ASC issue

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ASC issue

Postby ashsut on Fri Oct 05, 2018 8:00 pm

Hey guys,

I searched around the forum a bit and couldn't find anyone with a similar issue on an MQ so here goes:

Had my 2017 GLS MQ since new, 20k on the clock so far.

For a few weeks now the car's ASC (I think) has been cutting in and apply the brakes when travelling around corners (at the speed limit).

My car is permanently loaded for camping/travelling so it is fairly heavy. I've had a Dobinsons 2 inch lift kit installed by my mechanic, in the lift I added 3 leaves from the original suspension to the 2inch lift 550kg spring pack and rides great! The only thing that occurs is some small bouncing after bumps in the road.

There is a bit of weight up high which I am currently trying to reduce but nothing that I thought would affect the cars stability.

Any ideas if the lift kit may have caused this or possibly overloaded? Haven't managed to get to a weigh bridge but I think I'm around the GVM.

Open to any thoughts so let them rip.

Photo for info:Click to view larger picture
Last edited by ashsut on Fri Oct 05, 2018 8:31 pm, edited 1 time in total.
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Re: ASC issue

Postby tmichel on Fri Oct 05, 2018 8:25 pm

I see the problem , It's upside down ;)
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Re: ASC issue

Postby ashsut on Fri Oct 05, 2018 8:32 pm

tmichel wrote:I see the problem , It's upside down ;)
Haha whoops, I think I fixed it.
Cheers

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Re: ASC issue

Postby ashsut on Sun Oct 14, 2018 8:50 am

Bump

Spoke with a mechanic the other day re this issue and his suggestion was to disconnect it - I said that defeats the propose of having a new/safe car with the feature.

Thoughts?

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Re: ASC issue

Postby RHKTriton on Sun Oct 14, 2018 3:09 pm

Have you noticed whether your inputting more or less steering as you go around bends/corners than prior to lift?

The ASC could be concluding a situation in progress by the yaw & steering angle sensors now being out of range.

This is assuming you don't have an underlying fault.
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Re: ASC issue

Postby DaveXT on Sun Oct 14, 2018 3:39 pm

You don't have to disconnect it just turn it off and see if that is really the issue or you may just have a faulty wheel sensor. I'd be looking for another Mechanic if he can't diagnose it.
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Re: ASC issue

Postby DaveXT on Sun Oct 14, 2018 3:45 pm

You could also try it with the box off the roof, it looks top heavy.
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Re: ASC issue

Postby NowForThe5th on Sun Oct 14, 2018 3:53 pm

ashsut wrote:I've had a Dobinsons 2 inch lift kit installed by my mechanic, in the lift I added 3 leaves from the original suspension to the 2inch lift 550kg spring pack


So...+550kg plus 3 leaves from the original packs. Should be rated to put under a B Double now.

This is your problem. The suspension is so hard that you're lifting a wheel every time you go around a corner - hence the TC/ASC kicking in to try to correct what it thinks is a skid.

Take the extra leaves out and the problem should go away. Alternately get the car weighed axle by axle and talk to a suspension specialist like Dobinsons or, preferably, Ultimate.
Chris

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Re: ASC issue

Postby ashsut on Sun Oct 14, 2018 6:24 pm

RHKTriton wrote:Have you noticed whether your inputting more or less steering as you go around bends/corners than prior to lift?

The ASC could be concluding a situation in progress by the yaw & steering angle sensors now being out of range.

This is assuming you don't have an underlying fault.
I don't think the steering has changed since the lift

How would you rectify this problem if you're right?

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Re: ASC issue

Postby ashsut on Sun Oct 14, 2018 6:37 pm

DaveXT wrote:You could also try it with the box off the roof, it looks top heavy.
Funnily enough I took the box off the roof today and went for a good drive around newnes today and I didn't experience the issue across the whole day. The ASC only kicked in under normal conditions off road as you would expect it to.

I emptied the water tanks the other day too. The box had a inflatable kayak that weights about 25kg tops and the annex for the kings tent which would be less than 3kg. The box itself is advertised at 28kg.

I guess 56kgs up that high ain't so good :/

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Re: ASC issue

Postby ashsut on Sun Oct 14, 2018 7:22 pm

NowForThe5th wrote:
ashsut wrote:I've had a Dobinsons 2 inch lift kit installed by my mechanic, in the lift I added 3 leaves from the original suspension to the 2inch lift 550kg spring pack


So...+550kg plus 3 leaves from the original packs. Should be rated to put under a B Double now.

This is your problem. The suspension is so hard that you're lifting a wheel every time you go around a corner - hence the TC/ASC kicking in to try to correct what it thinks is a skid.

Take the extra leaves out and the problem should go away. Alternately get the car weighed axle by axle and talk to a suspension specialist like Dobinsons or, preferably, Ultimate.
I did think it was a bit excessive but I originally just put the 550kgs in and the car still sagged in the rear, I'll get the car to a weight bridge asap but I think it's still under GVM.

I think going to a suspension pro is a great idea, its just time and money at the moment.

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Re: ASC issue

Postby RHKTriton on Mon Oct 15, 2018 7:05 am

All these new vehicles, with their electrickery, are quite 'sensitive' now. The days of the butch 4x4 are just about over, with the 'grease monkies' being replaced by shrinks. :lol:
Don't let the b'strds get you down!!
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Re: ASC issue

Postby WUNSIE on Mon Oct 15, 2018 9:05 am

RHKTriton wrote:All these new vehicles, with their electrickery, are quite 'sensitive' now. The days of the butch 4x4 are just about over, with the 'grease monkies' being replaced by shrinks. :lol:


AND

Text book Dealer Mechanics ( sorry, that's service technicians ) if its not readily available to read and Look up, its a case of Buggered if I know whats wrong, I can hear it but I don't know what s causing it, maybe its something in the glove box rattling :P
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