i just got done hooking up my ngk afx to my s300 unit. I wired the yellow analog wire to the D10 pin(ELD) and the brown wire to the body for a ground as per ngk's directions. Here is the problem: When datalogging the afr is about .30-.40 less than the ngk display. did i do something wrong? or is this just normal?

 

What voltage table do you have set in the S300.

 

if its .30 or .40 off then in the table take that much off so if the afr is 20 and the voltage is 5 and its off but 5 subtract or add

mine is 0 volts =9.8
5 volts= 19.8

mine was reading higher so i took way. .2 to even it out

if it was off lower i would have added .2

 

i belive 0v is 9.0 and 5v is 16.0

 

but why does it read differently? and which one is truely accurate?

 

ok so if its reading lower add .4 fo it would be 9.4 and 16.4 if is reading higher then you are going to minus so it would be 8.4 nd 15.4

I would believe the wideband. the differences from what i under stand is the 9.0v to 16. is the range it works and sometimes it does not trully sweep tht rang you just have to comp in the software to math them up cuse th output voltage may not be what the input voltage is .sounds confusing.