Recap of the SAI circuit
09-08-2011, 05:04 PM
#3
If you have issues with Secondary Air Injection ports being blocked or you want to remove the entire SAI system from your '96 - '98. '95s have the system but the ECU does not check if the system is working correctly.
The blocked ports issue shows up as OBD errors:
P0410 - Secondary Air Injection System: Malfunction
P1411 - Manufacturer specific code
The blocked ports issue shows up as OBD errors:
P0410 - Secondary Air Injection System: Malfunction
P1411 - Manufacturer specific code
09-08-2011, 06:01 PM
#5
Addict
Rennlist Member
Rennlist Member
This looks interesting. I'm curious if you need to do this before a CEL is tripped or if it can be done afterwards, clear the CEL with my OBDII code reader and then still get through emissions.
The following users liked this post:
M. Schneider (11-20-2023)
09-08-2011, 07:25 PM
#7
Instructor
Interesting solution.
Is there a way through SW to just 'ignore' this fault code so it doesn't register at all? There is no real drivability concern, just your CATs are not getting as hot as they could if they were getting more fresh air at startup. I vaguely remember back from my BMW days that there seemed to be a SW fix for some of those guys who also suffered from clogged SAI issues. Some companies offered it as part of a chip tune. I think they called it a "Carbon Ignore" or something like that. Granted, my coding knowledge is very limited, but it seems reasonable that you could edit it to just ignore a particular code. Of course there is the whole 'legality' of such a solution, but if it is for 'off road use only', maybe it will be OK.
Is there a way through SW to just 'ignore' this fault code so it doesn't register at all? There is no real drivability concern, just your CATs are not getting as hot as they could if they were getting more fresh air at startup. I vaguely remember back from my BMW days that there seemed to be a SW fix for some of those guys who also suffered from clogged SAI issues. Some companies offered it as part of a chip tune. I think they called it a "Carbon Ignore" or something like that. Granted, my coding knowledge is very limited, but it seems reasonable that you could edit it to just ignore a particular code. Of course there is the whole 'legality' of such a solution, but if it is for 'off road use only', maybe it will be OK.
The following users liked this post:
M. Schneider (11-20-2023)
Trending Topics
09-08-2011, 08:08 PM
#8
I have yet to see a software solution in person. There was a rennlister who posted a friend paid around $1000 to reprogram the ECU to ignore the fault. There is a company called TurboWerx saying for a year that they were coming out with a ECU add-on to ignore the error for $400. This circuit was $10 which is for "testing and educational only". 
The following users liked this post:
M. Schneider (11-20-2023)
09-08-2011, 08:41 PM
#9
Instructor
I certainly think this HW solution has merit. Hard to say no to $10.
Still, it would seem there should be some kind of SW fix possible. Granted, I doubt it would be $10, but it would be totally stealth as long as it didn't throw anything else off. Given a lot of folks go the chip route anyway, adding this 'SAI ignore program' while you're at it seems reasonable.
Please forgive my ignorance here, but don't ROW cars ignore the SAI since it is not used? What if someone swapped in one of those ECUs? A lot of the OBDII codes are generic so it seems plausible on the surface although i'm sure there is some devil in the details. On that note, what are the major differences between a ROW and US ECU? Perhaps some different level of tune due to the octane ratings? What else constitutes the difference? Would a US car run if a ROW ECU was swapped in and nothing else changed?
Still, it would seem there should be some kind of SW fix possible. Granted, I doubt it would be $10, but it would be totally stealth as long as it didn't throw anything else off. Given a lot of folks go the chip route anyway, adding this 'SAI ignore program' while you're at it seems reasonable.
Please forgive my ignorance here, but don't ROW cars ignore the SAI since it is not used? What if someone swapped in one of those ECUs? A lot of the OBDII codes are generic so it seems plausible on the surface although i'm sure there is some devil in the details. On that note, what are the major differences between a ROW and US ECU? Perhaps some different level of tune due to the octane ratings? What else constitutes the difference? Would a US car run if a ROW ECU was swapped in and nothing else changed?
The following users liked this post:
M. Schneider (11-20-2023)
09-09-2011, 12:39 AM
#10
I certainly think this HW solution has merit. Hard to say no to $10.
Still, it would seem there should be some kind of SW fix possible. Granted, I doubt it would be $10, but it would be totally stealth as long as it didn't throw anything else off. Given a lot of folks go the chip route anyway, adding this 'SAI ignore program' while you're at it seems reasonable.
Please forgive my ignorance here, but don't ROW cars ignore the SAI since it is not used? What if someone swapped in one of those ECUs? A lot of the OBDII codes are generic so it seems plausible on the surface although i'm sure there is some devil in the details. On that note, what are the major differences between a ROW and US ECU? Perhaps some different level of tune due to the octane ratings? What else constitutes the difference? Would a US car run if a ROW ECU was swapped in and nothing else changed?
Still, it would seem there should be some kind of SW fix possible. Granted, I doubt it would be $10, but it would be totally stealth as long as it didn't throw anything else off. Given a lot of folks go the chip route anyway, adding this 'SAI ignore program' while you're at it seems reasonable.
Please forgive my ignorance here, but don't ROW cars ignore the SAI since it is not used? What if someone swapped in one of those ECUs? A lot of the OBDII codes are generic so it seems plausible on the surface although i'm sure there is some devil in the details. On that note, what are the major differences between a ROW and US ECU? Perhaps some different level of tune due to the octane ratings? What else constitutes the difference? Would a US car run if a ROW ECU was swapped in and nothing else changed?
Check out the link in my sig if you're interested in the ECU difference between ROW and US.
Cheers,
Joe
The following users liked this post:
M. Schneider (11-20-2023)
09-09-2011, 12:38 PM
#13
"Still, it would seem there should be some kind of SW fix possible."
Not really, without a MAJOR redesign (patch) in the firmware coding,
and not just changing cell entries like the Mickey Mouse so-called tuners
do! This would require a lengthly dis-assembly of the 993 DME ECM
firmware and redesign of OBDII firmware.
Remember, besides the actual test, the cycle flag for the SAI test must
be set or in the end none of the readiness codes (monitors) will be set
to allow an emissions test to begin at the smog station, i.e. readiness
codes ONLY show full completion when all tests have fully completed
successfully.
Read here for more info: http://www.systemsc.com/codes.htm
Not really, without a MAJOR redesign (patch) in the firmware coding,
and not just changing cell entries like the Mickey Mouse so-called tuners
do! This would require a lengthly dis-assembly of the 993 DME ECM
firmware and redesign of OBDII firmware.
Remember, besides the actual test, the cycle flag for the SAI test must
be set or in the end none of the readiness codes (monitors) will be set
to allow an emissions test to begin at the smog station, i.e. readiness
codes ONLY show full completion when all tests have fully completed
successfully.
Read here for more info: http://www.systemsc.com/codes.htm
09-14-2011, 02:01 AM
#14
Pro
Join Date: Jun 2007
Location: Redmond, WA
Posts: 628
Likes: 0
Received 0 Likes
on
0 Posts
I got my parts from Jameco and I'm going to see if I can assemble the circuit board. Looks pretty simple. I have had the CEL for about 2 years due to the SAI. Tried cleaning the ports but ran into a corroded manifold. If this works, it will be nice to get rid of that yellow light on the dash. I'll try to remember to post some pictures and updates. I'm a mechanical engineer, not electrical, so I will trust you spark chasers you the components all worked out.
