how to service vehicle OBD2 codes...?

Question

i got an actron and found out some codes causing my check engine light. my question is how do i find out what to do about them? any suggestion? for example, one of them is "MAF/VAF CIRCUIT LOW INPUT." do i just replace the MAF sensor? another is "MAP/BARO CIRCUIT HIGH INPUT." just replace that sensor also? i'm not expecting the mechanical answers, just asking does anyone know a place to find out what to do about codes when you identify them. thanks in advance.

1996 CHEV S10 BLAZER 4.3L V6

Answer 1

MAF is mass air flow, MAP is manifold absolute pressure. The low input would mean not enough air is comimg in the intake. Possibly a dirty maf sensor. The high input would indicate too much vacuum in intake manifold probably caused by the lack of air in the intake. A sensor is never bad unless it is tested and proven bad. The check engine lite takes messages from the sensors to tell you there is a problem. NEVER replace any part till you know the problem. The maf sensor is quite expensive and is very delicate. Be careful not to damage when cleaning.

Answer 2

The MAF sensor Low input could possibly be a dirty MAF screen. But then again if you switched out the sensors it'd be a sure way to fix it. High input for the MAP could possibly mean that there's a high reference voltage going back to the computer. I'm not sure what could cause it at the moment though. And you either have a MAP sensor or a MAF sensor. I don't believe you can have both.

Answer 3

if the reader shows a bad sensor, go ahead and replace them. those 2 sensors are not that expensive. if that doesn't fix the problem, then it's time to do a lot of research and see what else could be wrong. also, check all wiring to those sensors to make sure they are connected good.

Answer 4

year? make? model?