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NC Inspection


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linwood
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Jan 29, 2010, 9:37 PM

Post #1 of 16 (3145 views)
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NC Inspection
I have a 1997 chev 1/2 ton 2 wheel drive truck, 4.3 V6 engine with 182000 miles. I bought the truck about a week ago, so I know very little about it. I Tried to get through the North Carolina inspection and it failed for the following. (Catalyst not ready, 02 sensor heater not ready, and Evaporative system not ready). I do not have the codes, he only gave me the print out from the computer which does not contain the codes. The battery was disconnected before the inspection and the inspector told me to drive it for about 75 to 100 miles and have it reinspected, which I did and it still failed for the same reasons listed above. The check engine lite is not on. He did tell me that in NC it would pass the inspection with any two not ready conditions, but more than two would fail it. Please help if you can.
Thanks
Linwood


Sidom
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Jan 29, 2010, 11:25 PM

Post #2 of 16 (3138 views)
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With the monitors, there is a certain order in which they run. If one of the monitors, for what ever reason doesn't run, then the downstream monitors won't run until the upstream one runs & passes.

I don't do smogs so I would have to look up the order but since the comp uses the O2s to test the cat, I'm pretty sure the O2 monitor would have to pass before the cat monitor could run.

Normally O2s would turn on the SES light but not always. 1st thing to do would be to get the codes pulled to see what systems are having problems. Fix those problems and see if that will get your monitors to run.........






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linwood
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Jan 30, 2010, 12:04 AM

Post #3 of 16 (3135 views)
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Thanks a lot, I will surely try that.

Linwood


66chevelle903
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Mar 18, 2010, 1:08 AM

Post #4 of 16 (3084 views)
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sounds like the former owners cleared the codes is why it was in non ready mode,you can obtain a drive cycle which helps go through the cycle quicker,driving 75 miles doesnt always work,th pcm goes through as many as 3 tests b4 it checks ready mode,also make sure when u turn ur iginition switch on u see th ses light come on,if th bulb is burned out or been removed ul never know when ul have trouble,plus that will fail the inspection,ive been doing inspections 15yrs.


ratrace2
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Mar 27, 2010, 11:41 AM

Post #5 of 16 (3064 views)
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In Reply To
sounds like the former owners cleared the codes is why it was in non ready mode,you can obtain a drive cycle which helps go through the cycle quicker,driving 75 miles doesnt always work,th pcm goes through as many as 3 tests b4 it checks ready mode,also make sure when u turn ur iginition switch on u see th ses light come on,if th bulb is burned out or been removed ul never know when ul have trouble,plus that will fail the inspection,ive been doing inspections 15yrs.

Hello,

Tell me about the drive cycle regarding the PCM and setting codes and stuff..........

for example, can we get the pcm to cycle manually?

thanks, RR2


Hammer Time
Ultimate Carjunky / Moderator
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Mar 27, 2010, 7:52 PM

Post #6 of 16 (3052 views)
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I have no idea what he's talking about there. I know of no way to hurry up the PCM to go through the drive cycles. It's just a matter of the computer having to see every scenario that it has to test and clear and until it have gone through every situation, it's not going to clear the monitors.
You can get a list of just what the scenarios are and try to drive it through every situation it needs but every car is different.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Sidom
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Mar 27, 2010, 9:56 PM

Post #7 of 16 (3049 views)
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What he talking about is code trip failures...... Some codes require 2 or more successive "trip" failures before a code will set. Most of the manufacturers have a 1 trip mode you can put the PCM into to verify a repair. It for a tech so he can tell in a short time if the repair was successful or not without wasting a bunch of time and gas driving the vehicle.

As far as the drive cycles, they run as quickly as they can, some run right off the bat. The slower ones are the O2s, cat & evap monitors. Those take some time and there is no way to speed them up and if one doesn't pass or complete the "downstream" ones won't run until the 1st one runs & passes...






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ratrace2
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Mar 28, 2010, 8:54 AM

Post #8 of 16 (3043 views)
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In Reply To
What he talking about is code trip failures...... Some codes require 2 or more successive "trip" failures before a code will set. Most of the manufacturers have a 1 trip mode you can put the PCM into to verify a repair. It for a tech so he can tell in a short time if the repair was successful or not without wasting a bunch of time and gas driving the vehicle.

As far as the drive cycles, they run as quickly as they can, some run right off the bat. The slower ones are the O2s, cat & evap monitors. Those take some time and there is no way to speed them up and if one doesn't pass or complete the "downstream" ones won't run until the 1st one runs & passes...

That's it: "drive cycles" & "downstream".

You guys know where I could get a good book that describes the theory, design, functions of these PCM systems.

I bought an "alldata" subscription for my 1998 S10 2.2L but I-- maybe it's me--think the diagrams are kinda crapy, the search is kinda crapy, and it's just not as good as I hoped it would be. Maybe I should go back and get a trusty old Chilton manual.


Also, I would really like to get into something like this:
http://www.hptuners.com/...suite_creditsfaq.php


Sidom
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Mar 28, 2010, 11:49 AM

Post #9 of 16 (3040 views)
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Good question, I will look around & see if I have some info to post.

Alldata is a good info source. I pretty much all the sections there is a "theory & description" of any area. Look around in the powertrain management sections.

When I get back from church I see if I can find some generic info for you






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ratrace2
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Mar 28, 2010, 12:14 PM

Post #10 of 16 (3038 views)
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This is it:
  • "The MIL will turn off after 3 consecutive ignition cycles in which the diagnostic runs without a fault."
  • A history DTC will clear after 40 consecutive warm up cycles without a fault.
  • A scan tool can clear the DTCs.

source: "Alldata).


Hammer Time
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Mar 28, 2010, 9:04 PM

Post #11 of 16 (3034 views)
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This is also from Alldata







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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Sidom
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Mar 28, 2010, 9:36 PM

Post #12 of 16 (3030 views)
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That's exactly what I was looking for...........nice






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ratrace2
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Mar 29, 2010, 10:02 AM

Post #13 of 16 (3021 views)
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In Reply To
That's exactly what I was looking for...........nice

I know, Hammer is one sharp cookie.........


Hammer Time
Ultimate Carjunky / Moderator
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Mar 29, 2010, 8:04 PM

Post #14 of 16 (3017 views)
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Alldata has a lot of good info. You just need to know where to find it.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



ratrace2
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Mar 30, 2010, 7:27 PM

Post #15 of 16 (3006 views)
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In Reply To
Alldata has a lot of good info. You just need to know where to find it.

Yea, right. I'm starting to see that Alldata has it's own system, as do chiltons.
It's like super auto information overload. . . .WOW. That's good though.
I went from nothing to WOW.....give me a month.

I'm getting there. Give me a couple of weeks with the format and I'll be OK.
But, you got'ta admit, there is a ton of stuff in there.....wow...

Thanks so much,........You guys are the best.....


Hammer Time
Ultimate Carjunky / Moderator
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Mar 30, 2010, 7:47 PM

Post #16 of 16 (3000 views)
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Everything in Alldata is from the factory service manuals. They get all their info from the manufacturers. There's a lot there, You just need to learn where they keep it all.




~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.





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