FJ losing power while in 4WD with rear diff locked... - Page 2 - Toyota FJ Cruiser Forum
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post #11 of 25 (permalink) Old 02-07-2017, 10:14 AM Thread Starter
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Re: FJ losing power while in 4WD with rear diff locked...

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jamesepoop previously said: View Post
Sounds like you're losing traction, not power. Are you sure 4wd is engaged? Your transfer case selector might be in 4hi or 4lo but the 4wd didn't kick in yet. Sorry if that's a silly question

Yeah...no, the 4WD was definitely locked in. There was snow flying from all 4 tires.
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post #12 of 25 (permalink) Old 02-07-2017, 10:17 AM Thread Starter
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Re: FJ losing power while in 4WD with rear diff locked...

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Chains is the correct answer. Gravel may help too, but spinning the tires is seldom the right thing regardless of the terrain.

Yeah...I know...and yes, it did turn it to a sheet of ice. That's one of the things I HATE about automatics...you can't really feel when they break traction, nor can you control it very well. That said, there are times when keeping the tires spinning WILL get you from point A to point B when nothing else will.
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post #13 of 25 (permalink) Old 02-07-2017, 10:23 AM Thread Starter
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Re: FJ losing power while in 4WD with rear diff locked...

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All 4WD FJs have a locking center. Actually the AT models don't have a center diff, just a part time transfer case, which is by definition locked when in 4WD. The MT, which is FT4WD has a T3 Torsen LSD in the center, which can also be locked in high range (the locked position is 4HL) Low range is always locked.

OP - Which tires are on the vehicle? Are they MTs, HT, AT or snow/winter tires? Do they have sipes?

Also - unless you've done the "rear locker on demand" hack, the rear locker only engages in 4L. @CabinCruiser reports the locker hack is pretty useful in snow.


These are 34" Toyo MT's and they are siped. There are less than 10,000 miles on them.

I appreciate the tip on the rear locker tip. Do you have any information on this hack??? Will it void the remainder of my factory warranty?
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post #14 of 25 (permalink) Old 02-07-2017, 12:47 PM
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Re: FJ losing power while in 4WD with rear diff locked...

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If feeling power loss, especially in the high ranges, check that your VSC & TRC are disabled (orange lights on the dash) . A single short push on the VSC/TRC button will disable TRC until you reach an indicated 30mph. Hold the button down for 3 secs when stationary and it will disable both at any speed until you restart the engine or cancel with a single push.
60mph indicated in low would not be possible due to hearing. I don't think I've ever done more than 30 in 6th..
Just for the record, mine is automatic trans and does not have this button. I had to hack the system to turn it off.


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post #15 of 25 (permalink) Old 02-07-2017, 01:59 PM
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Re: FJ losing power while in 4WD with rear diff locked...

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Yeah...no, the 4WD was definitely locked in. There was snow flying from all 4 tires.
Questionable method of checking 4wd though. My MT tires kick up mud/snow/rain from the front in 2wd or 4wd. Just something to note. But the 4wd/drivetrain light was on?


@amaclach doesn't VSC shut off once 4wd is engaged? Which leads me to believe if he's slipping because of VSC or whatever, his 4wd wasn't exactly engaged.

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post #16 of 25 (permalink) Old 02-07-2017, 02:27 PM Thread Starter
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Re: FJ losing power while in 4WD with rear diff locked...

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Just for the record, mine is automatic trans and does not have this button. I had to hack the system to turn it off.

Do you by chance know where I might be able to get some information on this hack??? Thank you!
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post #17 of 25 (permalink) Old 02-07-2017, 02:33 PM
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Re: FJ losing power while in 4WD with rear diff locked...

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CabinCruiser previously said: View Post
Just for the record, mine is automatic trans and does not have this button. I had to hack the system to turn it off.
We need to know how!

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post #18 of 25 (permalink) Old 02-07-2017, 02:44 PM
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Re: FJ losing power while in 4WD with rear diff locked...

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Do you by chance know where I might be able to get some information on this hack??? Thank you!
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We need to know how!
There are 3 ways to do it:

All of this information is here in the forum if you look around a little. Use Google instead of the forum, type "FJ Cruiser Forum" + your subject matter. Hope this helps.
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post #19 of 25 (permalink) Old 02-07-2017, 04:54 PM
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Quote:
CabinCruiser previously said: View Post
Quote:
amaclach previously said: View Post
If feeling power loss, especially in the high ranges, check that your VSC & TRC are disabled (orange lights on the dash) . A single short push on the VSC/TRC button will disable TRC until you reach an indicated 30mph. Hold the button down for 3 secs when stationary and it will disable both at any speed until you restart the engine or cancel with a single push.
60mph indicated in low would not be possible due to hearing. I don't think I've ever done more than 30 in 6th..
Just for the record, mine is automatic trans and does not have this button. I had to hack the system to turn it off.
I think it's on all except some of the early ones? Anyway I don't use the factory switch anymore since I did the ABS hack switch which disables all the nannies instantly ( but still allows ATRAC). Next stop is the rear locker on demand hack, but I might put a dependence on the nannies off switch to be on for it to activate at any speed...
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post #20 of 25 (permalink) Old 02-07-2017, 09:22 PM
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Re: FJ losing power while in 4WD with rear diff locked...

So i got stuck a couple nights ago with a friend on this muddy trail and something like this happened to me. I felt like i had my pedal to the metal but I wasn't even attempting to move. I switched off the A-trac and sure enough i was able to fling some mud. I'm not 100% sure how a-trac works but i do know it "senses" slippage on one tire or another and removes power from that tire and transfers to the other. Usually these types of systems only effect the abs but this seemed to have control over the power to engine possibly transmission as well (ecm im assuming).

If you dont have a-trac, try switching off the Traction control by holding the button for 5 secs until the light pops on your dash before going into 4-lo.

Last edited by FJDooM; 02-07-2017 at 09:24 PM. Reason: clarification.
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