wd button and look to see if you can see the ft diff motor opperate, it is usally the cause. good luck

[Pismo10]

Thanks, It seems to work sporadically when cold, when I first start it up. Never works after running for a while. I believe the dash switch works because I hear/feel something happen when I press it. Then the flashing begins.

Thanks

[Rycam]

Not having personal knowledge of this system, the flashing likely indicates a problem detected in that sytsem.

For $0.00, I would get under the truck, and inspect all electrical connectors on the tranny and diffs. Take a few minutes to trace the wiring harnesses underneath...looking for pinched wiring, breaks, and loose coonectors. Taking off the electrical connectors, looking for corrosion, and spraying an aerosol "electronic terminal cleaner/lube" that is plastic-safe may be the fix. A large can of this is usually around $10 at places like Lowe's/Radio Shack/Home Depot.