Posted by jimg.allentown on December 03, 2013 at 20:14:56 from (98.115.105.174):
In Reply to: The perfect scam? posted by Goose on December 03, 2013 at 16:52:14:
I guess I'll have to add my little bit to this discussion, and try to seperate some of the myth from fact.
First, let me say that most of what has been said here is not correct - but also not incorrect.
Since the introduction of OBD-2, there has been quite a bit of standardization as mandated by the EPA and NHTSA. One effect is that most vehicles can now be emission tested with a single machine. This also forced manufacturers to include more comprehensive emission monitoring into the on-board computers that run the whole show.
The result is that the computers in use need a cold boot reset to erase codes from them. This is simulated by scan tools when using the erase function. This standard has been carried over into the computers that control the transmission, ABS, Air bags, Traction control, body functions, etc.
One characteristic that comes with the persistent memories in these units is that once a trouble code is generated, it causes the affected system to go into a "default" or "limp" mode until the problem is corrected. An example would be electronically controlled transmissions. Upon setting a trouble code, the transmission will revert to a "limp" mode. On most transmissions, this means that it will lock into an intermediate gear that will give sufficient driveability to get the vehicle off the road. and perhaps to a repair facility. This may well be the case with the door locks. A trouble code most likely started the problem, and pulling the fuse caused a cold reset. This could be (as already stated) a temporary fix that will only last until the trouble code returns.
In some cases, a stray code can occur for any number of reasons. Perhaps the programming is too strict for normal operation under normal conditions. Perhaps some electrical interference was encountered that caused a false code to register. Perhaps even some stray static electricity hit the wiring someplace.
Faulty programming usually will require the computer to be reprogrammed. Recurrent codes require further investigation and diagnosis.
A side note: regarding rich or lean coded that seem to point to oxygen sensors:- Most times, these codes (P0171, P0172, and up to P0176) are caused by something OTHER THAN an oxygen sensor. Most commonly, there is unmetered air entering the intake stream.
Before I fade back into the woodwork and go back to lurking.....my qualifications to speak on this subject are as follows: Over 40 years experience in the automotive field. ASE certified Master Auto technician AND Master Heavy-duty truck technician. Manufacturer trained both Ford and GM training schools for driveability and electronics.
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