SOURCE: abs light is on? 2004 chevy avalanche
what i've seen with the k series chevrolet trucks is that the wheel speed sensors develop corrosion where the sensor mounts to the hub. you can start by taking the sensor out and cleaning off the mounting surface with a wire brush. the process is:
1. raise front of vehicle onto jackstands
2. remove front wheels
3. remove the brake caliper, bracket and rotor on both sides
4. remove wheel speed sensor via 1 torx bolt (be carefull as the corrosion will cause the sensor to "stick" in the hole)
5. clean the mating surfaces with a wire brush so the sensor bolt hole and mounting surface on the hub is shiney again.
6. if you can, pick up a can of rust preventing primer and spray a little on the surfaces to prevent further corrosion
7. let paint dry
8. apply a thin fil, of grease to the sensor and the sensor mounting spot on the hub
9. re-install sensor
10. revers steps 3-1 for re-installation.
*process is the same for both sides.
this was a common problem on the k series trucks.
while your in there it wouldn't be a bad idea to check the sensors wires to make sure they arent broken. let me know if the repair works for you
SOURCE: "Chk Trac light" on 2000 Lincoln Town Car
MAKE SURE TIRES ARE ALL THE SAME SIZE FIRST OF ALL,NEXT MAY HAVE A SPEED SENSOR NOT OPERATING PROPERLY OR BENT OR MISSING EXCITER RING ON FRONT HUB OR REAR AXLE. EITHER WAY THERE IS AN ABS FAULT OR A DIFFERENCE IN WHEELSPEED ON ONE OF THE FOUR WHEELS CAUSING TRAC LIGHT TO ILLUM. VEHICLE THINKS YOU ARE LOSING TRACTION AND APPLYING ABS AND MISFIRING VEHICLE TO SLOW DOWN UNTIL TRACTION IS RECOVERED
SOURCE: 2001 Toyota Sequoia VSC and TRAC OFF lights are on
I did research on line and all indicates that is caused by the YAW RATE SENSOR. It nedds to be replace and adjust. I have the same problem but havent find the time to get to it. When I do I will post it. If you do it before I do please email me with the result at [email protected]
Good luck
SOURCE: the abs and trac lights stay on when the engine is
Something as simple as a different tire size can cause the abs to go
nuts. I even had it where the two tires were the same size. But a
different brand name. Each manufacture has their own tire sizing so not
all tires a equal in size. Even though it says on the side of the tire
that they are the same size.
Sometimes the cooper inside the insulation of the wires going to the sensors corrodes.
Especially on the front units. It reads more ohms than normal but not
open and is very intermittent. However moving the wires my make it work
for a while. That's why replacing bearings seems to fix the problem but
it comes back after a while.
You can test the speed sensors yourself...
Front sensor specs:
956 to 1240 ohms in 41 to 110 degree weather
at least 100mV AC (NOT DC!) volts when hub is spun by hand
Rear sensor specs:
950 to 1300 ohms in 41 to 110 degree weather
At least 100mV AC (NOT DC!) volts when hub is spun by hand
Here
is some information from service bulletins that could be related to the
problem. The traction control, antilock brakes, and tire inflation
monitor all use wheel speed sensor input.
This first bulletin seems like it could be the problem because engine movement is involved:
GM Corporate Bulletin 00-06-04-049B
This Bulletin covers a problem that can cause multiple failures, one of
which is an Antilock brake problem, and covers 2000-2003 Impala and
Monte Carlo built prior to 2/03.
Check to make sure the wiring harness adjacent to the AC
accumulator/dryer is not rubbing against the ac accumulator chaffing
through the insulation of the wires in the harness.
GM Corporate
Bulletin 03-05-25-008 overview:
GM front wheel speed sensor harness replacement - 2001-2003 Buick
Century, Regal; 2001-2003 Chevrolet Impala, Monte Carlo; 2001-2002
Oldsmobile Intrigue; 2001-2004 Pontiac Grand Prix
This bulletin is about inspecting the harness going to the front wheel
speed sensor for wear from contact with front suspension parts.
Repair harnesses/leads are available that can be spiced onto the main harness.
2001-2003 impala & Monte Carlo – Right side - 10340313
2001-2003 impala & Monte Carlo – Left side - 10340314
SERVICE BRAKES, HYDRAULIC:ANTILOCK:ABS WARNING LIGHT
• TSB #030525008 -- INTERMITTENT/CONSTANT ANTI-LOCK BRAKING SYSTEM
(ABS) MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATED. *TT (NHTSA ID
#10004719, OCTOBER 01 2003)
Hope helped.
SOURCE: 2004 Cavalier, Service light, ABS light, Trac Off light
It is the wheel speed sensor jumper harness more than likely on the driver side. They replaced the orginal with a newer better one but never issued a recall.
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