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Re: X-trail's 4wd system overheating problem ?
it is incorparated in the electronic controlled coupling....
--- Wen,rob,em,rach
X-934 (c)
See my X-Trail HERE
 flying xtrail / members number / stop light decal /towbar/ driving lights/ roofracks/ |
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6/Nov/2009, 4:44 pm
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Re: X-trail's 4wd system overheating problem ?
If you are correct, then the diagram should have at least an input from the electronically controlled coupling into the 4wd/abs control unit, instead there is only an output. Also, in the schematic, shouldn't there be a temperature sensor input on the diagram?
maybe the diagram is only a basic overview of the system, and does not incorporate all the variables?
Brendan
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Brendan - X613
2004 Platinum ST Series 2
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6/Nov/2009, 5:31 pm
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Re: X-trail's 4wd system overheating problem ?
quote:
yummymummyis40 wrote:
There is a temp sensor in the rear diff , once the oil in the diff gets to a certain temp the computer shuts down the system and will not reset till the oil temp has cooled .....
Had this been the case, I wouldn't have cooked my rear diff on the dyno 
When we dismantled the rear diff at the dealer and found the oil completely burnt along with the bushes inside the diff, we didn't see any temp sensors there at all. It would have been excellent to have one there, but I reckon the xtrail rear diff is not that advanced and this feature would more likely be found in full time 4WDs.
Last edited by jalalski, 6/Nov/2009, 6:02 pm
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6/Nov/2009, 6:01 pm
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Re: X-trail's 4wd system overheating problem ?
The only way I could see this temp sensor being in the coupling is if it was a bi-metalic strip which open-circuited the 4WD solenoid when the temp was too high and then reclosed when the temp cooled down.
We can simulate this effect by just disconnecting the 4WD solenoid cable connector from the coupling and see if the 4WD light on the dash does the same thing as if it was overheated. I already know that pulling the 4WD relay does not do the same thing as the light illuminates solidly instead of flashing.
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Kev X450(c)
2003 Titanium Ti Luxury Series 1 |
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7/Nov/2009, 9:42 am
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Re: X-trail's 4wd system overheating problem ?
It'd take me too long to find it, but I am sure I read somewhere on this forum (some time ago in this or another thread) that the rear diff was deactivated by excessive current drawn to operate it - the theory being it would draw more current to operate at higher temperatures, so perhaps there is a thermistor in the circuit somewhere that picks up the higher current draw. This would also explain why some reset faster than others, and also why some X-Trails are more prone to the problem than others (variances being due to thermistor manufacturing tolerances).
Correct me if I'm mistaken!
--- Rich. X-013(c)
'04 S2 ST Auto. Nudge_roofracks_tow_tints_Lightforce_GME_BFG_TBS_home-made-bashplate_50mm-spacer-lift
Click here to see >300MB of photos and videos All For His Glory. |
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7/Nov/2009, 9:07 pm
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Re: X-trail's 4wd system overheating problem ?
I thought what caused the overheating in sand dunes was the ABS sensor overheating and not the diff, hence the previous suggestions to spray it with water. (which no one has tried as yet as I gather)
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7/Nov/2009, 9:17 pm
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Re: X-trail's 4wd system overheating problem ?
The main point Rich is that there would have to be some wiring from the thermistor in the 4WD clutch back to the 4WD/ABS controller for it to sense the temperature and switch off the current to the solenoid.
So if there is only one connector to the solenoid and it only has 2 wires then there is no thermistor.
Jalal, it was not the overheating of the ABS sensor, but a buildup of sand which meant pulses were being missed so the 4WD controller thought the wheel was spinning at a different speed and hance "calculate" that there would be heat buildup in the 4WD clutch.
Last edited by Revhead Kev, 7/Nov/2009, 9:19 pm
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Kev X450(c)
2003 Titanium Ti Luxury Series 1 |
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7/Nov/2009, 9:17 pm
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