[V8] Intermittent ABS light and diff locking up

[qshipq at aol.com]

 I've cleaned many ABS teeth, and this could definitely be the problem.? On the fronts, you can pull the driveshaft out of the hub enough to clean it without major dis-assembly.? I really doubt trans codes will help you in any way here.? I put up a pretty nerdy post a several months ago on how the center locking works on the v8, and Tony described it again well.? It appears you have a diff lockup signal sent from the trans ecu, caused by one of your abs sensors out of whack with the others.? Fix the signal, you likely won't have a problem.? As a rule, the trans ecu could care less what the actual ABS sensor values are, it's only looking for the differences in them.? The ABS computer on the other hand, is looking for actual value *and* differences between them. 

HTH and my .02

Scott J
92 v8 4.2 ABT chipped


 

-----Original Message-----
From: Tony and Lillie <tonyandlillie1 at earthlink.net>
To: Mark Kalbskopf <gbmarc at cox.net>; v8 at audifans.com
Sent: Sun, Sep 13, 2009 12:43 am
Subject: Re: [V8] Intermittent ABS light and diff locking up










The other thing you might find is junk/dirt in the ABS sensor wheels. These are 
on the end of the outer CV joints. I've never had to clean one, so others may be 
of more help here.

Tony


-----Original Message-----
>From: Mark Kalbskopf <gbmarc at cox.net>
>Sent: Sep 12, 2009 9:33 PM
>To: v8 at audifans.com
>Subject: Re: [V8] Intermittent ABS light and diff locking up
>
>I disconnected all the ABS sensors in turn this afternoon and measured  
>the resistance across the sensor.
>3 of the sensors were exactly the same at 1500Ohms, and one was  
>2000Ohms.
>Not exactly a huge difference.   I was hoping to see one at infinity.
>The wires are good quality, well protected, especially the connectors,  
>and quite thick, so I can't see why there would be any corrosion.
>I guess I'll try pulling the transmission codes tomorrow.
>
>Mark.
>
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