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On a CSP5 tune, does the Air Density Select Value automatically default to 5?
I'm trying to diagnose a loss in fuel mileage and one thing that I noticed is the Air Density Select Value is at 5 which translates to ~27000 ft but I'm at sea level. I replace the Barometric Pressure Sensor and the value is still at 5.
No it doesn't, Number 5 is protection mode, eg the ECM has sensed a problem and defaults to 5 for all running conditions (see parameter E2593).
Check for DTC's, there might be a valid reason it is doing that.
That's what I thought but I wasn't sure. I know that 5 is the default and I've checked for any set DTCs but there are none set. Now I'm looking at sensors that may not be reading properly but are not completely bad.