dguy

Rough Road Sensor

11 posts in this topic

Hello,

 

Does anyone happen to know the location of the Rough Road Sensor in a 451?  OBD claims that ours has an intermittent open circuit and I would like to check it out.

 

-d.

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could it be the Yaw/Lateral Movement/G-Force Sensor ?

What Does It Do?
Measures the lateral forces of the car.
What Happens If It Is Faulty?
ESP or Trust warning light will show, you may lose drive or safety systems can shut off.
Where Are They?
600cc - Underneath the undertray on the nearside.



700cc - Underneath the seat, underneath the carpet.

 

 

found online via evilution site https://www.evilution.co.uk/495

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There's no "rough road" sensor on the 451.  What OBD code did you use to get that? :)

 

If it turns out to be the yaw rate/lateral G sensor, it's underneath the driver's seat:

yaw%20ratw%20sensor_zpsvroak763.jpg

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8 hours ago, jwight said:

There's no "rough road" sensor on the 451.  What OBD code did you use to get that? :)

 

P0318, intermittent open circuit. From a scan with Delphi 2015.3 and a DS-100E.

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After some bathroom reading, it would seem that P0318 is set when data from any of a collection of sensors may be interpreted as a rough road contributing to the anomalous reading.  In other words, P0318 is somewhat of a red herring.

 

We also have an intermittent implausible signal from the left rear wheel speed sensor. It won't surprise me if resolving that will clear the "rough road" error as well.

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14 minutes ago, tolsen said:

Perhaps a cracked abs ring?

Damn...beat me to it again...lol....and an easy fix and inexpensive.  I also tell everybody.......check all your grounding locations that are any where near close to the problem you are suffering......open them all up and check each and every eye connector for any corrosion at all then when re-assembling, use a smeer of dilectric grease to help prevent it happening again at that pin.

 

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I'm definitely not discounting a cracked ABS ring, but from my experience they're an "on or off" issue.  Once they crack sufficiently to throw off a sensor reading, the error will persist until resolved.  This really is a sporadic wet weather-only error at the moment.

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30 minutes ago, dguy said:

I'm definitely not discounting a cracked ABS ring, but from my experience they're an "on or off" issue.  Once they crack sufficiently to throw off a sensor reading, the error will persist until resolved.  This really is a sporadic wet weather-only error at the moment.

As it's a wet road only issue the traction control will will trigger with anything over a 2-3% difference in wheel speeds IIRC.

I trigger mine all the time on wet roads and parking lots.

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3 hours ago, BWM said:

As it's a wet road only issue the traction control will will trigger with anything over a 2-3% difference in wheel speeds IIRC.

I trigger mine all the time on wet roads and parking lots.

I can only trigger mine in very wet or snowy conditions as in the dash light lights up but then goes out once it see's things are back to normal.....it basically slows car down until it see's things are safe again. Amazing how well this system works, but annoying to say the least when you want more tire spn.  So I have a switch now to over ride this system on dash!....lol

 

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