Catalyst & Evap not ready, need help!
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Catalyst & Evap not ready, need help! So I can't seem to get my truck to pass emissions due to the fact the catalyst and evap systems come up as not ready.
My truck is a 2004 that originally came with a 4.8L but now has a 6.0L. I also have aftermarket cats which I put on over a year ago. I haven't had any DTC's since I changend the cats so I don't think they are causing any problems.
I have completed the GM drive cycle many times as per the recommendation but I still won't pass.
Any suggestions would be greatly appreciated.
My truck is a 2004 that originally came with a 4.8L but now has a 6.0L. I also have aftermarket cats which I put on over a year ago. I haven't had any DTC's since I changend the cats so I don't think they are causing any problems.
I have completed the GM drive cycle many times as per the recommendation but I still won't pass.
Any suggestions would be greatly appreciated.
So I can't seem to get my truck to pass emissions due to the fact the catalyst and evap systems come up as not ready.
My truck is a 2004 that originally came with a 4.8L but now has a 6.0L. I also have aftermarket cats which I put on over a year ago. I haven't had any DTC's since I changend the cats so I don't think they are causing any problems.
I have completed the GM drive cycle many times as per the recommendation but I still won't pass.
Any suggestions would be greatly appreciated.
My truck is a 2004 that originally came with a 4.8L but now has a 6.0L. I also have aftermarket cats which I put on over a year ago. I haven't had any DTC's since I changend the cats so I don't think they are causing any problems.
I have completed the GM drive cycle many times as per the recommendation but I still won't pass.
Any suggestions would be greatly appreciated.
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I tune with CMR so I have access to those parameters. My question is what number do I put in nest to the OBD II tests that I need to modify?
I am not sure what you are asking (numbers to put in next to OBDII tests?), but if you'll set the processing enablers for DTC P0420, P0430, P0440, P0442, P0443, P0446, P0449, and P1441 to "not reported" or "X", the EPA tests should all report as passed/completed.
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I found every code but P0440 and P1441.
Last edited by Turbo 6.0; Jan 13, 2009 at 12:00 AM.
There are four conditions: not reported, non-emissions, emissions-related one trip failure, and emissions-related two trip failure. I would guess that the numbers 0-3 correspond in that order, or in the opposite order.
What do you have for those codes currently? If you can't tell, try all zeroes or all threes. If you have the ability to check the readiness tests before going in for inspection, the guess-and-check method isn't so bad.
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Sorry, I thought CMR might have been a shop or something you had access to. My mistake.
There are four conditions: not reported, non-emissions, emissions-related one trip failure, and emissions-related two trip failure. I would guess that the numbers 0-3 correspond in that order, or in the opposite order.
What do you have for those codes currently? If you can't tell, try all zeroes or all threes. If you have the ability to check the readiness tests before going in for inspection, the guess-and-check method isn't so bad.
There are four conditions: not reported, non-emissions, emissions-related one trip failure, and emissions-related two trip failure. I would guess that the numbers 0-3 correspond in that order, or in the opposite order.
What do you have for those codes currently? If you can't tell, try all zeroes or all threes. If you have the ability to check the readiness tests before going in for inspection, the guess-and-check method isn't so bad.
I will put a 3 in the codes you mentioned so that the code is not reported. All of those codes currently have a 1 so I assume it's a one trip faliure.
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0=MIL ON after first key on failure 1=MIL ON after second key on failure 2=NO MIL Light 3=No Error Reported
This is what I understand the DTC functions to be, but I always just change the stock value to a 3 to disable the function.
Ryan
This is what I understand the DTC functions to be, but I always just change the stock value to a 3 to disable the function.
Ryan
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you will want 3 for EVERYTHING. MIL status, DTC... make sure you get EVERYTHING. I ran into this and had to find those stragglers that my eyes didn't catch the first time
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Thanks again to everyone that helped!
