Question about 2003 Toyota Tundra
Most likely the motor/actuator on the transfer case(most of these also contain the module). Prone to every type of condition. None I have taken apart have been waterproof.
Posted on Nov 30, 2014
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Posted on Jan 02, 2017
Does the 4wd icon on the dash blink when you try? The most common problem I have seen is the 4wd actuator sticking. Its mounted towards the rear of the transfer case on the drivers side(US). It has about a 3inch electrical plug on it. Locate it and with the truck running have someone push the 4wd button while you lightly tap on the actuator motor. They can sometimes stick from lack of use. If it doesn't free up it may need to be replaced which is rather involved. The transfer case would need to be removed and opened up to replace.
Posted on Apr 15, 2009
SOURCE: I have a 2004 toyota
Its possible the 4wd actuator on the transfer case is sticking from lack of use. Its a black plastic part located on your transfer case on the drivers side rear with a electrical connector attached. Tap on it lightly while someone activates the 4wd button. Have truck running in neutral with foot on brake. (dont get run over). If it goes into 4wd, then just remember to cycle it into 4wd and back again once or twice a month to keep it from sticking.
If all this doesn't work a dealer will need to look at it.
Posted on May 03, 2009
I pretty much have the same problem. The odds are that it isnt the transfer case at all.
That model year has an electric over vacuum control switch on the transfer case and 2 electric over vacuum switches on the passenger side front fender well near the rear by the hood hinge, they are either green or blue and made of plastic, they both have vacuum lines and 2 wires connected to them.
From there the vacuum lines run down near the front differential where they connect to a slave cylinder. the vacuum routes one way, the slave plunger moves and the differential engages 4WD, the vacuum routes the other way, the slave plunger moves again and the differential disengages 2WD (similar to a 90's model dodge 4x4).
Run this easy test. Label the vacuum lines that come from the top of the vacuum switches on the fender well (front, rear) use masking tape.
Start your truck. (make sure one of those switches has vacuum, put your finger over the nipples where you unplugged the lines, if you feel suction, you got vacuum) trade the vacuum lines, front to rear and rear to front. shift into 4x4, you wont get a 4x4 light, but if you now have 4WD then the problem is in the circuit somewhere between those 2 switches and the master switch on the T-case.
I'll post more as I go. I've been switching mine that way for a week now, because i'm too lazy to fix it in 2 feet of snow.
Posted on Jan 01, 2010
Sounds to me that your diff. actuator is bad. My 05 Sequoia was doing the same thing, except it would not come out of 4 wheel drive, I replaced the diff. actuator and everything has been fine since. It was easy to replace and not an expensive part either.
Posted on Nov 22, 2010
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