[MaseratiByChance]

Can you actuate the park brake and will it hold the vehicle in place when set? Can’t remember, is the suspension module in the trunk? Might have a look at the connector, check for water intrusion and wiring to the module. Can you see all the modules with your scan tool that are showing faults and are they showing any data?

 

[MaseratiByChance]

What your saying makes since, wouldn't hurt to inspect the NFR connector for water intrusion and terminal tightness. During my time working on those I never had this problem. I would also inspect the NFR grounds and power as well as CAN communication circuits.

 

[MaseratiByChance]

Bump. Semi-desperate here. My next move is to just throw parts at the car and I hate doing that.

Now a days you will find even the manufacture paid technical support will do just that.

Right now I’m between tires and an ABS computer. I wish this forum was more active. I feel like it this is a common enough problem that someone has some insight..

I can feel your frustrations but I don't think this forum is about getting tech support to repair your car.

Myself and a handful of others here give help out of the goodness of our hearts. We can give advice and only make some suggestions.

Today I noticed that the car tried engaging traction control and limiting power under moderate acceleration. That seemed odd and eventually it errored out, threw up all its warnings and gave up. That’s when it lost the speedo.

ok

I decided to check the tires and noticed the dealer put two new 245 45 20’s up front. Those are substantially larger than the stock 245 35’s.

What's on the rear?

I also read the data stream and noticed the speed variance between front and rear wheels.

Definitely something not good.

So now what I think is happening is that the brake computer can not reconcile the difference between front and rear wheel speeds, is erroring out and taking any module that requires vehicle speed with it. This also explains why I’m not getting a specific sensor failure code. The car wouldn’t know what set of wheels is giving accurate information and which isn’t. It would just know that the data is implausible.

I would agree

So then here’s my question. Hopefully a really simple one. When this happens I get the Christmas tree of lights and lose my speedometer however i can still read the raw vehicle speed sensor data through my scanner. Is the loss of speedometer normal for when the ABS computer detects a vehicle speed issue on one or more wheels?

I my opinion no but I'm not an engineer and unless one had encountered that fault before then one would probably not know the answer to that question.

By the way I'm answering your questions as they come in order, after reading through your post I could have easily said to correct the vehicles tire sizes so one tire isn't taller than the other, throwing off the speed sensors. But that wouldn't had been as fun.

I think my skyhook module for not being able to communicate with the NFR might be a symptom of the NFR going into error mode and/ or a symptom of my scanner putting it into dish mode and taking it offline for a moment.

I think now you are over thinking.

Thoughts?

I think at the point you noticed the different tire sizes you should have made that correction. Then after the correction if it still had a problem then ask for more help.

Boy I sure hope this helps someone with this oddly specific problem down the road. 😂

Hopefully what people can learn from this is to correct first what you see wrong and then continue on from there before wasting more time than needed.

Last thing, your comment " I wish this forum was more active. I feel like it this is a common enough problem that someone has some insight" was enough for most to not even want to answer you because it was a bit rude. Only because I'm such a nice guy that I did and to say to anyone out there that may be trying to repair their car on their own to always fix first the obvious then continue on from there. Hope this helps someone.

 

[MaseratiByChance]

I think tech support, hands on experience with specific problems and shared experiences are exactly what forums are for. Ive owned and worked on a wide variety of cars and been involved with a bunch of communities over the years and that’s exactly how this has worked.



Which is why I’m here trying to ping the collective experience of the community to see if anyone has had this exact situation.



I noticed the tires last night and figured I’d ask here to see if I’m barking up the right tree. There was nothing I could do about it last night.



My man, how condescending and presumptuous.



Whatever you think you offered because you’re a nice guy, it wasn't assistance. Nobody would look back on this post and be like “boy that comment where maseratibychoice said “ok” and “I agree” is what really helped me solve my problem!”.

You came in here and did some head nodding, criticized my approach, offered no specific technical insight whatsoever and then told me what a nice guy you were for doing all of that in spite of my desire for this forum to be more active, which by the way, isn’t a dig at the forum or its members. So I’m not sure how you arrived at that conclusion.

Active forums have many voices with varying experiences and many data points. People share their first hand experiences, what works, what doesn’t work, etc. This isn’t a very active forum so you don’t really get that here. It’s nobody’s fault and I’m grateful for all the data that is here already.

Condescending and presumptuous is my middle name and hopefully correcting your front tires will remedy your problem. Have a nice day,