Question about 1994 Toyota 4Runner

7 Answers

4wd stopped working.

94' 4runner, v6, manual trans, 4wd. worked fine for years. having a wicked snow storm and no 4wd. does not work in H4 or L4. not 4wd light goes on. seems odd. on my jeep. it transfer lever is linked directly to the T case. Is the Toy some sort of electircal connect ? please advise, I am stuck in the middle of this without wheels.

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  • 6 more comments 
  • dkgeneralmai Dec 18, 2008

    I look at the set of shop manuals that i got from Toy years ago, i could not find any sort of diagram about the 4wd setup. One of my questions was it electrical unlike the old jeep. so where are the fuses for the 4wd ? how do i check the solenoid ?

  • dkgeneralmai Dec 18, 2008

    is that an ad ?

  • dkgeneralmai Dec 18, 2008

    if you are talking about the fuse setup under the hood, i checked that prior to posting, there isn't any 4wd fuse. is toyota Ed around ? i would like his take on it. thanks

  • dkgeneralmai Dec 18, 2008

    hey ed, thanks for the quick response. I am stuck here at a holiday inn, can't get up the mtn to the house cause of the snow. anyway, i am working on finding a tech who will look at the thing. so i use this info, if you have more steps let me know asap so i wont be going in blind. thanks again for all your help, now and in the past.

  • dkgeneralmai Dec 18, 2008

    i doubt you can see this you applied the rating....
    i dont understand ? i thought i reposted. just looking for more info for when i go in to see the tech. like what he should be looking for etc.

  • dkgeneralmai Dec 18, 2008

    tried it. does not work

  • dkgeneralmai Dec 19, 2008

    xx

  • dkgeneralmai Dec 19, 2008

    took vehicle to the tech. the actuator was stuck. tapped on it with a hammer and everything began to work. works fine now.

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7 Answers

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Its probably the actuator not working in the front diff which enagages the front diff. Unlike some other 4wd systems, the 4runner locks at the differential instead of at the hubb (hence the name ADD, automatic disconnecting differential). Put the truck in 4 wd and jack up one of the front wheels. If you can turn the wheel then you know the front diff is not engaged. Make sure you have the engine running because I belive those actuators are vaccum driven and may not work if the enginge is shut off. Once you confirm that the front diff is not engaging, you should check all the vacuum lines running to the actuator, make sure there is a vacuum, and then check the actuator itself. In rare cases, when 4wd is rarely engaged and the system is not lubed properly, the arm which the actuator pushes gets seized, therefore the actuator is unable to push it. You may have to open the diff to get at all the parts. Good luck.

Posted on Dec 19, 2008

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DK- When you apply the rating; this usually terminates the expert that you were looking at. Try this:
1) Tap on the instrument panel; key ON/i4WD selected. The 4WD will not work if the bulb is burned out. Tapping on the cluster may "weld" the contacts back together. If no joy,
2.) Open the hood; look for loose vacuum hoses at the 2 vacuum solenoids on the lower passengfer side inner fender. Make sure that there is no moisture under the wiring connectores. The 4WD-ADD solenoid has a PINK with a GREEN tracer, the 2WD-ADD solenoid has a solid LIGHT GREEN WIRE.
3.) Open the fuse box under the hood. Key ON/4WD selected, unplug and replug the A.D.D. relay. See if it clicks. Comment posted on Dec 18, 2008 Stupid premium system.
This guy needs help, I can provide it, and he cannot see my input.
What is wrong with this picture? Comment posted on Dec 18, 2008 DK- When you apply the rating; this usually terminates the expert that you were looking at. Try this:
1) Tap on the instrument panel; key ON/i4WD selected. The 4WD will not work if the bulb is burned out. Tapping on the cluster may "weld" the contacts back together. If no joy,
2.) Open the hood; look for loose vacuum hoses at the 2 vacuum solenoids on the lower passengfer side inner fender. Make sure that there is no moisture under the wiring connectores. The 4WD-ADD solenoid has a PINK with a GREEN tracer, the 2WD-ADD solenoid has a solid LIGHT GREEN WIRE.
3.) Open the fuse box under the hood. Key ON/4WD selected, unplug and replug the A.D.D. relay. See if it clicks. THIS IS TOYOTA EDS RESPONSE TO YOU DONT KNOW IF YOU COULD SEE IT.SINCE YOU RATED SOLUTION SOMETIMES YOU WONT SEE COMMENTS CHECK YOUR VACUUM LINES SEE IF YOU SEE SOMETHING OFF. I WOULD LEAN MORE TOWARD ELECTRICAL SINCE IT WONT EVEN GO IN LO RANGE

Posted on Dec 18, 2008

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Look for a relay that controls the 4wd... it should be either under the dash or in a fuse panel in the engine compartment... replace it.

Robert

Posted on Dec 18, 2008

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Start the vehicle and then put your foot on the BRAKE and put vehicle in NEUTRAL. Then engage 4x4. It should work.

Posted on Dec 18, 2008

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  • Toyota Master
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Glad to help. Thanks for asking for me! I am honoured!
The 4WD system is electro/mechanical AND vacuum assisted.
Lets start with a quick look at the electric part; and then do some diagnosis:
...Power for the 4WD comes from the 10 amp gauge fuse;
there is NO "4WD" fuse.
After that, everything else is dependent on grounds.
(A.D.D. stands for Automatic Disconnect Device)
POWER FLOW is as follows:
10 amp gauge fuse -> 4WD indicator -> A.D.D. short pin -> A.D.D. detection switch -> Indicator switch for MT transfer case -> GROUND
10 amp gauge fuse -> A.D.D. control relay -> VSV 4WD/ADD + VSV 2WD/ADD -> GROUND
First, look for 12 VDC at the A.D.D. relay pins 1 and 6, with the relay out/key on.
Advise me of your results. Note: if you terminate this interaction by applying a rating, you will no longer see any further posts on this subject; this is how this system is designed; 1 solution at a time.

Posted on Dec 18, 2008

  • 3 more comments 
  • Toyota Ed Dec 18, 2008

    I doubt that you can see this, you applied the rating!

  • Toyota Ed Dec 18, 2008

    DK- When you apply the rating; this usually terminates the expert that you were looking at. Try this:

    1) Tap on the instrument panel; key ON/i4WD selected. The 4WD will not work if the bulb is burned out. Tapping on the cluster may "weld" the contacts back together. If no joy,

    2.) Open the hood; look for loose vacuum hoses at the 2 vacuum solenoids on the lower passengfer side inner fender. Make sure that there is no moisture under the wiring connectores. The 4WD-ADD solenoid has a PINK with a GREEN tracer, the 2WD-ADD solenoid has a solid LIGHT GREEN WIRE.

    3.) Open the fuse box under the hood. Key ON/4WD selected, unplug and replug the A.D.D. relay. See if it clicks.

  • Toyota Ed Dec 18, 2008

    Stupid premium system.

    This guy needs help, I can provide it, and he cannot see my input.

    What is wrong with this picture?

  • Toyota Ed Dec 18, 2008

    DK- When you apply the rating; this usually terminates the expert that you were looking at. Try this:
    1) Tap on the instrument panel; key ON/i4WD selected. The 4WD will not work if the bulb is burned out. Tapping on the cluster may "weld" the contacts back together. If no joy,
    2.) Open the hood; look for loose vacuum hoses at the 2 vacuum solenoids on the lower passengfer side inner fender. Make sure that there is no moisture under the wiring connectores. The 4WD-ADD solenoid has a PINK with a GREEN tracer, the 2WD-ADD solenoid has a solid LIGHT GREEN WIRE.
    3.) Open the fuse box under the hood. Key ON/4WD selected, unplug and replug the A.D.D. relay. See if it clicks.

  • Toyota Ed Dec 19, 2008

    Thanks, TA! Owe you one.

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The best advise than me can be given by the site www.autoshop101.com.i think they can help you.thank you

Posted on Dec 18, 2008

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  • Expert
  • 247 Answers

Welcome to fixya-

It sounds like the shift selonoid is bad. It is located on the side on the transfer case. it is a simple fix. Did you check your fuses to make sure they ok? if so then you could also have a bad 4x4 computer.

Posted on Dec 18, 2008

  • Thomas Dec 18, 2008

    the fuses for the 4x4 will be with the rest of the fuses. and the shift selonoid is located on the side of the transfer case, the front drive axle hooks up next it and the only thing i know you can do about them is replace them. but if you have the vehicle with the key on engine off and try to switch the 4x4 it and out by pushing the buttons on the dash then the selonoid is ok.

  • Thomas Dec 18, 2008

    is the 4wd a button or stick activation? if it is push button the have the relays checked a long with the shift selonoid on the transfer case. and if it is stick then the issue lies within the transfer case its self. hope what has been given to you helps and i think you could give me a better rating for all the help i have give you.



    thanks Tom

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