02-19-2014, 11:18 AM
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#1
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2002 4runner no 4WD.
Yes another one with no 4WD and flashing lights on the dash. I assume the actuator is only used in 4Hi, and moving the leave to 4LO would bypass the actuator as I manually engaged it in 4WD but LO. Still no 4WD, so I would assume this means the front diff to be the problem?
Thoughts?
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02-19-2014, 12:21 PM
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#2
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Quote:
Originally Posted by BOSSIND
Yes another one with no 4WD and flashing lights on the dash. I assume the actuator is only used in 4Hi, and moving the leave to 4LO would bypass the actuator as I manually engaged it in 4WD but LO. Still no 4WD, so I would assume this means the front diff to be the problem?
Thoughts?
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In a 2002, there are two actuators, both electric, not vacuum like the rest of us--so a lot of what you read won't apply to you. One is on the TC and engages 4wd, i.e. the front propeller shaft for either 4Hi or 4Lo. The other is on the front diff and engages for both 4Hi and 4Lo.
The good news (for you) is the on-line FSM applies to you and not to the rest of us. I'm a 5-speed J-shift guy so I can't help much other than by looking at the manual. Look at what you get:
__________________
'99 4Runner SR5 5spd 3.4L V6 4WD(U.S), original '99 Talls in front, OME 906s in back, Hella fogs, Trekmaster shocks in front, Billy in back, no running boards, FIAMM horns, Alpine sound, Michelin LTX M/S2's, owned since new.
'97 HiLux SW4 5spd 4WD(Japan model bought in Brazil assembled in Argentina, very close to a 3.0 4Runner/Surf)
'71 FordWillys Jeep CJ5 (with straight six Ford Maverick 3.0 liter engine--lives in the mountains north of Sao Paulo Brazil)
My Backyard Frame Swap
Last edited by TheDurk; 02-19-2014 at 12:24 PM.
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02-19-2014, 01:03 PM
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#3
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Quote:
Originally Posted by TheDurk
In a 2002, there are two actuators, both electric, not vacuum like the rest of us--so a lot of what you read won't apply to you. One is on the TC and engages 4wd, i.e. the front propeller shaft for either 4Hi or 4Lo. The other is on the front diff and engages for both 4Hi and 4Lo.
The good news (for you) is the on-line FSM applies to you and not to the rest of us. I'm a 5-speed J-shift guy so I can't help much other than by looking at the manual. Look at what you get:
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Thanks those PDFs are great.
So if my thinking is right by manually placing it in 4wd low, its the actuator on the from diff thats acting up, because I don't have 4wd in lo.
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02-19-2014, 02:43 PM
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#4
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Quote:
Originally Posted by BOSSIND
Thanks those PDFs are great.
So if my thinking is right by manually placing it in 4wd low, its the actuator on the from diff thats acting up, because I don't have 4wd in lo.
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I'm sorry, I just don't really understand the specifics of your trouble description. But, if the actuator works at all, i.e. in 4H, your problem is likely in the control system. It sound as if you need to look at the 4L sending switch on the TC (D4 on the wire diagram). It's probably not telling the system that 4L is engaged and the front needs to lock up. So the front actuator never gets called.
__________________
'99 4Runner SR5 5spd 3.4L V6 4WD(U.S), original '99 Talls in front, OME 906s in back, Hella fogs, Trekmaster shocks in front, Billy in back, no running boards, FIAMM horns, Alpine sound, Michelin LTX M/S2's, owned since new.
'97 HiLux SW4 5spd 4WD(Japan model bought in Brazil assembled in Argentina, very close to a 3.0 4Runner/Surf)
'71 FordWillys Jeep CJ5 (with straight six Ford Maverick 3.0 liter engine--lives in the mountains north of Sao Paulo Brazil)
My Backyard Frame Swap
Last edited by TheDurk; 02-19-2014 at 02:45 PM.
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02-19-2014, 04:30 PM
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#5
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Quote:
Originally Posted by TheDurk
I'm sorry, I just don't really understand the specifics of your trouble description. But, if the actuator works at all, i.e. in 4H, your problem is likely in the control system. It sound as if you need to look at the 4L sending switch on the TC (D4 on the wire diagram). It's probably not telling the system that 4L is engaged and the front needs to lock up. So the front actuator never gets called.
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What I'm saying is, 4L is a manual mechanical engagement of 4wd. So it doesn't matter if the actuator on the T Case is working or not, I should be driving power down the front driveshaft as a result of me manually and mechanically doing so. However the fact I still have no 4wd would be an indicator that the problem lies in the front axle or the actuator on the front axle as that one I can't manually over ride it.
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02-19-2014, 06:27 PM
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#6
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Quote:
Originally Posted by BOSSIND
However the fact I still have no 4wd would be an indicator that the problem lies in the front axle or the actuator on the front axle as that one I can't manually over ride it.
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Although you have mechanical coupling to the front diff, what Dirk is saying is, your transfer case has to tell the front diff actuator it has been placed in low mode.
It does this via a switch on the xfer case itself.
If the front diff don't know the transfer case is driving it's crown and pinion, it will not apply the proper coupling to the front wheels.
BTW- Dirk...Thanks for those diagrams. They are almost exactly what I needed to put this whole system together on a logical order of operation. I've saved them to my growing "Toy" file.
Last edited by Grenvilleter; 02-19-2014 at 07:33 PM.
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02-19-2014, 06:53 PM
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#7
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If it's not going into 4wd at all and you haven't used it in a long time try this:
http://www.toyota-4runner.org/showthread.php?t=158472
It's a free fix that worked for me, if it doesn't, you're not out anything.
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02-19-2014, 10:54 PM
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#8
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Quote:
Originally Posted by Brique
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I live in Canada, I use it all the time. 
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02-19-2014, 11:01 PM
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#9
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Quote:
Originally Posted by Grenvilleter
Although you have mechanical coupling to the front diff, what Dirk is saying is, your transfer case has to tell the front diff actuator it has been placed in low mode.
It does this via a switch on the xfer case itself.
If the front diff don't know the transfer case is driving it's crown and pinion, it will not apply the proper coupling to the front wheels.
BTW- Dirk...Thanks for those diagrams. They are almost exactly what I needed to put this whole system together on a logical order of operation. I've saved them to my growing "Toy" file.
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I put it on the hoist tonight and did some testing, in 4Lo the driveshaft still turns freely along with the right tire. Do you have knowledge the T-case tells the front actuator to lock, or is that just your thinking on it? I assume when you hit the switch, the 4WD computer tell both actuators to engage at the same time. I don't know as I've only scratched the surface, I'll be tearing into it this Saturday so I'll have a much better ideal on how this system works.
Thanks.
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02-19-2014, 11:38 PM
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#10
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Quote:
Originally Posted by BOSSIND
I put it on the hoist tonight and did some testing, in 4Lo the driveshaft still turns freely along with the right tire. Do you have knowledge the T-case tells the front actuator to lock, or is that just your thinking on it? I assume when you hit the switch, the 4WD computer tell both actuators to engage at the same time. I don't know as I've only scratched the surface, I'll be tearing into it this Saturday so I'll have a much better ideal on how this system works.
Thanks.
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What tire..front or rear? what driveshaft?
The transfer case switch sure affected the operation on mine but it's a '97.
As TheDurk says...your lucky the FSM manual he provided was made for your model.
Mine uses VSV's and vacuum actuators and I don't have a center locking diff so it could be completely different.
Let us know how it turns out this weekend.
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02-20-2014, 01:31 AM
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#11
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Quote:
Originally Posted by BOSSIND
I put it on the hoist tonight and did some testing, in 4Lo the driveshaft still turns freely along with the right tire. Do you have knowledge the T-case tells the front actuator to lock, or is that just your thinking on it? I assume when you hit the switch, the 4WD computer tell both actuators to engage at the same time. I don't know as I've only scratched the surface, I'll be tearing into it this Saturday so I'll have a much better ideal on how this system works.
Thanks.
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You're wrong and he's right. T-case tells the front to lock via the 4wd ECU. Then front tells the light to go on. It's not spelled out in the stuff I posted, but the vacuum systems all worked that way, and I strongly doubt they changed that logic just because they went to an electric actuator.
__________________
'99 4Runner SR5 5spd 3.4L V6 4WD(U.S), original '99 Talls in front, OME 906s in back, Hella fogs, Trekmaster shocks in front, Billy in back, no running boards, FIAMM horns, Alpine sound, Michelin LTX M/S2's, owned since new.
'97 HiLux SW4 5spd 4WD(Japan model bought in Brazil assembled in Argentina, very close to a 3.0 4Runner/Surf)
'71 FordWillys Jeep CJ5 (with straight six Ford Maverick 3.0 liter engine--lives in the mountains north of Sao Paulo Brazil)
My Backyard Frame Swap
Last edited by TheDurk; 02-20-2014 at 01:40 AM.
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02-20-2014, 08:59 AM
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#12
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Quote:
Originally Posted by Grenvilleter
What tire..front or rear? what driveshaft?
The transfer case switch sure affected the operation on mine but it's a '97.
As TheDurk says...your lucky the FSM manual he provided was made for your model.
Mine uses VSV's and vacuum actuators and I don't have a center locking diff so it could be completely different.
Let us know how it turns out this weekend.
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Sorry I thought it was obvious, the front driveshaft.
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02-20-2014, 09:01 AM
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#13
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Quote:
Originally Posted by TheDurk
You're wrong and he's right. T-case tells the front to lock via the 4wd ECU. Then front tells the light to go on. It's not spelled out in the stuff I posted, but the vacuum systems all worked that way, and I strongly doubt they changed that logic just because they went to an electric actuator.
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I wasn't saying anyone was right or wrong, nice for you to draw the line.
From what I can tell the sensors for reporting back to the computer are on the actuator on the T case.
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02-20-2014, 12:23 PM
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#14
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Quote:
Originally Posted by BOSSIND
I wasn't saying anyone was right or wrong, nice for you to draw the line.
From what I can tell the sensors for reporting back to the computer are on the actuator on the T case.
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Don't get your panties in a bunch. You stated an assumption. It was wrong, I corrected it. This is what we do here.
You need to carry out the procedure on page TR-52 in the second link I posted. I'm pretty sure it will fail on one or more tests.
This is the best info I have about where the switches are on the 2002. Diagram pretty much sucks and the description by No. 1, No. 2, etc, doesn't match up to the FSM or the wire diagram. Sorry, best I can do. Someone who has worked on one of these could be better able to help.
__________________
'99 4Runner SR5 5spd 3.4L V6 4WD(U.S), original '99 Talls in front, OME 906s in back, Hella fogs, Trekmaster shocks in front, Billy in back, no running boards, FIAMM horns, Alpine sound, Michelin LTX M/S2's, owned since new.
'97 HiLux SW4 5spd 4WD(Japan model bought in Brazil assembled in Argentina, very close to a 3.0 4Runner/Surf)
'71 FordWillys Jeep CJ5 (with straight six Ford Maverick 3.0 liter engine--lives in the mountains north of Sao Paulo Brazil)
My Backyard Frame Swap
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02-20-2014, 01:11 PM
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#15
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Quote:
Originally Posted by TheDurk
Don't get your panties in a bunch. You stated an assumption. It was wrong, I corrected it. This is what we do here.
You need to carry out the procedure on page TR-52 in the second link I posted. I'm pretty sure it will fail on one or more tests.
This is the best info I have about where the switches are on the 2002. Diagram pretty much sucks and the description by No. 1, No. 2, etc, doesn't match up to the FSM or the wire diagram. Sorry, best I can do. Someone who has worked on one of these could be better able to help.
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Don't be talking about my Panties till we get to know each other a little better.
Thanks, I know I have to run through the procedure and will do so Saturday, just trying to arm myself with information and rule out things or at least narrow it down to some knowns. Thanks for the part numbers.
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