thnx, I'll check
I believe it is mode 1 msg 0 byte 55 ALDL message
and it is not used in description
thnx, I'll check
I believe it is mode 1 msg 0 byte 55 ALDL message
and it is not used in description
I get ~128 values at idle. Very similar to blm.
Is it correct? How to convert it to AFR if yes?
10-20 afr wideband
Also I have an issue with MAF
It is mode1 msg0 word47
GM/SEC = 512N/65536
If i use this formula I get 0 value
Datastream value is 200ish
Last edited by yoheer; 09-27-2023 at 09:11 PM.
According to the EE definition file for EEHack, MAF gm/s is a Word (16 bits) at Offset 45 in Mode 00 (F4 00). The calculation you posted is correct. If your datastream value was 200, then the result should be 1.5625 g/s according to that equation. Perhaps you implemented your math function incorrectly?
Converting wideband voltage to AFR depends on your wideband O2 controller. Normally the instruction manual will give you the equation required to convert its voltage into AFR. You only have Byte resolution here since it's an 8-bit ADC, so 0V~5V is 0~255. How to convert 0~255 to X:1 AFR will depend on your Wideband controller. Check your controller's documentation.
1990 Corvette (Manual)
1994 Corvette (Automatic)
1995 Corvette (Manual)
I'll check math function.
It is SLC2 Free by 14point7
This is what i found
0[v]@0.68[Lambda] linear to 5[v]@1.36[Lambda], 10[AFR] linear to 20[AFR] equivalent for gasoline
Okay, then that sucker is incredibly simple. It's a linear equation.
If you want to display as AFR (Gasoline) instead of Lambda (any fuel), then:
AFR:1 = N*(10 / 256) + 10
For example, if N is 128 (~2.5V), then:
AFR:1 = 128*(10/256) + 10
AFR:1 = 128*(0.0390625) + 10
AFR:1 = 5 + 10
AFR:1 = 15
15:1 AFR
1990 Corvette (Manual)
1994 Corvette (Automatic)
1995 Corvette (Manual)
I appreciate your help
Can't make MAF work
A274 GM datastream description
ALDL MODE 1 MESSAGE 0 DATA LIST
Word #46
GP6EAFND GMP6-E NON-DEFAULTED AIRFLOW (MSB)
I get value 2 at idle
If I use math function GM/SEC = 512N/65536 then I get 0
I tried word#47 GP6EAFND+1 GMP6-E NON-DEFAULTED AIRFLOW (LSB)
~200 at idle and it decreases when pushing the pedal.
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