In the past I was always under the impression that it was impossible to pass an OBDII scan emissions test with an SD tune, due to the requirement that the "MAF failure" code be set to force the GM ECU into SD mode.
Is this still true today?
In the past I was always under the impression that it was impossible to pass an OBDII scan emissions test with an SD tune, due to the requirement that the "MAF failure" code be set to force the GM ECU into SD mode.
Is this still true today?
2004 C5 Coupe - MM6
You will be fine. At least that's my experience with emission test tools and for example 2 bar CoS with MAF deleted and proper "MIL at first error" settings.
So how are you deleting the MAF?Originally Posted by Pekka_Perkeles
The process I was aware of was to unplug the MAF (which throws code and forces SD) and set the MIL idicator to not illuminate. This got SD mode and kept the MIL light off, but the SES code was still set (which would cause a failure on an OBDII scan emissions test).
2004 C5 Coupe - MM6
You need to read the help files.
2003 Chevy Silverado Daily Driver, 408 Iron Block,
LS3 Heads/Intake, 231/239 114, 4L80e, Yank SST 3200.
Within the program? I have been through them and have never seen anything talking about forcing SD (unless I'm looking right past it).
2004 C5 Coupe - MM6
You don't have to disconnect the MAF, just set the MAF FAIL HIGH Hz to 0.
Engine Diagnostics->Airflow->MAF Sensor
But that requires leaving the MAF in place....
2004 C5 Coupe - MM6
Did you take the MAF off your car or just disconnect the sensor?
MAF will be removed completely (engine swap into different vehicle).
2004 C5 Coupe - MM6
Never had an issue passing CT emissions with SD.
2002 Z06 corvette. Heads cam. The usual.
So you have your MAF completely removed, running SD, and pass an OBDII scan test?
2004 C5 Coupe - MM6
That is the first step. But you still have to change some dtc's.
Read the help files on this site and check out http://ls1tuningguide.com/index.php. That will give you step by step instructions on how to properly run a SD tune.
2003 Chevy Silverado Daily Driver, 408 Iron Block,
LS3 Heads/Intake, 231/239 114, 4L80e, Yank SST 3200.
Not sure what he looked for, but I got a guy that passes me and the only thing he says was the rear o2's were showing as "not supported" for some odd reason. I've never had an issue passing with the o2 sims in place previously.
2002 Z06 corvette. Heads cam. The usual.
Reply With Quote