Sorry for the Dweeb type question. I've got the dreaded ABS trio and finally accessed the code P1590. This code is the "Rough road signal implausible fault".
I've ohmed out the wheel speed sensors and actually checked that they were sending a frequency with the wheels spinning. Everything here looks normal. All sensors check out roughly the same.
I swapped the abs relay in the engine fuse box with an identical one with no love.
According to http://www.disco2.com/tech/v8ems/faultcodes.phtml, "Hardware is OK, but SLABS ECU is sending an error signal".
So, what the hell does that mean? What size hammer will I need to fix this.
Come on Phineas! I know you have the answer!

unless its ripping all the abs shit out to convert to powerboost, i don't think anybody on here is really going to have an answer for you. the problem with all the new electronics is that you really need the right diagnostics software to be of much use to your vehicle. my .02 - find a dealer or other shop with the right tool, or figure out where to source one for yourself.

You're absolutely right about that. Trouble is that the nearest dealer is about 2 hours away and I'm to stubborn to admit defeat just yet.
Got a couple more things I want to check but I'm sure I'll end up at the dealer sometime in the near future.
Oh well, I'll visit Steve at Rovertym when I'm there and we can talk about this Watts linkage stuff.

it's the damned extraneous ecu's that kill me. a friend of mine has the OBDII decoder ring software on his laptop and generally gets by with it, but its not capable of resetting certain codes, nor reading shiaat from the brakes. i ripped the crap out of mine, but it is , admittedly, much simpler than your DII.

Hello, I am not guru with DII.(not with anything else either) Here is one thread from Rovacom forum, is it possible that yours is in same situation?

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Had a vehicle this week, it has been owned by customer for approx 3 years, about two weeks ago he had all the lights illuminated on the dash (ABS/TC/HDC), after looking at the faults, all of them listed were for Air suspension (which was not on this vehicle). When we checked in settings, the ECU was set for Air Suspension, we changed it to coil and all lights extinguished.

He says the fault occured when he was driving the vehicle through a town and that there had not been a problem with this since he had owned this vehicle. I have heard of stories where parking the vehicle in major supermarket car parks had caused erroneous errors or faults on systems and wondered if anyone els had come across this problem?

David

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This may not help much... :(

When we got the bone stock '97 Defender, the CEL was on due to a "rough road" fault code.

After much resetting by the "tech" I pointed out a loose ground wire .... hmmm, turns out that its a good idea to ground those computers :)

No, there's no abs on the 90, but I'm pretty sure it uses the abs tone signal to create the "rough road" fault.

Might be worth a peek to see if anyone has been re-wiring your Disco.

I've got information on specific connectors and wires that I'll ring out tonight.
I'll see what I find, if anything.

The ABS on my 2001 Defender was erratic, at best. It turned out that the permanent solution was to change wheel bearings. The front right bearings were so sloppy that the ABS sensor tripped from the CV moving when turning right or driving over a bump. I spent some dollars on new sensors and gained some grey hairs from trying to figure it out before I changed the bearings...

The ABS on my 2001 Defender was erratic, at best. It turned out that the permanent solution was to change wheel bearings. The front right bearings were so sloppy that the ABS sensor tripped from the CV moving when turning right or driving over a bump. I spent some dollars on new sensors and gained some grey hairs from trying to figure it out before I changed the bearings...

The DII uses a hub assembly. What does the 2001 Defender use?
I actually thought about getting a low mileage boneyard hub as a spare anyway.

The DII uses a hub assembly. What does the 2001 Defender use?
I actually thought about getting a low mileage boneyard hub as a spare anyway.

Even late Defenders have the traditional rebuildable hubs. Bad bearings should produce the same results in a DII/Rangie P38 hub, though. Enough slop, and the ABS sensor will loose track of the ABS ring on the CV.

Hi All!
Ive read your postings about the P1590, and in way they have help me and my mechanic to clear some serious doubts about this code. However, ABS, TC, and HDC lights are still on.

Here is the deal, I have a 2000 LRDII that I bought from this fellow. He told me that the vehicle had a severe crash on the front-RH wheel area. Which I think it damage the diferential. In fact, it did because it has a very hard-shaky sound when you accelarate.

Do you guys think that a malfunction in the diferential will be a consecuence of this P1590, therefore, having the ABS, TC, and HDC lights on?

I appreciate your help!

TecateRover

Why don't you find out by fixing your mechanical issues first? Sounds like you have at least one bad CV, and maybe worse. Which needs immediate attention regardless of ligths.