Date: Tue, 14 Jun 2005 20:45:16 GMT
From: John B <rotten_NOSPAM_nospam.org>
Subject: Re: abs troubleshooting


On Tue, 14 Jun 2005 13:51:51 GMT, I wrote: > > Next, I pulled the codes from the ABS computer using the protocol from the > Townsend Imports web site. It gave me the following codes, in this order: > > 1. 4444 - No fault > 2. 1241 - RF speed sensor > 3. 1243 - RR speed sensor > 4. 1311 - LR speed sensor > 5. 0000 > > If the computer were indicating a problem with the two rear speed sensors, > that might make sense. But it is also indicating a problem with the right > front speed sensor, which does not make sense-- I didn't even remove the > right front wheel. I didn't get any bites on this thread today, and the problem continued to eat at me. In fact, I actually left my comfortably air conditioned place of work in mid-afternoon, went to the parking garage, and started flipping through the Bentley manual. From the ABS wiring diagram, it looks like each wheel speed sensor can be tested from a 2-pin connector just after the wire enters the car. There should be resistance at something like 800 - 1400 ohms. My results: just over 1100 ohms at every wheel except the rear right, which had no continuity at all. So I took the road wheel off, took the wheel speed sensor out, and carefully inspected the wire. It looked like the outer insulation was a slightly cracked in a few places, but no major damage. After flexing the wire back and forth a few times, I read the resistance again- 1160 ohms. Yay. I put it all together, read all the codes from the computer again, and then drove the car > 20 mph, which should clear the codes. The warning light went off after I cycled the ignition. And so my auto mechanic skills advanced another notch. I hope someone finds this story useful. John

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