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Pontiac Repair/Unwanted ABS activation

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Question
Hi Todd,

Hope you can help me...

I have a 2006 Pontiac Torrent, 2wd, 4wheel ABS 3.4L Vin F
When im just about at a complete stop,the ABS activates,under 5mph ...happens right about as the vehicle stops.
NO ABS light on.....I know it must be a sensor dropping out, but i dont have access to a scan tool to determine which one is dropping out.

Is there any way to determine this without a scan tool?

From your experience, are there any known problems with these that cause this ? I.E. certain hub/sensor?
Any TSBs that you know of?

It doesnt have a worn/noisy bearing so i cant go that route...had an s10 in the past do this but it was an easy diag  since the RF bearing was worn/noisy.

Thanks for any help you can offer

Joe

Answer
Hi Joe:

With out the aid of a scan tool it's pretty hard to find. you have a wheel speeds sensor dropping out. there are a few things you acn try. do a google search and sind the schemaitic for the abs wheel speeds sensors. then unplug the harness at the EBCM (abs cmputer) then with a digital volt ohm meter check the loop for each wheel speeds sensor for resiatnce. the speeds sensors should be between 900-1400 Ohms with the van cold. when you check each sensor crawl under the van and wiggle the wire going to the speeds sensor and see if the reistance changes if it does you have a harness issue ging to that sensor. if you find one that the restance is hi. unplug the sensor by the wheel and check it there and see what you have if it's still hi it's a bad sensor. if it lower at the sensor it's a bad harness. good luck :-)

Pontiac Repair

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Todd Puccio

Expertise

General auto repair,electrical issues,driveability issues,anti-lock brakes,SIR systems,HVAC,engine performance,Gm specific. I have worked at my current dealership since the 1990 model year anything much older than that I have limited exposure to. I do not have very much transmission experience so those question you may want to ask of another expert. When you send me a question let me know the exact make/model/engine and year for the car or suv you have it makes it easier to answer the questions that way. If your happy with the answer I gave you please feel free to Donate. This is a free service to you and I am not compensated at all by this web site. I have 22 years of experience to share with you and my knowledge wasn't free to me. I had to pay for my education.

Experience

Experience in the area: I have been a technician in GM dealerships for over 22 years and I am a ASE master technician. I work at a Buick and GMC truck store Previously I worked at a Pontiac GMC store for 18 years. I Served a a lead technician when dealership was on a team system. I just recently moved to a Buick,Hummer,Saab Store when my franchise was purchased by this dealership. Organizations: ASE master technician

Organizations
ASE

Education/Credentials
Education/Credentials:High school diploma,2 year vocational school degree 2 year college degree. Associates degree in applied sciences (auto technology)Awards and Honors: GMC master technician

Awards and Honors
Master GMC truck technician Master ASE technician in 9 categories

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