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helton
Dodge Dakota
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1/11/2003
21:03:03
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 Subject: Abs and brake light????
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Message:
Ok. I have a prob. And I have looked at alot of postings and still no true idea. Today after I installed a round air filter on the top of my '98 V6 TB and drove it 30 miles and restarted it, both the Abs &Brake lights came on and have stayed on. I reset the computer 3 times and nothing. So can anyone help?
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slow2dak
Dodge Dakota
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1/12/2003
19:58:08
|  RE: Abs and brake light????
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do you have access to a scanner? if so it will probably say rear sensor open. what year is your dak. the abs sensor is on top of the rear end in the middle of the pumpkin. just my .02 worth.
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Zook1065
Dodge Dakota
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1/13/2003
04:02:28
|  RE: Abs and brake light????
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I just came home from work,I almost hit 3 deer at once,slaming on my brakes and locking all 4 up. When I left work , my abs and brake light came on as my speed increased. Also I tried to set my cruise and the light comes on but wont set. Would the abs sensor do this to the cruise too? And if so after I replace the sensor,how do I reset the computer?Its a 99 sport 5.2, and I'll take all the .02 cents I can get.Thanks
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Zook1065
Dodge Dakota
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1/13/2003
06:11:16
| RE: Abs and brake light????
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Message:
Ok, after an hour I searched the posts and found my trouble to be the switch by the break peddal. I pushed it in and let it snap out a few times and tried it out. I had my cruise right away and my break lights didnt come on. This is probable only a fix if your cruise doesnt work,if it does I would check the speed sensor on your rear pumpkin.
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helton
Dodge Dakota
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1/13/2003
18:22:30
| RE: Abs and brake light????
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Message:
I've got a '98 V6. The thing id, it jsut started doing it out of nowhere. I drove about a 1/2 hour to a place, and then when I started it back up it did it. I have no idea, but will check the pedal, if no luck, might as well take it in and have it looked at.
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bludakman
Dodge Dakota
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1/13/2003
23:02:24
| RE: Abs and brake light????
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By chance did you spin the tires? If so, a fault may have been generated because of it.
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helton
Dodge Dakota
JOIN HERE
1/14/2003
03:01:28
| RE: Abs and brake light????
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Message:
Alreight, here is the deal. I changed the air "hat" to a round air filter, reset the computer and it was o.k. Then when I left a shop that I went to, the lights came on. Not till the next day did I even notice the speedo only regesturing from 20mph. and up. So, from what I have read on here, I think it's the sensor. But, just so I don't f' around and waste money,I
m going to go ahead and go to the shop and let them find out.
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steve
Dodge Dakota
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1/14/2003
10:30:45
| RE: Abs and brake light????
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Message:
it's your vehicle speed sensor. just replaced mine.
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Neil
Dodge Dakota
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1/14/2003
11:20:28
| RE: Abs and brake light????
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Message:
It's the sensor on top of the differential. It serves as both the speed sensor for the speedometer/odometer and as the ABS sensor for the rear brakes.
It's actually a frequence generator (uses a magnetic pickup to pulse a fixed DC voltage applied across the sensor leads) that feeds into the CAB (Controller Anti-lock Brakes.) The CAB uses the it to detect rear wheel lock during braking (i.e. loss of pulses) and uses the actual frequence of the pulses (in conjunction with the axle ratio & tire Rotations Per Mile data) to calculate the speed/mileage data it sends to the PCM to drive the speedometer/odometer.
Because it performs double duty, the "sure" symptom the sensor's gone bad, in addition to the ABS & Brake trouble lights coming on of course) is the speedometer stops functioning below 20 mph. This happens because the system is setup to use the transmission's output speed sensor as a "back-up" speed/mileage sensor if the rear speed sensor isn't working properly and "that" sensor doesn't get to a high enough output level to be used this way until vehicle speed is above 20mph.
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