Davenlei

iTrader: (1)

So I recently found out one of the front shocks on my F-sport was leaking slightly. I took it in and they replaced it under warranty so that was good. In conversation with the lead technician, he said in 2013 there was a production run of F-Sport shocks with faulty seals which will have a very small, slow leak but not show any loss of road absorption. He said he has seen them come in from time to time and it is always just one shock per car.
If you have a 2013, check your front shocks for a very,very small amount of oil coming out from under the sheath cover.

ECL

When my 2013 F-Sport was about a year old, my independent mechanic reported that one of the front shocks was leaking. The dealer replaced it under warranty. I assumed I hit a pot hole.

viperr

iTrader: (1)

Would this also affect 2013 non-Fsport models? Are the shocks the same between fsport and non-fsport?

Davenlei

iTrader: (1)

The shocks are different between vehicles that can do 'Sport+' mode (adjustable damper suspension) and not. If your car can only go up to 'Sport' mode, then you do not have the same shocks as F-Sport models.

He did not mention non F-Sport shocks but that does not mean they are not affected also.

Davenlei

iTrader: (1)

Here is what the leaking on my shock looked like.

macnugget

Thanks for the info, I had the same leaking on my car. Brought it in under warranty repair. only happen to the right front.

Davenlei

iTrader: (1)

Cool. Glad it worked out for you. Mine was the front right as well. The service advisor said it is rare but when it happens, it always seems to be the right side.

Awells1980

2015 Fsport. My fronts both leak. Right side leaks so bad my wheel gallops past 70 mph.

jgscott

iTrader: (1)

Join the unfortunate club, so it's doc.

https://www.clublexus.com/forums/gs-...-database.html

peteharvey

Different engines in 200t/300/350 use the same suspension part numbers.

The non-F Sport use different shock absorber part numbers to the Luxury and F Sport trims.
However, the Luxury and F Sport trims use the exact same shock absorber part numbers.
Below is a chart showing the suspension part numbers for the Luxury and F Sport trims.






Below, the Luxury and F Sport trims use the same "software mapping" during Normal Mode, however, they have different software mapping during Sport+ Mode - to control the shock absorber valves.

jgscott

iTrader: (1)

@peteharvey and/or anyone else than knows the correct info?

So if the F Sport AVS vs The Lux AVS is Tuned different from the Factory?

I think the F Sport w/ AVS Steering ECU is different that the Lux w/ AVS. Is there a Separate ECU that controls the Sport Plus mode, that is different also? Is there some separate ECU that controls the AVS, or it the Steering ECU that controls the AVS? Or is it the Actuators that are diff on the F Sport vs LUX? Anyone know the answer?

GrandSedanFan

iTrader: (1)

The dampers are tuned differently between Luxury Package and F-Sport, but only in Sport+ Mode. In Normal Mode, they respond/behave exactly the same.

I do not know which ECU controls the dampers, but I do not believe that it is the same ECU that controls the Electric Power Assist Steering (EPAS).

The actuators and the dampers are physically the same. The difference is in the tuning, which may either be through different programming or a completely different P/N ECU.

The below video contains the original 2013 Lexus presentation on the car, including an in-depth look at the differences in the tuning/response of the Luxury Package and F-Sport dampers over the same section of track. This discussion starts at 8:43 and, if I have embedded this video properly, should begin at that point.

peteharvey

Yes, I also suspect the Luxury w/AVS and F Sport w/AVS have different ECU's for steering/suspension.
I would doubt that there is a separate ECU for the Sport + mode.
I honestly don't know if there is a separate ECU for steering and suspension.
I suspect the actuators for the AVS shock absorbers are the same.
It is the software mapping in the video that is different.
If you telephone Lexus parts department, they could tell you if the ECU's and/or actuators are different, and if there are separate steering and suspension ECU's.


Regarding your shock absorbers.
You have a 2013 Luxury with AVS modded with Swift springs and 19" RCF wheels.
You find that compatible KYB gas struts are too firm riding.

I have driven the 12/2011-01/2014 AVS, but it was so long ago, I cannot remember, and I never compared them back to back, because back then, only the one version was available. Did you ever try the 12/2011-01/2014 AVS yourself?

I have tried my OEM which was 10/2014-10/2015 and was by far the most "tied down" shock absorber with little float; the frequency of vertical oscillation is high, so it feels tiring.
I have retrofitted the 01/2014-09/2014 shock absorbers which were a little softer.
Then I retrofitted the 10/2015-08/2020 shock absorbers used on the mid-life refresh which I find by far the softest; the frequency of vertical oscillations is low, so it feels floaty and more comfortable.
These three models of shock absorbers - I have had the opportunity to drive them back to back at the same time on different 4GS's.
So, up to you how soft [nee float vs controlled] you want on your 4GS.

Best to find out from someone who has Swift springs with midlife refreshed 2016-20 OEM AVS shock absorbers...

GrandSedanFan

iTrader: (1)

According to the Toyota TIS Service Manual, specifically Doc ID: NM100000000T601, the Steering and Shock Absorbers are controlled by two separate ECUs, both appear to be in the passenger side dash, above the glove box, possibly adjacent to the passenger front airbag.

jgscott

iTrader: (1)

Looks like this is the Suspension shock ECU control for the AVS F Sport below.

https://www.ebay.com/itm/16688987313...temCondition=4

This is a different part number so I'm guessing it the Reg AVS Lux one?

https://www.ebay.com/itm/27483552435...Bk9SR7zVocGmZA

I would not trust confirmation using the ebay make, model, trim checker though.