greenZ94

Ok, I was switching the ASC on and off while driving. Then it would not turn back on when I pressed the button. Then the check engine light came on. I turned the car off, started it back up and drove then the ASC turned itself off again. I pulled the fuse and now it seems ok, but the check engine light is still on. Did I break something? What components does ASC share with the engine control module??

Thanks

2002Z28SSConv

It could have a bad sensor on one of the wheels, be getting bad readings, shut itself off and threw a code.

greenZ94

Do the 2000 cars hold the code longer than the 1994 models? My 94 used to reset when keyed off, but this one shows check engine from the second you put the key in. If the check engine light goes away will the computer still rempmber what was wrong?

LurkerLS1

Yes. I believe that the computer keeps a log of check codes. Not sure how far back it goes, though.

greenZ94

2002Z28SSConvertable. Good guess, in fact it was the TPS sensor (p0122 code) the description said something like TPS sensor low range. Any idea what would cause this? I started the car today and no check engine light what decides if the check engine light is going to come back on or not? Does the car have to cool or sit for a certain amound of time befoe the idiot light goes off?

2002Z28SSConv

Isn't TPS the Throttle Position Sensor? If so, it's not the same as what I was talking about. If the throttle bump stop looks like it has been ground on, the previous owner probably did the free mod known as the Throttle Bump Stop Mod. He may have ground it too far and at wide open throttle the PCM thinks the sensor is sending a code that is out of range. Otherwise you might have a bad Throttle Position Sensor. There are ways to test a TPS with a digital multimeter or autotap.

See if the code comes back if you floor the gas.

greenZ94

Well, in response to your other post I am driving it !! And I am pretty sure I floor it more than once on every outing (Even though I am trying to get good gas milage) What is the bump stop mod? No the previous owner was like me, a no mod kind of guy, that is part of the reason I bought this car.

2002Z28SSConv

http://www.installuniversity.com/ins..._bump_stop.htm

When you floor the gas, the plate on the side of the throttle body that attaches to the throttle cable comes in contact with a tab on the side of the housing. That's what you are pressing against when you hold the pedal to the floor. Almost all FBody's will stop just short of opening the butterfly (inside the throttle body) to 90 degrees. By grinding the bump stop down you can bring it very close to 90 degrees for better air flow. So they say.

ZZed

It makes sense that the ASR is linked to the throttle. The ASR module is connected to the throttle and does affect TPS. An intermitent light could mean an intermitent problem. I read out of limits or near the edge and flagged it with a light. A "hard hit" would ,mean a real problem requiring attention. The light would stay on. The codes are saved. I think www.installuniversity.com tells you how to clear the code. Check if the TPS is loose and clean the connectors if needed. Now just wait and see.

greenZ94

Sorry, I do not know what a "Hard Hit" is. Do you mean a royaly FUBAR TPS sensor? Are you saying a really bad sensor will keep the "Check Engine" light on till the car is serviced but a "Soft Hit" would reset after the car sat for a long enough time? On this note are there two "Check Engine" modes?? What I mean is the soft hit illuminates the check engine light and that is it but a hard hit puts you into open loop limp home with both fans running etc. ??

Also, why in the heck would GM make a throttle body that did not open up 90° Seems like it would be smarter to give us a smaller TB that opened up all the way DUH.

2002Z28SSConv

They open pretty close to 90 degrees. But some guys look for every little bit of an edge ya know? It's just a little fine tuning. That's all.

99blackSS

So if the ASR isn't working the SES light would come on? My ASR switch and fog light switches are only lighting up after I press them several times and I know the fog lights work no matter if the switch lights up but I have lost control more then usual in the past few days.