Traction control and ABS

[GMFreak]

I'll look in my manual again but it's in there as being a rotational sensor on the hub that if over a specified amount of time varies from the average of all 4 wheels, will set off the tire pressure light. It's not indicating that there's actual low pressure or anything just a difference in speed that may be caused by low pressure. I may be wrong though. I'll have to look it up.

[Mike Jung]

Originally Posted by polo77

I think it actually is in the system because i had a bad wheel speed spensor both lights were on, and I got a flat tire while driving and light never came on. Never came on while the abs n trac off lights were on, but as soon as I replaced the bad hub the tire pressure light came on within 5 miles of driving. I could be wrong maybe just a coicidence

Originally Posted by GMFreak

I didn't know so that's why I asked. I had mine come on in the winter, but all tires were still at their normal pressure. Thought it might have been due to wheelspin on slippery roads.

Originally Posted by gectek

well the tire press monitor was supposed to be just for the Bonneville, and that was all the way back to 01...so thats at least what GM says...and im only sticking to pontiac on that, since it was also in the impala and maybe later the GP, i cant find anything on that. if your tire press system light came on, then it is a glitch.

the tire press monitors for any of Gm are either 2 designs, either in the valve stem or on the inside of the rim placed there by a strap...the GA had neither, so there you go, and also it requires a tire press module, which the ga doesnt have either

Originally Posted by GMFreak

I'll look in my manual again but it's in there as being a rotational sensor on the hub that if over a specified amount of time varies from the average of all 4 wheels, will set off the tire pressure light. It's not indicating that there's actual low pressure or anything just a difference in speed that may be caused by low pressure. I may be wrong though. I'll have to look it up.

YES, some '99 GA's (later models like the GAGT) with the 3400-series engines had the tire pressure monitor system.
(Some Oldsmobile Alero's with the 3400-series engine also had this feature.)

It DID use the ABS speed sensors (that are in the wheel hubs) to determine a low tire pressure situation.

Originally Posted by BMOBYLE

...the PCM measures the difference in the abs sensors and if they are off a certain spec going a consistant speed for a certain amount of time the pcm sees a low tire pressure. I guess a flatter tire spins slower than a FULLY inflated
tire. It had worked a couple times for me and each time it came on it was RIGHT. My friend that works at PONTIAC told me the tire has to be about 10 to 18psi lower than the others though.

Also see: Tire pressure monitor
(About spinning the tires in the snow, see the above ^ link.)

[gectek]

well i could only check back as far 01 on the ga, i just thought they didnt have it. i know mine doesnt and my friends 01 doesnt either, and i checked GM and they only show for the bonne, so thats what i went off of. also on the models after the 02 or 03 year they took out the reset button on the IP fuse panel, so you wouldnt be able to reset it like that anyway, it would be through the gas pedal

[iceman]

argghhh... does anyone read the stickies any more?