I have a 2000 Disocvery, and it will not come out of Rough road mode. driving or parked, No light or codes are shown. I have a nanocom evo. and it is showing Rough road mode active and knock inactive. and I can hear the engine knocking.
all the values seem correct for abs sensors but I do not have the test tools to see hz. that is called out for by the maintance manual.
could there be something else wrong? driveshaft vibrations cause it to go into rought road mode? any and all help would be very much welcome!
I've not heard of this problem, but I've had other problems on a 1999 disco that might be related. I had an issue with traction control and HDC where the SLABS computer couldn't get a good signal from the ECM for throttle position. Previous to that, there was an issue where the engine wouldn't idle when stopped because the ECM thought that it was receiving a road speed signal from the BCU of 88 mph, even when stopped. Both of these were caused by corrosion inside the two computers. I cleaned them up and my problems went away.
I unpluged the connector that sends the Rough road signal to the Engine ecu and pluged it back in(what I call Rerack) to see if it was a bad connection. no luck
And just put in an 04 slabs ecu in hopes that it would fix the problem but it is still there. Now the CDL works like an 04 after I turn the truck off with Cdl locked and turn the truck back on I have full TC, ABS, an HD, thats a perk!
First thing I'd do is remove the engine ECM and open it up and see if it's green inside. If so, I provide not warranty on these steps.... but I got them from a trusted land rover guru.
I used a soft tooth brush and dish soap, under warm water in the kitchen sink. Then I rinsed it with alcohol. Then I rinsed it with distilled water. Then I let it dry. I had to do it a couple of times because I missed some stuff.
If you aren't brave enough to do that, of if it's nasty inside and cleaning it doesn't fix it, since you've got a nanocom, you can just replace it with a used ECM and use the nanocom to sync the BCU security code, reset the adaptive values, and reprogram the VIN if you so desire.
But I'd only go through all of this effort if you have a good reason to believe that the ECM is bad.
Really Dont want to keep shotguning parts at it, but might buy a good used ecu. You are more brave than I at cleaning your ecu! I would try that only if I had another as a backup.
Don't do anything till you get us the actual fault code numbers, at this point we have nothing to work with.
__________________
Mike
Retired service manager, member of Solihull Society, SCLR, NCLR and the Santa Barbara 4Wheelers clubs.
99 D2, 3" lift, CDL with Detroit,T.T. lockers, 4:11's,H.D. axles, custom ft/rear bumpers with sliders, a 9500 HSI Warn winch and 5 HID's.
Retired service manager, member of Solihull Society, SCLR, NCLR and the Santa Barbara 4Wheelers clubs.
99 D2, 3" lift, CDL with Detroit,T.T. lockers, 4:11's,H.D. axles, custom ft/rear bumpers with sliders, a 9500 HSI Warn winch and 5 HID's.
Rough road is a signal that come from the slabs that tells the ECM to ignore some input from the knock sensors when you are driving on rough road conditions. The P1590 code that people get with the 3 amigos is an error in that signal, rough road signal implausible. The signal itself is normal and not an error. Apparently he is getting some sort of condition were the ECM is getting a reasonable rough road signal, so not throwing a code, even when the road is not rough.
Well the reason I asked, is with all my years as a service manager, I have never heard of this.
Maybe I should ask what the truck is doing when in the mode?
__________________
Mike
Retired service manager, member of Solihull Society, SCLR, NCLR and the Santa Barbara 4Wheelers clubs.
99 D2, 3" lift, CDL with Detroit,T.T. lockers, 4:11's,H.D. axles, custom ft/rear bumpers with sliders, a 9500 HSI Warn winch and 5 HID's.
Me either. But when my 99 did things that no one had ever heard of before, it was a green, crusty computer. That's why I was suggesting looking inside.
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2000 Disco Rough road mode help
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