how does traction control work???
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
From the Service Manual .......
Traction Control System (NW9)
When drive wheel slip is noted when the brake is not applied, the EBCM will enter traction control mode.
First the EBCM requests the PCM to reduce the amount of torque to the drive wheels via the requested torque signal circuit. The PCM reduces torque to the drive wheels by retarding spark timing and turning off fuel injectors. The PCM reports the amount of torque delivered to the drive wheels via the delivered torque signal circuit.
If the engine torque reduction does not eliminate drive wheel slip the EBCM will actively apply the drive wheel brakes. During traction control braking, hydraulic pressure in each drive wheel circuit is controlled to prevent each drive wheel from slipping. The master cylinder isolation valve closes in order to isolate the master cylinder from the rest of the hydraulic system. The prime valve then opens in order to allow the pump to accumulate brake fluid in order to build hydraulic pressure for braking. The drive wheel inlet and outlet solenoid valves then open and close in order to perform the following functions
* Pressure hold
* Pressure increase
* Pressure decrease
=====================================
so sayeth the manual ......
Traction Control System (NW9)
When drive wheel slip is noted when the brake is not applied, the EBCM will enter traction control mode.
First the EBCM requests the PCM to reduce the amount of torque to the drive wheels via the requested torque signal circuit. The PCM reduces torque to the drive wheels by retarding spark timing and turning off fuel injectors. The PCM reports the amount of torque delivered to the drive wheels via the delivered torque signal circuit.
If the engine torque reduction does not eliminate drive wheel slip the EBCM will actively apply the drive wheel brakes. During traction control braking, hydraulic pressure in each drive wheel circuit is controlled to prevent each drive wheel from slipping. The master cylinder isolation valve closes in order to isolate the master cylinder from the rest of the hydraulic system. The prime valve then opens in order to allow the pump to accumulate brake fluid in order to build hydraulic pressure for braking. The drive wheel inlet and outlet solenoid valves then open and close in order to perform the following functions
* Pressure hold
* Pressure increase
* Pressure decrease
=====================================
so sayeth the manual ......
Racer
Joined: Apr 2007
Posts: 355
Likes: 0
From: Dayton Ohio
From the Service Manual .......
Traction Control System (NW9)
When drive wheel slip is noted when the brake is not applied, the EBCM will enter traction control mode.
First the EBCM requests the PCM to reduce the amount of torque to the drive wheels via the requested torque signal circuit. The PCM reduces torque to the drive wheels by retarding spark timing and turning off fuel injectors. The PCM reports the amount of torque delivered to the drive wheels via the delivered torque signal circuit.
If the engine torque reduction does not eliminate drive wheel slip the EBCM will actively apply the drive wheel brakes. During traction control braking, hydraulic pressure in each drive wheel circuit is controlled to prevent each drive wheel from slipping. The master cylinder isolation valve closes in order to isolate the master cylinder from the rest of the hydraulic system. The prime valve then opens in order to allow the pump to accumulate brake fluid in order to build hydraulic pressure for braking. The drive wheel inlet and outlet solenoid valves then open and close in order to perform the following functions
* Pressure hold
* Pressure increase
* Pressure decrease
=====================================
so sayeth the manual ......
Traction Control System (NW9)
When drive wheel slip is noted when the brake is not applied, the EBCM will enter traction control mode.
First the EBCM requests the PCM to reduce the amount of torque to the drive wheels via the requested torque signal circuit. The PCM reduces torque to the drive wheels by retarding spark timing and turning off fuel injectors. The PCM reports the amount of torque delivered to the drive wheels via the delivered torque signal circuit.
If the engine torque reduction does not eliminate drive wheel slip the EBCM will actively apply the drive wheel brakes. During traction control braking, hydraulic pressure in each drive wheel circuit is controlled to prevent each drive wheel from slipping. The master cylinder isolation valve closes in order to isolate the master cylinder from the rest of the hydraulic system. The prime valve then opens in order to allow the pump to accumulate brake fluid in order to build hydraulic pressure for braking. The drive wheel inlet and outlet solenoid valves then open and close in order to perform the following functions
* Pressure hold
* Pressure increase
* Pressure decrease
=====================================
so sayeth the manual ......
Safety Car
Joined: Aug 2000
Posts: 4,933
Likes: 30
From: San Rafael CA
"Pumping" the brakes is usually a function of the Anti-Lock Brake System (ABS) ..... which is a completely different function than the others the EBCM performs ...
Traction Control communicates with the engine as part of its function (and controls rear braking only) .... Active Handling can use a single brake caliper in the performance of its function (which you can't do stepping on the brake pedal) ... and other functions such as DRP (Dynamic Rear Proprtioning) and RSC (Rear Stability Control) also are functions that control portions of the brake system as compared to your limited control of either all calipers, or none, from the brake pedal.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
You can play in " OFF " mode! It completely shuts off Active Handling and Traction Control,,,,But,,,, if you think that your better than the computer be my guess to use it. 
There are time when driving with the system in the OFF mode is appreciate but, for the majority of people on the highway, they shouldn't do that!
If your car is equipped with Active handling COMPETITION Mode is very cool!
I don't think that you can shut off the anti lock brakes unless you disable the EBTCM.
BC
There are time when driving with the system in the OFF mode is appreciate but, for the majority of people on the highway, they shouldn't do that!
If your car is equipped with Active handling COMPETITION Mode is very cool!
I don't think that you can shut off the anti lock brakes unless you disable the EBTCM.
BC
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With TC off the, azz end of the car frequently tries to pass you on the right. 
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Joined: Oct 2004
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From: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
You can play in " OFF " mode! It completely shuts off Active Handling and Traction Control,,,,But,,,, if you think that your better than the computer be my guess to use it.
There are time when driving with the system in the OFF mode is appreciate but, for the majority of people on the highway, they shouldn't do that!
If your car is equipped with Active handling COMPETITION Mode is very cool!
I don't think that you can shut off the anti lock brakes unless you disable the EBTCM.
BC
There are time when driving with the system in the OFF mode is appreciate but, for the majority of people on the highway, they shouldn't do that!
If your car is equipped with Active handling COMPETITION Mode is very cool!
I don't think that you can shut off the anti lock brakes unless you disable the EBTCM.
BC
You are correct on the ABS staying on Bill.
I personally shut everything off when I'm on the road course, it has improved my lap times substantially, but for street use, I'm with you. Leave it on or in comp mode.
Instructor
Joined: Aug 2007
Posts: 185
Likes: 2
From: Bay City Texas
Burning Brakes
Joined: Feb 2007
Posts: 1,211
Likes: 4
From: Vancouver B.C.
Don't forget that (especially with an automatic) there is torque management even when traction control is not engaged. It alters timing and fuel to lower torque with gear changes to reduce stress on the drivetrain.
