Resetting OBDII

[johnfin]

02' transam, if the battery is disconnected for some time will the codes be cleared?

[JayTA98]

yes some of them. If the code comes back it will light up right away. Which code is it?

[SuperSSguy]

In my case when i switch from my DS Predator Performance tune back to the stock tune (for emissions test)or visa versa The obdII will reset the emissions monitors. Some are continious some non-continious monitors.Ive never had a it throw any codes though. There is a specific driving pattern per make and model to reset them found on the net @ GM related sites. I have a hand held device that plugs into the obd port that tells me which monitors are set or not. As long as your not going in for an emissions teat you should be ok and the monitors will reset themselves in time.

[SuperSSguy]

OOPPs! Sorry guys i didnt read your question right... Oh so i guess your throwing codes now and want to know if disconnecting the battery will clear them?...Yes it will but depending on the codes they may just pop back up again. I had one pop back after only 12 miles of driving.arggghh!!Like JayTA98 says. To me its best to invest in a code reader and try to correct the problem if possible This way youll always have a reliable way of reading and erasing trouble codes, I bought one for 57 dollars.

[2002ssslp]

Post your codes.

[johnfin]

171 & 174, lean banks 1 & 2. I cleaned the MAF and tried to find the PCV to see if its leaking around the connection but I think its missing. I was told it should be near the front of the engine.

[Redrokit8]

OOPPs! Sorry guys i didnt read your question right... Oh so i guess your throwing codes now and want to know if disconnecting the battery will clear them?...Yes it will but depending on the codes they may just pop back up again. I had one pop back after only 12 miles of driving.arggghh!!Like JayTA98 says. To me its best to invest in a code reader and try to correct the problem if possible This way youll always have a reliable way of reading and erasing trouble codes, I bought one for 57 dollars.

You bring up a good point. Anyone recommend a reliable & inexpensive reader? I'm wearing my welcome out at my local performance garage.
Thank you.

[JayTA98]

171 & 174, lean banks 1 & 2. I cleaned the MAF and tried to find the PCV to see if its leaking around the connection but I think its missing. I was told it should be near the front of the engine.

Is this your vehicle? It sure looks like is missing the valve but in an 2002 the PCV valve tubing is different. Is more like an U shaped and it goes down to the valley cover right underneath in that pic. Is the car completely stock? That setup looks more from the 98-99 were the valve is further back inline.

[JayTA98]

You bring up a good point. Anyone recommend a reliable & inexpensive reader? I'm wearing my welcome out at my local performance garage.
Thank you.

i use the actron ones and i have been happy with them. I bought my 1st one from ebay for $40. I sold it last year and upgraded to another and I got it from a member for $120 if I remember correctly.

[2002ssslp]

A 2002 Trans Am should have the PCV system right up front near the passenger valve cover.

[myls1]

how long do you keep the battery disconnected to clear the codes.

[JayTA98]

A 2002 Trans Am should have the PCV system right up front near the passenger valve cover.

I have to agree with you on this one. I'm thinking of the U shaped hose but that's only when the LS6 valley cover has been equipped. The PCV valve should be right were that strap is. Did you check that tube all the way back? Is it a straight piece of tube all the way back? If it is then yes it has been deleted.

[JayTA98]

how long do you keep the battery disconnected to clear the codes.

i will do at least 20 mins. Sometimes is less.

[myls1]

disconnected both cables?

[JayTA98]

i only disconnect the negative

[johnfin]

The hose is straight and goes all the way back. I do see some metal elbows on the front of the covers but they are not PCV valves, just elbows for hose connections. I checked the rear 2 hose connections (nice and easy to get at NOT!!) and they look ok, no pcv. What would happen if you ran a car without one?

[98TransAmWs-6]

i will do at least 20 mins. Sometimes is less.

A quicker way to clearing the codes is removing the pcm/bat fuses for about 30 seconds and put them back in and the codes are cleared if you don't have a code reader that can clear codes.

[SuperSSguy]

You bring up a good point. Anyone recommend a reliable & inexpensive reader? I'm wearing my welcome out at my local performance garage.
Thank you.

I bought (online) a * AutoLink (AL309) Professional obd-II code reader/scan tool for around $ 57.00 bucks! They do have one thats a little more advanced,that i wanted after but for what i needed it for and price its great! (so do your research for the one you want) Autel.us | Car & Vehicle Diagnostic equipment | Engine ODB Software | MaxiDas DS780 or Amazon search. or I have a DiabloSport Predator hand-held tuner/scan tool also. Although it has many power adders etc it cannot show emissions monitors!

[SuperSSguy]

disconnected both cables?

I remember reading something about turning your headlamps on etc? Before you do the dis-connect.

[2002ssslp]

how long do you keep the battery disconnected to clear the codes.

10 or 15 minutes. I would get a cheap code reader so you do not have to keep resetting the radio.