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Old 04-06-2016, 08:33 PM   #5
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 43,523
 

2003 L-Series 3.0L Sedan
Default Re: ABS Light on but no OBDII Codes found

Traction control is ABS but used in the opposite sense - ABS prevents wheels from locking up by releasing and braking at high speed just short of locking any brake as long as high pedal pressure is applied and a wheel or wheels are not in contact with a surface to slow it down. Traction control does the opposite by stopping a wheel from spinning up compared to the other drive wheel by using the same abs technology without a driver applying brakes. The abs unit applies braking to the wheel that spins faster than the wheel having traction. the reason the abs light is ON without a check engine light is as explained before; abs is completely self contained and indicates its status with one light, the ABS light.

1-OFF = ignition is OFF or ignition is ON, engine running and car is moving above 5 mph/8 km/h.

2-ABS flashing = abs actively cycling at high speed one or more wheel brake to prevent brake lockup to allow as much traction as possible while slowing the car down.

3-ON = ABS detected a failure during power up self tests(@ignition ON time) or while driving and completely disables itself from interfering with braking. Thiis means ABS is no longer available but does not prevent brakes from operating as they always do.

As you found out, without abs the brakes are still working and can lock up any wheel(s) on slippery uneven surfaces.

Try Autozone's reader or consider a walk around careful inspection of; wiring to each wheel speed sensor, sensors and reluctors. At home diagnosing with error codes read by A-z or visual examination of ABS components are the least costly methods. Paying GM or brake shop capable of decoding and repairing abs will cost more unless asked to perform diagnostics and provide a report for you to make any repairs.

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