trouble codes won't clear

CHEVROLET TAHOE
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DD97HOE
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I have a 97 tahoe 2dr 4wd 5.7 with 140,000 miles. I recently got 2 trouble codes 0719,p102. I know what the codes are but have not been able to clear them. I have replaced the brake switch,maf sensor,harness connector to the maf,air filter,checked the voltage to the maf,most of the vacum lines.is their anything else i can do before i get into the computer? The truck runs fine no hesitation or rough idle. i'm guessing it's somewhere in the electrical system but i don't know where to go from here. the light has come on in the past bwith same codes and have been able to clear them no problem :?:

Thanx for taking the time to read this. any ideas would be great
Aug 2, 2007 at 7:34 AM
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SERVICE WRITER
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Hi,

Not sure how much of a help I can be.

I will relay this: On the po102 code, I know of one that was fixed by replacing the cam sensor and setting the distributor to 0. I don't have the testing info that brought it to this, but I thought it was worth passing along.
Aug 2, 2007 at 7:54 AM
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DPWD23
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if you are just looking to clear the codes, an OBD tool that is able to be programed with vehicle specific information is the best route.
You can usually clear these codes by disconnecting the battery for a predetermined amount of time. I'd play it safe and leave it completely unhoked overnight.
Hope that helps you get the codes cleared for you.
Aug 4, 2007 at 12:54 AM
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SERVICE WRITER
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HEy guys,

30 seconds is the required time for disconnection to clear the codes. However clearing them may be futile. The codes sound like they are not going to go away. Clearing the codes just erases the pcm short term memory heh, kinda like a quick case of alzheimers. The pcm goes through monitor checks that are self tests of a sort for various emission systems or things that will affect emissions anyway. The problem with clearing them is if you opt to take it to shop they have less to work with as they can access the freeze-frame data that shows what the data stream produced at the time of the monitor failure that turns the light on. Some monitors won't run until a particular code is addressed and sucessfully solved. So, clearing those codes if possible may muddy up the situation.....or may not :roll:

Brother Dip: your'e an awsome addition to the forum moderators. I have no clue to the programming lingo you use, but opens up another avenue of understanding :wink:
Aug 5, 2007 at 8:16 AM