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Old 02-18-2013, 07:12 PM   #1
LazyGLH
Scooby Newbie
 
Member#: 347274
Join Date: Feb 2013
Chapter/Region: E. Canada
Location: Halifax, NS, Canada
Vehicle:
2002 WRX Sedan
WRB

Impreza WRX Diagnosing ABS Sensor Problem with NO Light/Code 02 WRX

My 02 WRX today started engaging the ABS when coming to a stop. It does it consistently when there is no wheel slippage. The problem is fairly well documented here it seems, and it appears to be related to a weak ABS sensor or signal. The bugger is that it doesn't produce an ABS code (light not lit) so it's a bit of a guessing game to diagnose (I also don't have a scope to test for signal).
My understanding is that it could be 1 of 4 sensors, tone rings, wheel bearings or the abs module. I was planning to pull and clean the sensors, is there anything else I can check while I'm at it? Whatever it is, it's not enough to trigger a fault.
I'm going in for a check on the control arm recall, would I be better off getting the dealer to check this or is it going to be a (expensive) guessing game for them too? I'll add that I believe my front pads are at end of life as well, not sure if that would have any impact on this problem. This problem also started shortly after hitting a bumpy railway crossing (could have damaged bearing or tone ring?) although it was hardly a memorable bump, maybe it was enough?
I've only owned the car a week, and I'm trying to get on the learning curve. Thanks for any tips!
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Old 02-18-2013, 08:20 PM   #2
Knotsure
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Member#: 41730
Join Date: Aug 2003
Location: Jersey
Vehicle:
0910 Leggy3.0/Impr
BLU Leg/BLK Imp

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iirc, maybe check your tires? I seem to recall a 'sensitivity' if you have one or two with a diff. tread pattern or minute variances in size? I know I had an issue w/my 02 (I still miss that bugger) when I had to use a donut and then only replaced one tire?
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Old 02-18-2013, 08:47 PM   #3
LazyGLH
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Member#: 347274
Join Date: Feb 2013
Chapter/Region: E. Canada
Location: Halifax, NS, Canada
Vehicle:
2002 WRX Sedan
WRB

Default

I'm running 4 XIce 2 tires with less than 10k miles on them, checked pressures last week but will check again. Whatever the problem is, it came on all of a sudden. It went from every few stops to every single stop in the span of an hour or so. Whatever caused it didn't happen instantly, but it was a rapid progression.
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Old 02-21-2013, 03:50 PM   #4
LazyGLH
Scooby Newbie
 
Member#: 347274
Join Date: Feb 2013
Chapter/Region: E. Canada
Location: Halifax, NS, Canada
Vehicle:
2002 WRX Sedan
WRB

Default

Before I could even get the car inside to clean the ABS sensors and look around, the problem seems to have disappeared as mysteriously as it came. Not complaining, but it would have been nice to know for certain what it was...
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