[Crazy4Power]

Hi,

Is there is any better way to check the AWD functionality of XUV.

To check this I had lifted all 4 wheels of xuv on a lift; 3 wheels were rotating, where as the front driver side wheel was not rotating.

The explanation given by workshop guys is that since the right hand side transaxle is small; it is not offering any friction & the torque is getting transferred to the left front wheel; what you guys think, is it logical ?

Secondly is there any better way to check AWD functioning.

There is also AWD lock button given in XUV, how do I check that torque is getting transferred due to front wheel slippage (since it is on lift) or due to pushing that button; since the behaviour of all 4 wheels were same in both the situations.

Thanks!

[Jaggu]

Easiest would be to take the vehicle to a place with soft soil (sand would be ideal) and try a hard launch? You will definitely know if all the wheels are working or not. The lock is basically to lock front and rear split and not L to R split, hence you might not notice the difference when lifted.

[star_aqua]

Push that AWD lock button and take a 360° turn on tarmac with sand or lose mud spread over it. roll your windows down and you will hear wheel rubbing noise or vague steering feedback which you notice even with power steering. or observe one of the front wheels, you will notice the slipping.

[Sam Kapasi]

Originally Posted by Jaggu

The lock is basically to lock front and rear split and not L to R split, hence you might not notice the difference when lifted.

Originally Posted by star_aqua

take a 360° turn on tarmac with sand or lose mud spread over it. roll your windows down and you will hear wheel rubbing noise or vague steering feedback which you notice even with power steering. or observe one of the front wheels, you will notice the slipping.

And do check vehicle insurance before you take all this advice. Or you can simply assume that it really has 4WD because it says it does.

Car freaks *rolling eyes*. What's next? Checking to see if the airbags are really there?

I'm kidding of course.

[anandpadhye]

WHen you lift the vehicle, all the 4 wheels should rotate, I checked the same when I bought the Tucson. I am not sure why the front right wheel should not rotate, I think you should check that.

Also, if you ask the technician to disconnect the front wheel speed sensor, the 4WD would stop functioning and the rear wheels will not rotate even if on the lift - happened with my Tucson.

Another possible way could be (and this I have not tried) - I have seen and read about dyno testing equipment - if you place ONLY the front wheels on the dyno, the vehicle will not move forward unless it has 4WD, I guess (again, anyone who has actual experience with the dyno can correct me if I am wrong). May be you can try a 4WD dyno if that's available.

[Blue Thunder]

^^^
Tucson --> 4WD
XUV --> AWD

the same steps as described by you may not be applicable.

[anandpadhye]

Originally Posted by Blue Thunder

^^^
Tucson --> 4WD
XUV --> AWD

the same steps as described by you may not be applicable.

Acronyms may differ, the underlying mechanicals may be similar. And even if there is a difference in the way power is transmitted to the rear, activation principle may be same (i.e. detection of loss of traction at the front wheels).

[SS-Traveller]

Originally Posted by Crazy4Power

Is there is any better way to check the AWD functionality of XUV.

To check this I had lifted all 4 wheels of xuv on a lift; 3 wheels were rotating, where as the front driver side wheel was not rotating.

Not an impossible thing to happen, because of some extra drag on brake of one side.

Originally Posted by Crazy4Power

The explanation given by workshop guys is that since the right hand side transaxle is small; it is not offering any friction & the torque is getting transferred to the left front wheel; what you guys think, is it logical ?

Huh?? Sounds like gibberish. If the drive shaft of one side is smaller, that won't change anything. Unless the CV joint on that side is faulty/tighter than the other side.

Originally Posted by Crazy4Power

Secondly is there any better way to check AWD functioning.

As described before, place the front wheels on rollers, and when the drive transfer happens to the rear wheels through the electronically actuated clutch pack (after the front wheels spin a little), the vehicle will push itself off the rollers.

Originally Posted by Crazy4Power

There is also AWD lock button given in XUV, how do I check that torque is getting transferred due to front wheel slippage (since it is on lift) or due to pushing that button; since the behaviour of all 4 wheels were same in both the situations.

With AWD lock engaged, the vehicle will push itself off the rollers instantly without waiting for front wheels to spin, as soon as you let out the clutch. The 4wd / AWD lock automatically disengages electronically and the vehicle comes back to front wheel drive mode after reaching a certain speed (IIRC 40 km/h).

Remember that the XUV500 is primarily a front wheel drive vehicle with part-time torque/drive transfer to the rear wheels with electronic control, through a clutch pack (aka on-demand 4wd system). Systems based on similar principles exist in the Tucson / Santa Fe. More info here.

[dadu]

To actually test it, you will need something like this inclined test bench, watch the Video.

All ALL WHEEL DRIVES are NOT created equal. (Subaru Vs Other - YouTube

[Crazy4Power]

Originally Posted by SS-Traveller

Not an impossible thing to happen, because of some extra drag on brake of one side.

I think this could be the probable reason, as the wheel was trying to move but some kind of breaking was stopping it from moving, it was jamming & momentarily release kind of situation.

I don't know whether this is a problem or the sensors are doing there job

[Guna]

Originally Posted by Crazy4Power

To check this I had lifted all 4 wheels of xuv on a lift; 3 wheels were rotating, where as the front driver side wheel was not rotating.

The explanation given by workshop guys is that since the right hand side transaxle is small; it is not offering any friction & the torque is getting transferred to the left front wheel; what you guys think, is it logical ?

It is quite possible, if the unequal length transaxle can cause torque steer, even this can happen.

[Sutripta]

IIRC, power for the rear is taken from a shaft which is concentric with the front right shaft.
Front left and right drags are likely to be different.

Same experiment as before. Stop the front left. Right should start rotating.

AWD: The rear propshaft should always be powered. So the question is, is the rear clutch engaging or not. Logically (but I don't know), the handbrakes should work on the rear wheels. If so, repeat your experiment, and apply the handbrake. At least one of the rear wheels should continue to turn.

It might be advantageous to connect a telltale to the rear clutch power line. That way, if the electronics are too clever and disengages the clutch, you'll know.

Regards
Sutripta

[DirtyDan]

Originally Posted by Sutripta

Same experiment as before. Stop the front left. Right should start rotating.

Yeah I agree. If the wheel has holes in it, slowly rotate the wheel with an iron bar thru the hole so that the chasis stops the wheel from rotating. The other wheel should then rotate.


The test to see whether there really is a Sam Kapasi is a bit more complex but very fulfilling when the test comes back negative.

[Crazy4Power]

Originally Posted by Sutripta

Same experiment as before. Stop the front left. Right should start rotating.

Yes I tried that also, I applied some force on left tire with my shoe shole, the right tire started rotating. But I wanted all 4 to rotate as the car was on the lift.

Thanks!

[Blue Thunder]

Originally Posted by Sutripta

..AWD: The rear propshaft should always be powered. ..

I have read about some AWD vehicles where the default drive is to the front wheels, the rear wheels are powered as required, and may not be connected all the time.