Sd Tuning/MAF Question
Thread Starter
Le Mans Master
Joined: Jun 2006
Posts: 6,979
Likes: 31
From: Wichita KS
Sd Tuning/MAF Question
So I found out my tuner SD tuned my car which I have no problem with (the car hauls a$$) but I would like to know if my car still uses inputs from my MAF? (its still connected) Cause if not I am going to remove the screen to open it up a tad more.
Melting Slicks
Joined: Jul 2006
Posts: 3,356
Likes: 1
From: Chesapeake Va
If it was left in SD then no, there's no input from the MAF. If he SD tuned it and then dialed in the MAF, then yes, the MAF is active and has input.
Thread Starter
Le Mans Master
Joined: Jun 2006
Posts: 6,979
Likes: 31
From: Wichita KS
Is there a way I can find out but using my HP tuner? Thats what he tuned my car with.
Race Director
Joined: Oct 2002
Posts: 16,477
Likes: 26
From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
Check to see if any/all of these codes are disabled (set to not report, and no MIL)
P0101
P0102
P0103
If they are, car is almost certainly in SD mode. Most tuners put the car in SD mode by purposely causing the MAF to fail, such as changing the high frequency error value to 1hz. What this means is anytime the MAF reports 1hz or more, P0103 is immediately set, and car is then in SD mode. And this is why that code would be turned off.
If you still had the early MAF, you could also check by simply unplugging it. But if you used the integrated IAT on your late model MAF, and no longer have the separate IAT sensor, this won't work.
P0101
P0102
P0103
If they are, car is almost certainly in SD mode. Most tuners put the car in SD mode by purposely causing the MAF to fail, such as changing the high frequency error value to 1hz. What this means is anytime the MAF reports 1hz or more, P0103 is immediately set, and car is then in SD mode. And this is why that code would be turned off.
If you still had the early MAF, you could also check by simply unplugging it. But if you used the integrated IAT on your late model MAF, and no longer have the separate IAT sensor, this won't work.
Thread Starter
Le Mans Master
Joined: Jun 2006
Posts: 6,979
Likes: 31
From: Wichita KS
Check to see if any/all of these codes are disabled (set to not report, and no MIL)
P0101
P0102
P0103
If they are, car is almost certainly in SD mode. Most tuners put the car in SD mode by purposely causing the MAF to fail, such as changing the high frequency error value to 1hz. What this means is anytime the MAF reports 1hz or more, P0103 is immediately set, and car is then in SD mode. And this is why that code would be turned off.
If you still had the early MAF, you could also check by simply unplugging it. But if you used the integrated IAT on your late model MAF, and no longer have the separate IAT sensor, this won't work.
P0101
P0102
P0103
If they are, car is almost certainly in SD mode. Most tuners put the car in SD mode by purposely causing the MAF to fail, such as changing the high frequency error value to 1hz. What this means is anytime the MAF reports 1hz or more, P0103 is immediately set, and car is then in SD mode. And this is why that code would be turned off.
If you still had the early MAF, you could also check by simply unplugging it. But if you used the integrated IAT on your late model MAF, and no longer have the separate IAT sensor, this won't work.
Thanks I will check that later. I sent a pm to my tuner also.
I do know my maf fail is at 12000 or something else maf related is at 12000 right now.
Race Director
Joined: Oct 2002
Posts: 16,477
Likes: 26
From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
I don't have HPT, so can't tell you exactly what else to look at. If you have a copy of your stock tune, you could compare them, and note any and all MAF setting differences.
Thread Starter
Le Mans Master
Joined: Jun 2006
Posts: 6,979
Likes: 31
From: Wichita KS
There's other ways of doing it, but no matter how it's done, the net result is one of those three codes must be disabled to run SD w/o seeing the CE light. If you find all 3 codes are active and functional, I don't see any way possible you're running SD.
I don't have HPT, so can't tell you exactly what else to look at. If you have a copy of your stock tune, you could compare them, and note any and all MAF setting differences.
I don't have HPT, so can't tell you exactly what else to look at. If you have a copy of your stock tune, you could compare them, and note any and all MAF setting differences.
Thread Starter
Le Mans Master
Joined: Jun 2006
Posts: 6,979
Likes: 31
From: Wichita KS
Check to see if any/all of these codes are disabled (set to not report, and no MIL)
P0101
P0102
P0103
If they are, car is almost certainly in SD mode. Most tuners put the car in SD mode by purposely causing the MAF to fail, such as changing the high frequency error value to 1hz. What this means is anytime the MAF reports 1hz or more, P0103 is immediately set, and car is then in SD mode. And this is why that code would be turned off.
If you still had the early MAF, you could also check by simply unplugging it. But if you used the integrated IAT on your late model MAF, and no longer have the separate IAT sensor, this won't work.
P0101
P0102
P0103
If they are, car is almost certainly in SD mode. Most tuners put the car in SD mode by purposely causing the MAF to fail, such as changing the high frequency error value to 1hz. What this means is anytime the MAF reports 1hz or more, P0103 is immediately set, and car is then in SD mode. And this is why that code would be turned off.
If you still had the early MAF, you could also check by simply unplugging it. But if you used the integrated IAT on your late model MAF, and no longer have the separate IAT sensor, this won't work.
Also when I look at my HP tuners operating system on my laptop it says "1 bar map - Speed Density Enhanced". I do know that after I got it back fromt eh tuner again it wanted me to use ANOTHER 2 credits to get my hp tuners to tweak my car (4 total).
Last edited by Corvette Don; Nov 17, 2008 at 08:19 AM.
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Melting Slicks
Joined: Jul 2006
Posts: 3,356
Likes: 1
From: Chesapeake Va
Well I just checked and all 3 of those codes have a check mark in the box and the maf fail is set to 12500 so does that mean I am not sd tuned?
Also when I look at my HP tuners operating system on my laptop it says "1 bar map - Speed Density Enhanced". I do know that after I got it back fromt eh tuner again it wanted me to use ANOTHER 2 credits to get my hp tuners to tweak my car (4 total).
Also when I look at my HP tuners operating system on my laptop it says "1 bar map - Speed Density Enhanced". I do know that after I got it back fromt eh tuner again it wanted me to use ANOTHER 2 credits to get my hp tuners to tweak my car (4 total).
In SD the fail should be set to 0 or 10, and the codes should be set to no MIL, not no error reported.
I also zero the MAF table.
Melting Slicks
Joined: Jul 2006
Posts: 3,356
Likes: 1
From: Chesapeake Va
Thread Starter
Le Mans Master
Joined: Jun 2006
Posts: 6,979
Likes: 31
From: Wichita KS
Ok then thanks for the help. I wonder why it wanted me to use my last 2 credits after it got back from the tuner? Also one last thing, my stock maf was a 78mm and I now have a 85 BUT when I check I still have the 78mm maf tables loaded??
Tech Contributor
Joined: Apr 2007
Posts: 10,924
Likes: 77
From: Forney Texas
If you do find that you're SD tuned, he may have left the MAF on there for IAT's. I believe all 85mm MAFs are 5 wire units which pull the Intake Air Temps off the embedded sensor. I relocated mine to the intake manifold when I switched over to a 2-bar tune.
Race Director
Joined: Oct 2002
Posts: 16,477
Likes: 26
From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
