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Engine Crunching with VSA Activation, then VSA, SHAWD, AFS lights all on

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Engine Crunching with VSA Activation, then VSA, SHAWD, AFS lights all on

 
Old 06-02-2019, 10:18 PM
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Engine Crunching with VSA Activation, then VSA, SHAWD, AFS lights all on

To begin, I even checked the thread about the threads to see if I could find this exact issue.

I have a 2009 RL and just recently Iíve run into a recurring problem: either all three of the VSA, SHAWD, and AFS lights come on within seconds of startup, or I begin to accelerate (slowly, straight, on dry ground) and I hear a crunching sound coming from what sounds like my engine bay, while my VSA triangle flashes, and my car subtly jolts around, followed by *ding* ďCheck VSA SystemĒ *ding* ďCheck SH-AWD SystemĒ *ding* ďCheck AFS SystemĒ

The problem does not occur if I disable VSA on startup, but eventually SHAWD and AFS lights come on around 5th gear/overdrive shift. However, before I get to that shift, I have noticed in the SHAWD section of the dash display (that shows the amount of power going to all 4 wheels marked by little squares) that my back left wheel is receiving little to no power at all times, regardless of turning or level of acceleration. Then once the warning lights have come on, of course the failsafe of only powering the front two wheels comes on, and Iím back to driving normally, but with no VSA or SH-AWD or power to my rear wheels.

My battery is only two years old and puts out plenty of power (had it tested).
I have an aftermarket subwoofer and amplifier installed, but the issue arose before that.
I am thinking of replacing rear diff fluid because Jiffy Lube doesnít replace that with their oil change like they do other fluids.

Any ideas?
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Old 06-03-2019, 09:53 AM
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The 'engine crunching' part seems odd.
The one wheel not getting power is odd.

You did not mention recent work, or previous issues that may be related.Or did any of these lights previously come on by themselves, with no other lights on...

How long since you changed differential fluids front and rear? trans fluids?

I know SHAWD usually follows VSA. If VSA goes on, shortly later you'll get SHAWD.

You need to be more specific as to the crunching noise, and if its from engine really or from the transmission or drive area (all wheel drive).

Also, if the battery is a dealer battery, 2 years is it's life; most need replacement shortly after 2 years of life.

Also, have the codes been cleared at some point by anyone. Or for any other reason have all the codes and settings deleted from the computer?

If so, and you lost your 'Neutral Position Memorization' setting, VSA will not work. I think AFS too since the car doesn't know how to set that leveling sensor. And SHAWD will light up if VSA is on.

A code scanner compatible with honda/acura should help set neutral position memorization. It's what you need to do before any other light.

If you have no scanner, you can try this, but follow every step carefully don't mess it up:

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Old 06-03-2019, 03:42 PM
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Check battery terminals
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Old 06-03-2019, 04:29 PM
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Originally Posted by RL09 View Post
The 'engine crunching' part seems odd.
The one wheel not getting power is odd.

You did not mention recent work, or previous issues that may be related.Or did any of these lights previously come on by themselves, with no other lights on...

How long since you changed differential fluids front and rear? trans fluids?

I know SHAWD usually follows VSA. If VSA goes on, shortly later you'll get SHAWD.

You need to be more specific as to the crunching noise, and if its from engine really or from the transmission or drive area (all wheel drive).

Also, if the battery is a dealer battery, 2 years is it's life; most need replacement shortly after 2 years of life.

Also, have the codes been cleared at some point by anyone. Or for any other reason have all the codes and settings deleted from the computer?

If so, and you lost your 'Neutral Position Memorization' setting, VSA will not work. I think AFS too since the car doesn't know how to set that leveling sensor. And SHAWD will light up if VSA is on.

A code scanner compatible with honda/acura should help set neutral position memorization. It's what you need to do before any other light.

If you have no scanner, you can try this, but follow every step carefully don't mess it up:

https://www.youtube.com/watch?v=3f11x3XGRns
Thanks for all the tips!
-The sound seems like itís coming from deep under the engine; feels almost like VSA is activating to try to maintain traction even though Iím going slow and straight, so most likely drive area.
-Battery was replaced with interstate battery two years ago and terminals look secured properly. I am, however, running power from the same battery through a separate cable/fuse to my subwoofer/amp in the trunk.
-I donít recall recently changing the transmission fluids or front/rear differential fluids unless Jiffy Lube routinely does it with full service oil changes, but would that cause the back left wheel to not receive power and/or cause the Check Active Front-lighting System (AFS) to come on?
-Iíll see if I can find somebody with a code scanner to set neutral position memorization. I did recently have Tire Discounters wipe my codes, but not all my settings. Probably wonít risk the YouTube tutorial out of fear of messing it up.
-I had my alignment done by Firestone along with a Steering Angle Sensor reset, if thatís what youíre referring to by neutral position memorization
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Old 06-03-2019, 05:48 PM
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Originally Posted by Derkvt View Post
Thanks for all the tips!
--I donít recall recently changing the transmission fluids or front/rear differential fluids unless Jiffy Lube routinely does it...
Have you lost your manual and service paperwork ? These various fluids are service items and should be replaced on a scheduled basis - the exact schedule is listed in your service history book. If the only servicing you're doing is at Jiffy Lube, you'll be missing a whole bunch of things - I think it's very unlikely they'll be changing anything but the engine oil.
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Old 06-03-2019, 07:05 PM
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Originally Posted by Nomgle View Post
Have you lost your manual and service paperwork ? These various fluids are service items and should be replaced on a scheduled basis - the exact schedule is listed in your service history book. If the only servicing you're doing is at Jiffy Lube, you'll be missing a whole bunch of things - I think it's very unlikely they'll be changing anything but the engine oil.
I have the service paperwork and just read that the last rear diff/trans/front diff fluid change was 60k miles ago 🤦🏼♂️
should I go to my Acura dealer for diagnostic since itís been so long? Or should I start by replacing all the fluids and resetting neutral position (which I fully understand how to, thanks to other forums)?
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Old 06-03-2019, 09:57 PM
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Originally Posted by Derkvt View Post
Thanks for all the tips!
-The sound seems like itís coming from deep under the engine; feels almost like VSA is activating to try to maintain traction even though Iím going slow and straight, so most likely drive area.
-Battery was replaced with interstate battery two years ago and terminals look secured properly. I am, however, running power from the same battery through a separate cable/fuse to my subwoofer/amp in the trunk.
-I donít recall recently changing the transmission fluids or front/rear differential fluids unless Jiffy Lube routinely does it with full service oil changes, but would that cause the back left wheel to not receive power and/or cause the Check Active Front-lighting System (AFS) to come on?
-Iíll see if I can find somebody with a code scanner to set neutral position memorization. I did recently have Tire Discounters wipe my codes, but not all my settings. Probably wonít risk the YouTube tutorial out of fear of messing it up.
-I had my alignment done by Firestone along with a Steering Angle Sensor reset, if thatís what youíre referring to by neutral position memorization
Well the AFS sensor is right behind the rear left wheel. Maybe your problem is indeed electrical.

Firestone did your steering angle sensor? That damned sensor when not done right can have all sorts of lights go nuts, and the car drives very funny. The dealer had to re-do it for all to be well.

I'd start by having those done i guess... steering angle sensor and neutral position memorization. It's shouldn't take a dealer more than 30 mins to do them.

The car's computer is supposed to tell you when to do each service interval. Is it not telling you?
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Old 06-03-2019, 11:49 PM
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Originally Posted by RL09 View Post
Well the AFS sensor is right behind the rear left wheel. Maybe your problem is indeed electrical.

Firestone did your steering angle sensor? That damned sensor when not done right can have all sorts of lights go nuts, and the car drives very funny. The dealer had to re-do it for all to be well.

I'd start by having those done i guess... steering angle sensor and neutral position memorization. It's shouldn't take a dealer more than 30 mins to do them.

The car's computer is supposed to tell you when to do each service interval. Is it not telling you?
Thatís really interesting that it seems to be a left-wheel-centric electrical issue.
Yeah it hasnít ever said any intervals unfortunately, and Iíve had the car for nearly 30k miles.
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Old 06-04-2019, 04:30 AM
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Speaking of the dealer, if my car was doing all that it would have been to the dealer days ago.....and I do ALL the work on my car myself.

"Crunching"?! Loss of power ON ONE WHEEL?! Just sayin' is all......
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Old 06-04-2019, 06:45 PM
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Originally Posted by Derkvt View Post
I have the service paperwork and just read that the last rear diff/trans/front diff fluid change was 60k miles ago
I don't think this is the source of your issue, but just for reference I had a quick look in the owners manual (the second book containing the maintenance history) and for my 2009 car the intervals are specified as Rear Diff Fluid every 40,000Km and both Transfer Fluid and Transmission Fluid every 100,000km - my manual spells out exactly what is required for each and every 10,000Km service.
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Old 06-04-2019, 08:20 PM
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loss of traction/activating ABS/uneven pavement will make a crunching sound with my family's '12 KIA sportage. it's traction control is not as advanced as Acura's systems and seems to be very sensitive, making the crunching sound every time loss of traction/activating ABS/Uneven pavement occurs

I suspect, like RL09, the AFS sensor
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Old 06-05-2019, 12:13 AM
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Originally Posted by Nomgle View Post
I don't think this is the source of your issue, but just for reference I had a quick look in the owners manual (the second book containing the maintenance history) and for my 2009 car the intervals are specified as Rear Diff Fluid every 40,000Km and both Transfer Fluid and Transmission Fluid every 100,000km - my manual spells out exactly what is required for each and every 10,000Km service.
Thanks for checking that out for me! So itís definitely something I need to do, but probably not the root of the problem, got it.
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Old 06-05-2019, 12:15 AM
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Originally Posted by justnspace View Post
loss of traction/activating ABS/uneven pavement will make a crunching sound with my family's '12 KIA sportage. it's traction control is not as advanced as Acura's systems and seems to be very sensitive, making the crunching sound every time loss of traction/activating ABS/Uneven pavement occurs

I suspect, like RL09, the AFS sensor
It just seems strange to me that the Adaptive Front-lighting System could cause the VSA and SHAWD lights to come on, not the other way around, and if it was just the AFS sensor, wouldnít the AFS light come on alone? Does the light tilting sensor somehow play into the vehicle stability assist and all-wheel drive systems?
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Old 06-05-2019, 05:27 AM
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Originally Posted by justnspace View Post
loss of traction/activating ABS/uneven pavement will make a crunching sound with my family's '12 KIA sportage. it's traction control is not as advanced as Acura's systems and seems to be very sensitive, making the crunching sound every time loss of traction/activating ABS/Uneven pavement occurs

I suspect, like RL09, the AFS sensor
Where did i say i suspect the AFS sensor to be the cause?

Originally Posted by Derkvt View Post
It just seems strange to me that the Adaptive Front-lighting System could cause the VSA and SHAWD lights to come on, not the other way around, and if it was just the AFS sensor, wouldnít the AFS light come on alone? Does the light tilting sensor somehow play into the vehicle stability assist and all-wheel drive systems?
Yea no, ur right. The AFS sensor does not cause all that. It merely goes on. It certainly doesn't make the wheel lose traction. But it will lose it's eyesight if neutral position memorization is missing.
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Old 06-05-2019, 05:28 AM
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Oh and just for the hell of it, make sure your engine oil level is fine.
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Old 06-05-2019, 07:53 AM
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im bad at reading. lol sorry guise. i didnt know the AFS stood for active front lighting.
what I was getting at, it may be a sensor for the ABS/traction control/wheel sensor
as the '12 kia grinds on uneven surfaces, and when I heard that sound for the very first time, I THOUGHT something was seriously wrong. but it's just the way the ABS or traction control on the KIA works.
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Old 06-05-2019, 08:14 AM
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^Get it together crabman!!!
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