Anyone work through rescaling MAF calibration tables to correct a p0101? I installed the Bosch 68mm throttle body and am using the crackle pop tune. Car doesn't seem to really care about the code.
I have reflashed the tune disabling the DTC for this code to collect data and started to attempt a rescale on the MAF sensor calibration tables but can't seem to get it to a point where the code stays off.
P0101 after larger throttle body install
-
CrazyCanadian
- Posts: 47
- Joined: July 4th, 2021, 8:32 pm
Re: P0101 after larger throttle body install
Posting your tune and some logs would be helpful
-
liltoaster91
- Posts: 2
- Joined: May 30th, 2026, 1:29 pm
Re: P0101 after larger throttle body install
Here is a driving log and the tune file that is on the car. Sorry for such a late response and thanks for taking a look.
- Attachments
-
Data log - 2026-05-30 15.44.35_2.csv- (662.26 KiB) Downloaded 5 times
-
- Data log - 2026-05-30 15.44.35_3.csv
- (650.71 KiB) Downloaded 5 times
-
- Data log - 2026-05-30 15.44.35.csv
- (872.19 KiB) Downloaded 5 times
-
- MX-5 NC2 NC3 Stage I for Stock Car 93US 98EU Octane with Aggressive Crackle and Pop v1.07.vtune
- (23.62 KiB) Downloaded 4 times
Re: P0101 after larger throttle body install
The first two logs were damaged in transfer.
The 3rd log only has the long term fuel trims, but we can see that it only goes from 2.3 to 4.7% so the deviation is well within limits.
Changing the throttle body will have no effect on the MAF calibration. Also, P0101 usually pops up when the MAF voltage exceeds the voltage limit, usually 4.92V, which usually means a short in the wiring. So clean the MAF connectors, you should be fine after that.
The 3rd log only has the long term fuel trims, but we can see that it only goes from 2.3 to 4.7% so the deviation is well within limits.
Changing the throttle body will have no effect on the MAF calibration. Also, P0101 usually pops up when the MAF voltage exceeds the voltage limit, usually 4.92V, which usually means a short in the wiring. So clean the MAF connectors, you should be fine after that.
2008 Cosmic Blue Mazda 3MPS
Built engine + WMI + GTX3071 gen2, ~550BHP @35PSI
2008 Icy Blue Mazda CX7
Built engine and stock exhaust (YES!!), JBR3" + GTX2867 gen2 + Autotech HPFP, self-tuned to 360-ish BHP
Built engine + WMI + GTX3071 gen2, ~550BHP @35PSI
2008 Icy Blue Mazda CX7
Built engine and stock exhaust (YES!!), JBR3" + GTX2867 gen2 + Autotech HPFP, self-tuned to 360-ish BHP
-
CrazyCanadian
- Posts: 47
- Joined: July 4th, 2021, 8:32 pm
Re: P0101 after larger throttle body install
Logs 2 and 3 are missing the headers. The first log has short term and long term fuel trims from what I see... You can remove Desired EQ/AFR. The pid doesn't work for some reason. I've run across that on NC's before.liltoaster91 wrote: ↑June 18th, 2026, 7:07 pm Here is a driving log and the tune file that is on the car. Sorry for such a late response and thanks for taking a look.
Your MAF voltage looks with in range. There is MAF flow delta adjustments. I suspect this plays into a minimum expected calculated airflow spec at idle and it'll be based off the throttle body position. I'll need to see the the throttle body position data. If you can also include DTC info so that I can see when the code triggers.
I haven't run across this code much on Mazdas but on other platforms I used to see it quite a bit.
You need to log, RPM, Absolute load, short term and long term fuel trims, AFR (or EQ ratio), Throttle position, APP, MAP, mass airflow, mass air flow voltage and check engine light/DTC indicator if possible.
Drive it just like you did with log one where you record from start to finish with a couple WOT, some idle and varying light/mid throttle driving.