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What is function of trac on/off control? What is best setting?

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Trac is short for Traction. In english and easy terms on older cars only one wheel was used for forward motion..on newer cars (mid 70's and later) they have dual traction whereas both rear or front wheels provide motion from engine. With even newer cars 1995 and forward many manufacturers began installing intelligent or positive traction. This means that the car can sense when one of those wheels is losing grip and transfer more of the engine output and torque to the other wheel. They did this so if one wheel was on an ice patch but the other wasnt it would still move, etc, etc. Your car, and many others, gives you a button to decide if you want the engine computer to monitor the wheels and automatically do this for you or if you want to turn off the monitoring and have the power to both wheels be the same. You should run with traction control on during normal operation. If you are in deep snow or other conditions you can turn it off to get more force out of wheels to get unstuck, etc.

Posted on Jun 05, 2010

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1 Answer

How do i reset my traction control


Is your trac light lit ? If so it has a problem an till it is fixed , you can't reset it. Need to have it checked for DTC'S - diagnostic trouble codes .
If the ABS control module detects a malfunction, it will disable TCS and will command the BCM to turn the TRAC LED Off. The driver can also disable TCS, if desired, by depressing the TRAC switch. When the driver depresses the TRAC switch, the ABS control module will disable TCS and will command the BCM to turn the TRAC LED Off.
DTC C0276 TCM Traction Control Not Allowed
DTC C0275 or C0276
The TCM sends a serial data message to the electronic brake control module (EBCM) indicating that torque reduction is temporarily not allowed.
DTC C0550
DTC C0896
The electronic brake control module (EBCM) is required to operate within a specified range of voltage to function properly. During antilock brake system (ABS) and traction control system (TCS) operation, there are current requirements that will cause the voltage to drop. Because of this, voltage is monitored out of ABS/TCS control to indicate a good charging system condition, and also during ABS/TCS control when voltage may drop significantly. The EBCM also monitors for high voltage conditions which could damage the EBCM.

Oct 16, 2015 | 2004 Saturn VUE

1 Answer

Why wont my jep go into 4 wheel drive when I pull th lever?


which system?
we cant guess what is In YOUR CAR, ever.
you must SAY. or RTM, in the glove box.
and why are you using 4wd on dry pavement, now>?


4WD: Select-Trac (or older Select-Drive has a slip coupling too, NP129/229) is AWD in that, "the "4Hi" setting the drive shafts were coupled together using a viscous-type coupler " this anti wind up slipper"
Watch out for exception 1: Select-Trac NP228 based jeeps, it does not have a viscous-type limited-slip coupling. It was used briefly in 1986.
Quada-Trac is full time 4WD (not in lock mode) has a real center differential to shift torque between front and rear. This is the best system , not just a slip clutch as above. Then went BACK to the slipper in 1980. (odd huh?) Up to 1998.
Quadra-Trac-II "4-All Time", "N" or neutral, and "4-Lo". In "4-All Time", torque is applied to the rear wheels under normal driving conditions.
If the rear axle starts rotating at a significantly higher rate than the front axle, hydraulic pressure builds up in the gerotor oil pump and causes the clutch pack, to progressively transfer torque to the front axle, until both axles return to the same speed
Quadra-Trac I was introduced in 2004-10, same as above but is automatic with no driver controls ,like above.
The Quadra-Drive system was introduced in 1999 and is based on the Quadra-Trac II system but adds limited slip differentials (the best full time system ,with great traction to all wheels all the time) 1999 to 04.
Quadra-Drive-II has electronic limited slip differentials or ELSDs 2005 up.

Aug 01, 2014 | 2006 Jeep Grand Cherokee

1 Answer

Why Abs &antislipper &spark light on?! Chrysler Pacifica 2004?


ABS and Trac control fault,have it scanned for faults to follow diagnose procedure for that fault Trac uses the ABS functions in the same module.

May 28, 2014 | Chrysler Pacifica Cars & Trucks

1 Answer

I took out my battery due to freezing and when I put it back in the 4x4 hi and low do not work and Niether will my advance trac


newer 4x4's have all their settings controled electronically, removal of the battery may confuse these settings
probs best to take it to a mechanic

Dec 05, 2012 | Cars & Trucks

1 Answer

My ABS and trac off light is on, what does that mean?


Hello anber...the "Trac OFF" light comes on when there is a malfunction in the ABS because the traction control system uses the ABS sensors and other components to apply brakes to the slipping wheel so that the other wheel will get some power. Not as good as a limited-slip diff, but better than nothing. With the ABS reporting a fault, the Traction Control cannot function, and its computer disables it--hence the light. Fixing the ABS should fix the Trac problem. I would start by checking the sensors and making sure the master cylinder is full of brake fluid. I hope this helps.

Jul 31, 2011 | 1999 Chrysler Concorde

1 Answer

My trac light says trac off, and my abs light is on. what does that mean? I have a 1999 grand am Pontiac.


the trac light is the traction control, the abs light means the antilock brake system is not functioning properly. the trac control is no issue. the abs will not cause the brakes to fail but they will lock instead of pulsing.

Mar 31, 2011 | Pontiac Grand Am Cars & Trucks

1 Answer

Where is the traction control switch located on a 99 oldsmobile alero?


LOOK FOR ETS BUTTON ON THE CENTER OF THE CONSOLE.THE INDICATOR LIGHT WILL TURN OFF BUT LONG AS CURRENT NEED TO LIMIT WHEEL SPIN THE TRAC LIGHT WILL REMAIN ON.TAKE VECHICLE TO GARAGE OR DEALERSHIP.HAVE THEM SCAN THE ABS AND TRAC CONTROL SYSTEM.MOST OF THE TIME A BAD WHEEL SENSOR WILL SET OFF TRAC WARNING LIGHT.

Mar 05, 2011 | 1999 Oldsmobile Alero

1 Answer

What is the trac botton


This is the button that disables the traction control system. I don't believe that it can be turned fully off however, and that this simply functions to limit the traction control. It's best to just leave it alone unless you want to spin your wheels.

Jul 29, 2010 | 1999 Dodge Caravan

1 Answer

I heard a loud pop or something then my dash said trac off and my engine light came on. Now my car is shaking really bad with a loud noise and a faint smell of gas.


On applications with traction control, there is a switch to deactivate the system, which is normally enabled any time the ignition is turned on. TRAC ON and TRAC OFF lamps inform the driver of system status. The controller may deactivate the traction control system temporarily after it has been engaged for a certain period of time to prevent heat buildup in the brake linings and possible brake fade. ABS braking is not affected by the status of the traction control function. In your case it is the Anti Lock Brake system. You have to take it to a shop and have the antilock brake system checked with some special tools.

Jan 01, 2010 | 2000 Pontiac Sunfire

3 Answers

2007 FORD EXPLORER SPORT TRAC 4X4 Change oil light on


Press and hold the SELECT/RESET
control switch to select SYSTEM
CHECK when “SYSTEM CHECK /
HOLD RESET” is displayed in the
message center. Selecting this
function from the SETUP MENU
causes the message center to cycle through each of the systems being
monitored. For each of the monitored systems, the message center will
indicate either an OK message or a warning message for two seconds.
Pressing the SELECT/RESET control switch cycles the message center
through each of the systems being monitored.

The sequence of the system check report and how it appears in the
message center is as follows:
1. OIL LIFE RESET
2. CHARGING SYSTEM
3. WASHER FLUID
4. DOOR AJAR
5. EXTERIOR LAMP
6. BRAKE SYSTEM
7. PARK BRAKE
8. MILES TO EMPTY
9. FUEL LEVEL LOW (will only display if 50 miles or less to empty)
To reset the oil monitoring system to 100% after each oil change
[approximately 5,000 miles (8,000 km) or 180 days] perform the
following:
1. Enter SYSTEM CHECK to display
“OIL XXX% RESET IF NEW”.
2. Press SELECT/RESET control
switch to display “HOLD RESET IF
NEW OIL”.
3. Press and hold the
SELECT/RESET control switch for
more than 2 seconds. Oil life is set
to 100% and “OIL CHANGE SET TO
100%” is displayed.

Apr 02, 2009 | 2007 Ford Explorer Sport Trac

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