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4Wheel Drive Wont Engage

Old 09-12-2005, 08:10 AM
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Question 4Wheel Drive Wont Engage

I recently purchased a 1991 4Runner 4x4 and am having trouble engaging the 4wheel drive. I took it four wheelin a few weeks ago and had no troubles but took it out on the sand and it went out. Ive got ADD 4wheel drive, so I can be in the cab and shift it into and out of 4wheel drive rather than manually locking the hubs.

I tried engaging 4wheel drive and blew the EFI fuse in the engine bay. I replaced the fuse and with the 4wheel drive still in gear, blew the fuse again. I took it out of 4wheel drive and the fuse was fine, didnt blow this time.

Ive read that I should check the vacuum lines being that ADD is run though them but Ive got no idea where they are or where to look for them. Anyone have any ideas as to what I should check to get this working, Id hate to take it to a shop to have vacuum lines fixed..thanks.

-Jeremy

Last edited by eternalistic; 09-12-2005 at 08:17 AM.
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Old 09-12-2005, 08:30 AM
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Most everything you need to know about the ADD system:
http://www.off-road.com/toyota/tech/add/index.htm
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Old 09-12-2005, 08:42 AM
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Great, thank you very much. Ill read it over.
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