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Auto-Lsd Light Will Not Go Off! Why?

chrisdicko23
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PM-R33 Grand Master

PM-R33

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First up it is Active not Auto.

Have a quick read of this first so you know a bit about the diff:

http://www.skylinesaustralia.com/forums/topic/268134-r33-gtst-active-lsd-information/

Now for the A-LSD light to be constantly on, it means it is not working. Therefore the diff is open wheeling all the time.

What have you done to the car recently? Any mods? Is your HICAS light on aswell?

First thing check that the resevoir in the boot has fluid in it.

Second check that something hasn't snagged on the wiring for the diff pumps and unplugged them (it is directly underneath the resevoir behind the drivers side rear wheel).

Go from there.

chrisdicko23 Community Regular

chrisdicko23

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  • Author
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First up it is Active not Auto.

Have a quick read of this first so you know a bit about the diff:

http://www.skylinesa...sd-information/

Now for the A-LSD light to be constantly on, it means it is not working. Therefore the diff is open wheeling all the time.

What have you done to the car recently? Any mods? Is your HICAS light on aswell?

First thing check that the resevoir in the boot has fluid in it.

Second check that something hasn't snagged on the wiring for the diff pumps and unplugged them (it is directly underneath the resevoir behind the drivers side rear wheel).

Go from there.

Ah yes active lsd :P my mistake. well today i took off my exhaust and knocked out my cat and stuck it back up. took it for a drive and ran all sweet! then had the centre console behind gear shift out to put a wire through for my phone. also fed some wires along the body under the carpet on the left and right of car. nothing serious, but where abouts does the wire for the active lsd lead? i did however notice that there was a small leak from in front of the back left hand tyre coming somewhere from the chassis. once i had seen the active lsd light on i turned the car off while driving thinking it would just reset and when i started the car up again while still moving the hicas light came on aswell as the active lsd. stopped turned car off n back on then back to the active lsd problem. so not sure whats happening.

Thanks again for the help mate! been really helpful! :D

PM-R33 Grand Master

PM-R33

Posted
Posted

Righteo if HICAS light and A-LSD light came on it means it's an electrical problem. Given that you said you played around with some wires I dare say you either shorted something out without realising it or accidentelly cut a wire.

When the HICAS light came on you lost power steering aswell?

Sounds like you may have damaged the speed signal wire or the TPS wire or something like that.

chrisdicko23 Community Regular

chrisdicko23

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Righteo if HICAS light and A-LSD light came on it means it's an electrical problem. Given that you said you played around with some wires I dare say you either shorted something out without realising it or accidentelly cut a wire.

When the HICAS light came on you lost power steering aswell?

Sounds like you may have damaged the speed signal wire or the TPS wire or something like that.

No did not lose power steering, to be honest the car feels fine when it drives.. but the hicas only came on when i started the car up traveling at 70 then went off when i did standstill start. so dont think its that. im thinking that i might have hit a wire.. but not sure where it would be.

PM-R33 Grand Master

PM-R33

Posted
Posted

Strange. When the HICAS gets an error and the light comes on your steering usually goes heavy due to it being wired up together.

The diff you won't really notice other than trying to put power down, will throw all power to one wheel (easy test to do a burnout).

Try disconnecting your battery for a little while and then connecting it back up. It resets any error codes that may be stored (like from shorting out a wire) and can sometimes return everything to normal.

chrisdicko23 Community Regular

chrisdicko23

Posted
  • Author
Posted

Strange. When the HICAS gets an error and the light comes on your steering usually goes heavy due to it being wired up together.

The diff you won't really notice other than trying to put power down, will throw all power to one wheel (easy test to do a burnout).

Try disconnecting your battery for a little while and then connecting it back up. It resets any error codes that may be stored (like from shorting out a wire) and can sometimes return everything to normal.

Yes im thinking that this could be a computer malfunction and a reset could fix the problem. i will give that a go tomorrow and let you know how it goes! cheers

chrisdicko23 Community Regular

chrisdicko23

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I had the negative off the battery for about 30 mins and retried then still had the same problem. should i do it longer? also i decided to retrace my steps from yesterday when i installed some wires making sure nothing was cut or removed. i could not see anything odd but once i had put the car back together i turned her on and it just went away! but started driving and bang back on! i can easily get the car sideways and it appears that the active lsd is functioning, so maybe i have lost a negative wire somewhere?

chrisdicko23 Community Regular

chrisdicko23

Posted
  • Author
Posted

Strange. When the HICAS gets an error and the light comes on your steering usually goes heavy due to it being wired up together.

The diff you won't really notice other than trying to put power down, will throw all power to one wheel (easy test to do a burnout).

Try disconnecting your battery for a little while and then connecting it back up. It resets any error codes that may be stored (like from shorting out a wire) and can sometimes return everything to normal.

i had the negative off the battery for about 30 mins and reconnevted and retried then still had the same problem. should i do it longer? also i decided to retrace my steps from yesterday when i installed some wires making sure nothing was cut or removed. i could not see anything odd but once i had put the car back together i turned her on and it just went away! but started driving and bang back on! i can easily get the car sideways and it appears that the active lsd is functioning, so maybe i have lost a negative wire somewhere?

PM-R33 Grand Master

PM-R33

Posted
Posted

If the light is on, you have no LSD action. Simple as that.

Under normal operation when one wheel loses traction the diff locks up to send power to the other wheel to gain traction. That's how it works in a nutshell (it is a bit more complicated than that).

So if the light is on it means there is an error and the diff will not activate. Meaning once one wheel loses traction all power will go to that wheel (referred to as a single spinner). Has nothing to do with being able to get the car sideways or not. If anything it will allow it to get sideways easier as it will kick to one side (usually the back left will break lose).

If you disconnected the battery and the light still comes on afterwards it means the error is still there and wasn't simply something that could be wiped.

Did you check that there was fluid in the resevoir in the boot and did you check that the pumps underneath the car havn't had the plugs come out of them like I said in my first post?

chrisdicko23 Community Regular

chrisdicko23

Posted
  • Author
Posted

If the light is on, you have no LSD action. Simple as that.

Under normal operation when one wheel loses traction the diff locks up to send power to the other wheel to gain traction. That's how it works in a nutshell (it is a bit more complicated than that).

So if the light is on it means there is an error and the diff will not activate. Meaning once one wheel loses traction all power will go to that wheel (referred to as a single spinner). Has nothing to do with being able to get the car sideways or not. If anything it will allow it to get sideways easier as it will kick to one side (usually the back left will break lose).

If you disconnected the battery and the light still comes on afterwards it means the error is still there and wasn't simply something that could be wiped.

Did you check that there was fluid in the resevoir in the boot and did you check that the pumps underneath the car havn't had the plugs come out of them like I said in my first post?

Ohh i see, yeah that makes a lot more sense now! with the resevoir it is actually a bit above the maximum line but the fluid has a top layer of a brown sort of colour. not sure if its ok or not? as for the wires underneath, i couldnt see anything visible, but im going to jack the back up tomorrow and have a better look!

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