91 Toyota 4x4 truck won't lock in the auto locking front differential
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From: Handyman on 22 Mar 2010 01:47 've got a 1991 Toyota 4x4 truck with a 3.0 V-6 and auto locking front differential that is supposed to lock in when the transfer case is put into four wheel drive. The transfer case shifts into four wheel drive but I do not get the 4x4 light on the dash and the differential does not lock in. I've checked the vacuum hoses and the wiring and everything appears to be connected. Has anybody got any tips on how to go about troubleshooting this?
From: Anyolmouse on 22 Mar 2010 13:39 "Handyman" <sgt_az(a)yahoo.com> wrote in message news:e48b37f2-40bd-4a7c-9824-129f15a8cdd4(a)j16g2000prn.googlegroups.com... > 've got a 1991 Toyota 4x4 truck with a 3.0 V-6 and auto locking > front differential that is supposed to lock in when the transfer case > is put into four wheel drive. The transfer case shifts into four > wheel drive but I do not get the 4x4 light on the dash and the > differential does not lock in. I've checked the vacuum hoses and the > wiring and everything appears to be connected. > Has anybody got any tips on how to go about troubleshooting this? See if this helps-- http://www.off-road.com/trucks4x4/article/articleDetail.jsp?id=399612 some folks have permanently locked the ADD and installed manual or automatic hubs because of the complexity of the ADD system. -- We have met the enemy and he is us-- Pogo Anyolmouse
From: Anyolmouse on 22 Mar 2010 13:51 "Handyman" <sgt_az(a)yahoo.com> wrote in message news:e48b37f2-40bd-4a7c-9824-129f15a8cdd4(a)j16g2000prn.googlegroups.com... > 've got a 1991 Toyota 4x4 truck with a 3.0 V-6 and auto locking > front differential that is supposed to lock in when the transfer case > is put into four wheel drive. The transfer case shifts into four > wheel drive but I do not get the 4x4 light on the dash and the > differential does not lock in. I've checked the vacuum hoses and the > wiring and everything appears to be connected. > Has anybody got any tips on how to go about troubleshooting this? Here is a PDF file on the ADD Control System http://www.ncttora.com/fsm/1993/suspensionandaxle/26addcontr.pdf which is on this page in case the PDF file doesn't load. http://www.ncttora.com/fsm/1993/suspensionandaxle.html There wasn't much change between the '91 and '93 model years so the info should be good. -- A man is known by the company he keeps- Unknown Anyolmouse
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