MAP Calibration

[yzriders182]

I went with a 2 bar map on a COS tune and I am having problems calibrating the map.

Since its a 2 bar map C6301 Map Sensor Scaler should be set to 190 right?

Then C6302 Map Sensor Offset should be set to a number that makes it read proper barometric pressure whit the key on engine off?

I set C6301 to 190 then played with the scaler to make it read proper barometric pressure for where I am. I then hooked up a vacuum pump and gauge to the MAP and pulled vacuum in steps to make sure the MAP would read right through its range and its way off...

Any suggestions?

[joecar]

Can you post a set of your vacuum gauge readings and corresponding MAP pid values (i.e. in tabular form).

Which 2-bar MAP sensor do you have (are you sure it's not the 2.5-bar MAP sensor)...?

[yzriders182]

I got the MAP for a 06 saturn redline...

After what you just said I did some digging and it seems I need the Baro sensor?

[joecar]

PCM uses MAP at KOEO (key-on-engine-off) as BARO...

and during engine run it updates BARO if MAP ever exceeds it.

[yzriders182]

So the saturn redline map sensor should work ok?

[joecar]

Yes, I believe so.