To start with, there is NO problem in the 4WD. My problem consists of no dash light when 4WD is engaged. I have taken the instrument cluster out( It's still out) and checked the bulb, it is fine! I have taken apart about every electrical connection on truck( inside and outside) on transfer case/transmission and cleaned with electric connection spray cleaner.
I have automatic locking hubs, I have checked all the vacuum hoses that I can see and they seem to be all connected, and as I said before--the 4wd works in all positions. Is their a relay or an easier way to find this problem? When I first got this truck, it worked fine and If I remember correctly I did something to the steering column( took it apart) and a week or so later I remember when locking 4WD in, I noticed the lights didn't come on any longer in my dash. Honestly, I just do not see what I could have unplugged or messed up by this? I guss if anyone can lead me in the right direction, I do have an OHM meter but do not know how to read it except by continuity. If there is a relay or fuse link and if you can be specific of where the wires are located under my truck I might be able to read with a test light if I purchase one. Just not real sure which wires do what???????? HELP if possible, and is there any diagram or pictures of troubleshooting this problem?
I have the same problem with my 4WD light but I have manual locking hubs and an automatic. Haven't found a solution yet but still looking. If you find one before I do please post and I'll do the same!! Good luck!!
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94 Toyota PK Ex-Cab 3.0 4X4 Auto
Please pardon my tactless response, but I think the biggest clue for solving your problem is:
"I did something to the steering column( took it apart) and a week or so later I remember when locking 4WD in, I noticed the lights didn't come on any longer in my dash".
I know that is is very easy to over-analyze the problem or assume that you did everything right when you took the steering column apart, but the most likely answer to your problem is normally the most simple.
Be very suspicious of elctrical connectors: You would think that if you disconnect an electrical connection, and then plug it back together, that it shouldmake a good connection. Sometimes just disturbing an electrical connector will cause problems. The metal contacts may have oxidized, causing a poor connection when you reconnected just slightly different than it was connected before. Also check that the actual metal connectors, that are supposed to be captive within the plastic connector body, did not "back-out" of the plastic body
I recommend that you do this first: Whichever connectors you disturbed, inspect, disconnect, reconnect and inspect again several times to insure a good connection - I'll bet dimes to donuts that this fixes your problem.
Hey Dirty,I know you said 4wd is fine,but did you check the vacuum cannister for it that is located under the passenger side front fender?if it has a pinhole or something maybe the light won't come on because of the small vacuum leak..I had to replace mine,just another thing for you to troubleshoot.good luck
Burger, this may be my answer! What in the hell does this vacuum do? I have not messed w/ it nor did I even know what to check out!! where and what does this little booger do? what lines go to what and could this canister be clogged? This is a whole lotta info--you the man BURGER!!!
You say the 4WD works. Do you know for a fact that the front axle engages when you move the lever?
There is a fuse that could be blown. There are also about four connectors that could be loose.
You say you have automatic hubs. I'm guessing you have ADD, which is what my '94 T100 has. When you engage the 4WD a relay (the ADD control relay) activates a device that uses the vacuum to engage the front axle. A switch then closes the curcuit to turn on the 4WD light. If your front axle is engaging, the fuse is ok and some of the connectors are ok.
Verify your front axle is engaging. If it is not, check the 10A Gauge fuse. If that does not fis it and your connectors are tight, let us know and we can work from there.
Hey REB, where is this 10 GA fuse? under driver's side panel or under hood? I Have yet to find a fuse-Thanks Sorry to respond late --been 4wheelin' in West Virginia all weekend!!! Dirty
I'm not sure where the fuse is. I got the info from my '94 T100 factory shop manual. Your truck should be the same. The terminology is quoted from the schematic diagram. I would think that the fuse would be labeled the same in the fuse box.
BTW, if your front axle is not engaging the most likely failure is probably a vacuum problem. Leaky hose, cannister, actuator or whatever. Most of us look for electrical problems first.
Now Reb, this may sound STUPID, but here I go anyway-- If my 4WD works in all positions and gets me out and through any jams I maybe in, I would think the front axle is engaging, I am in NO means a master mechanic, but help me out here how or what to look for when engaging will the axle itself move forward?
I sure wish you knew where this so called 10 ga fuse is, I have checked both fuse boxes( Driver's side panel and outside under hood) nothing blown!! Thanks and don't give up on me yet, I really APPRECIATE your help!! Bruce(Dirtybeerguy)
I'm not calling you stupid. I learned long ago in troubleshooting problems it sometimes helps to question all the evidence. I have been fooled myself, thinking the front axle was engaged when it wasn't and the truck got out of a hole. Sometimes we don't need 4WD as often as we think. That is why I questioned whether your front axle was engaged. My point is if we can verify this point, we will know where to look next.
One way to see if the front axle is engaging is to move the 4WD lever to 4WD and move the truck a bit to give things time to align and engage. Then turn the truck off before shifting the 4WD lever to neutral or 2WD. Crawl underneath and try to rotate the front driveshaft. If it rotates, the front axle is not engaged. A simpler way is to see if you can spin a front tire in sand or other soft surface.
In my T100 the Gauge fuse is under the driver's side kick panel. There is a group of 9 fuses, with three more off to the side. The Gauge fuse is the one in the center of the group of nine.
Let's say the front axle is engaging, the light is not working, and all connectors and wires are ok. Then I would suspect either the ADD indicator switch, which should be on the actuator on the axle.
If it is not engaging and the fuse and all connectors are ok, then I would suspect a vacuum leak, a vacuum actuator, the ADD control relay or the 4WD switch on the transfer case.
Check this stuff out and let us know how it goes. Good luck.
Reb,
Bigguy I knew you were not calling me "Stupid", Hell I'll call myself a dumb-a$#@!!(Ha-Ha) Anyways this is besides the point, Alright I know for sure the axle does not turn once the 4WD lever is activated, so this is eliminated, now my center guage fuse is operating and in working order, now here is where I get real DUMB- where and what does the vacuum actuator,ADD relay,and 4WDswitch look like and if you have time PLEASE be as specific and detailed on looks and placement of the items, heck through in a tip or two how to possibly check these and when we fix these this dang problem I'm going to drive out Arizona and show you how pretty this green 4WD light is and let you in on some good ol' West "By GOD" Virginia 4 wheelin techniques! Not much here in this state, but guarantee you see it play on all the hills and backwoods you'd be back!!
Thanks again from your friend in the country!!DIRTY!!!!
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