Aldl LT1 datastream

[NomakeWan]

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

[yoheer]

I appreciate your help

[yoheer]

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.

[steveo]

i dont think you're understanding 8 and 16 bit numbers very well, thats a 16 bit unsigned integer. msb and lsb.

[NomakeWan]

What steveo said. If the MSB of the 16-bit Word is 2 and the LSB of the 16-bit word is 200, then the complete value of the 16-bit word is 712. Plugging 712 into the MAF conversion equation from earlier, it comes out to 5.5625 gm/s at idle. At hot idle my '95 Corvette hovers around 7 gm/s, for comparison.

[yoheer]

Thanx guys, i've already fixed it and it works.I was trying to get data from 1 byte, not 2. Time after time.