I have my 4 amigo’s pop up very regularly, as I coast to a stop. Always when I’m just stationary.

slabs says “front right sensor, electrical failure”.

motronic says “p1592 rough road signal implausible”

Replaced both front hubs/sensors fairly recently, (within 18 months) chasing this issue, which did seem to solve it for a while.

Reading around, this guy with his P38 had ‘exactly’ the same symptoms. I’m going to guess that LR used the same systems for both cars.

https://www.landyzone.co.uk/land-rover/p1592-rough-road-signal-implausible.370718/

I’m fairly bright but I don’t follow much of what they are talking about in this thread. It gets quite deep and doesn’t seem to get resolved.

With this info does anyone have a similar experience?

My first action will be to check the yellow connections, but with being recent I’m expecting them to be fine.


Slabs

Motronic 1/2

Motronic 2/2

 

The ABS system manufacturer has as top supreme secret, not revealing the acting logic.
Check for clean, tight, firm, dry, scraped corrosion on contact pins in those connectors. I believe the 'rough road' comes from flaky level sensors circuitry; those by the rear suspension. Check also their connectors condition and cable health.

 

Are these the rear wheel speed sensors, or something else?
I didn’t know there was anything else back there. What am I looking (googling) for?

thanks.

 

My guess is intermittent signal. I have a couple scanners that plot the sensor outputs which is a digital square wave. Regardless of having one I would start by checking the sensor connections, then swap sensors left to right, then swap ECU input left to right (will require depinning the connector).

 

I can swap the sensors left/right at the box, yes? Just flip the connectors around?

That sounds like an achievable thing that tells me a lot.

 

P1592 is a generic code that seems to pop when there's an ABS code. It's not telling you anything other than to look at the codes for the ABS system.

 

They are all in one connector, so you would need to de-pin the connectors out of the plug to move them.

 

The dude with the P38 in the link replied saying his issue was a broken reluctor ring, confusing the speed sensor.

I really dislike this issue.

 

Will your scanner display the individual wheel speeds? I had a similar issues, one of the wheel speed sensors would flake out at a certain speed. Don't assume the new parts are good first of all. I have gotten my fair share of faulty sensors. Did you run the wire all the way to the slabs or did it come with the plug?

 

Hi, the 4 brakes/wheel speed sensors are at each hub. The sensors responsible for "rough road" may be the ones for ride height at the rear suspension arms and their connectors nearby. But everything about WABCO is a tight mystery hole.
This is how it looks :