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Reseting codes by disconnecting batt?
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fastrunner08
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PostPosted: Mon Jan 28, 2013 12:36 am    Post subject:  Reseting codes by disconnecting batt? Reply with quote

so this isn't so much a pcm question as a bcm question i think, but please correct me if i am wrong. I have been having issues with my anti lock brakes system shutting of on the 2004 ss. Light is on right at start up before i even put the car in drive or reverse. I took the car in for a read, found that there was a short in the driver's side, and open in the pass side front. I found the shorted wire, replaced it, and replaced the wheel bearing on the other side. still got the instant light at start up. I took the car in to get scanned again, and the scanner was only saying it was a history code not a current code. I unplugged the battery for two days hoping to reset all the computers, but i am still getting the light, and advance is still reading it as a history code only but not an active code. Any Ideas how to reset this, or is there possibly something still wrong with the abs. Saddly i can't talk the guy into clearing the history codes, i have tried 3 times now.

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PostPosted: Mon Jan 28, 2013 1:33 am    Post subject:   Reply with quote

Which light is on? The MIL light or the SVS light?

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PostPosted: Mon Jan 28, 2013 9:35 am    Post subject:   Reply with quote

Did you just disconnect the negative or did you disconnect both? Should have both disconnected and for just 15 min, that's all it takes. So if there is no problem the light shouldn't be on. If you have an o'reily by you, they loan you the scanner as long as you give them your drivers license. I believe the abs system is something that the computer checks pretty much instantly when you start the car or move it, indicating that something's wrong. It's the abs light that pops on right?

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PostPosted: Mon Jan 28, 2013 10:39 am    Post subject:   Reply with quote

it pops on right when you start the car, but usally it shouldn't kick on till you move the car. it is just the abs light coming on. And yes i thought by disconnecting both battery terminals it would erase everything however i know for a fact it does not because a month ago i did a brake bleed, and durring the process the car detected low brake fluid. I have had the battery disconnected completely for 3 days while a i did a lim rebuild, and then just two days ago when i tried to reset and the low brake fluid code is also stuck in history. I know for a fact that the car does not have low brake fluid and like i said the code is coming up history from the scan therefore i don't think that is erasing the issue. My local Orilies doesn't have a scanner that can read abs.

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PostPosted: Mon Jan 28, 2013 12:22 pm    Post subject:   Reply with quote

The scanner at the parts shop isn't gonna be able to pull ABS codes. If you have an ABS light on, you have a problem with the system. Resetting the PCM isn't gonna clear that. I'd start by checking the wiring harnesses at each hub and then go from there.

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PostPosted: Mon Jan 28, 2013 1:00 pm    Post subject:   Reply with quote

So is your brake fluid light still on or just in history? If your low brake fluid light is on and you can see that your resivor is topped off, it means that the sensor is busted. The low brake fluid light is an indication obviously that your brake fluid is low. This is supposed to really tell you that you need new pads because the pistons are pushed out more to compesate for lack of pad, which means there is more fluid in the caliper so your break fluid will look low. If you have new pads and your resivor is low... you have a leak but sounds like you have fluid topped off so your sensor is faulty. This is also all assuming that your saying your low fluid level is still on.

And yes, I forgot that part stores can't pull up abs codes. They should really start making that a standard in systems. Since abs is not a really a new thing anymore, the new thing is telematics...

Sorry for getting off topic, but if you still have the abs light on, then yes you have a problem. Really you shouldn't have to disable the battery if you fixed the problem because the computer does a abs check everytime you start the car. Hopefully this helps!

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PostPosted: Mon Jan 28, 2013 1:44 pm    Post subject:   Reply with quote

no the fluid is no longer low, that was also a history code. Yes, the parts store advanced auto can read abs codes, as i was able to get mine read by them. Again i did find a problem with the wiring harness and i fixed it by sodiering on new ]wires. When i went back to the story they re-read it and in stead of coming up as a current trouble code it was coming up with the abs as a history code now. The abs light is still on, but again from everything i read so far. that will kick automaticly at start up even if it is fixed as long as it is still in history. Therefore i think the next step would be to clear the history codes and see if the light goes out, or if it stays on and displays new current abs problem codes. so that brings me back to my first question is there any way to clear history codes other than the battery trick, because that obviously isn't working.

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PostPosted: Mon Jan 28, 2013 1:49 pm    Post subject:   Reply with quote

Besides a scanner? Not sure, but im sure someone knows how. Is the abs system in conjuction with the pcm or bcm? I would think mabye disconnecting the pcm if it resides in there.

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PostPosted: Mon Jan 28, 2013 4:46 pm    Post subject:   Reply with quote

i know it is but im not sure which, i think thought that it is the bcm that stores its codes

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PostPosted: Mon Jan 28, 2013 6:10 pm    Post subject:   Reply with quote

I highly doubt the system holds history ABS codes to display everytime the car starts, even after a repair.

When the connections are going flaky or have corrosion, the warning light will light up WHEN it happens. If an issue isn't detected at startup, it won't illuminate the warning light. I know because mine would come on intermittently while driving for almost 2 years, and now that the connection is finally completely toast, it lights up on startup every single time.

The light will come on immediately when the connection is lost. Troubleshooting an occasional light can be done by jacking up the car and wiggling connections while the car is running on jackstands because as soon as you break the connection, the light illuminates and the warning bongs come on.

Still sounds to me like you have a bad connection.

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Last edited by Lingenfelter on Mon Jan 28, 2013 11:25 pm; edited 1 time in total
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PostPosted: Mon Jan 28, 2013 10:57 pm    Post subject:   Reply with quote

Reading through your post..How come they didn't clear the code's for you the first time? ABS codes are stored in the EBCM.

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PostPosted: Mon Jan 28, 2013 11:32 pm    Post subject:   Reply with quote

^
Auto part stores are not allowed to clear the codes. Must be a law or something with the company's rules.

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PostPosted: Mon Jan 28, 2013 11:52 pm    Post subject:   Reply with quote

TeenBeach wrote:
^
Auto part stores are not allowed to clear the codes. Must be a law or something with the company's rules.


Probably not illegal, but I'm sure they don't want to pay their employees to go and dump codes from everyone's car, especially if people feel that it'll make their car pass emissions. Having a firm policy of scanning only serves the parts store to help sell more parts.

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PostPosted: Tue Jan 29, 2013 12:00 am    Post subject:   Reply with quote

Honestly, any shade tree mechanic should have a cheap scanner in their toolkit. Hell, I had my brother buy this scanner ( http://www.amazon.com/AUTEL-Ma.....d2+scanner ) to check codes that pop on his car before he drops money at the dealer.

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PostPosted: Tue Jan 29, 2013 12:27 am    Post subject:   Reply with quote

IffyG wrote:
Honestly, any shade tree mechanic should have a cheap scanner in their toolkit. Hell, I had my brother buy this scanner ( http://www.amazon.com/AUTEL-Ma.....d2+scanner ) to check codes that pop on his car before he drops money at the dealer.


A scanner, some research on automotive forums, and a basic set of tools are easily some of the best investments a person can make.

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