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ABS and Traction control

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Old 05-15-2018, 09:33 AM   #1  
Tom Robison
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Default ABS and Traction control

Does the pcm have anything to do with the abs or traction control or is it all through the bcm?
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Old 05-15-2018, 09:12 PM   #2  
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I won't claim to really know this stuff but I've got a demo version of HP Tuners and a stock HPT file, and there are some clues in there about the PCM's role in traction control...

There's a table that HPTuners calls "Traction control spark retard vs. RPM" that appears to be used to retard ignition timing in response to a signal from a traction control module.

There's also a table that is used to selectively disable cylinders in response to a torque reduction signal from the TCM.

I'm sure it's not the whole story, but it's a start.

Why do you ask?
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Old 05-16-2018, 05:36 PM   #3  
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My car has been 0411 pcm swapped and is all jacked up. The abs and traction control lights are one. Was wondering if it could be in the tune or in the bcm. I am going to run the wiring to the pcm tonight to make sure it's correct.
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Old 05-17-2018, 12:16 AM   #4  
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Both the traction control system and the ABS brake system uses data from all 4 wheel speed sensors---The TC system uses the data to prevent the wheels from spinning on a hard launch and the ABS system uses the data to prevent the wheels from skidding on a hard stop---You can delete almost all the traction control with tuning in your ECM But never all of it--As far as the ABS braking goes this involves the ECM the BCM and the ABS controllers---Why wou;d you ever mess with the ABS braking system ? It saves your *** !!
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Old 05-17-2018, 05:06 AM   #5  
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Have you read about what people call "ice mode?" I'm sure that's not what GM called it when they created it, but it's a widely despised "feature" of C5 ABS.

Like so much else about the car, it works fine for most people most of the time, it just isn't tuned for track use. Which seems like a solvable problem, if we could just get access to the parameters.
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Old 05-17-2018, 06:24 AM   #6  
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Quote:
Originally Posted by tblu92 View Post
Both the traction control system and the ABS brake system uses data from all 4 wheel speed sensors---The TC system uses the data to prevent the wheels from spinning on a hard launch and the ABS system uses the data to prevent the wheels from skidding on a hard stop---You can delete almost all the traction control with tuning in your ECM But never all of it--As far as the ABS braking goes this involves the ECM the BCM and the ABS controllers---Why wou;d you ever mess with the ABS braking system ? It saves your *** !!
I am not wanting to mess with the abs system. I am trying to figure out if the pcm swap is to blame for the dash lights or there is actually a problem. I don't want to throw money at something I'm not sure about.
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Old 05-18-2018, 11:53 PM   #7  
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Quote:
Originally Posted by tblu92 View Post
You can delete almost all the traction control with tuning in your ECM But never all of it
I apologize for hijacking, but can you please tell me more about this? What can be deleted, what are we stuck with, and how is it done?
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