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So when the Alison calls for a defueled shift. what does the ECU do?


I ask this cause on my 1-2 and 2 lock up I see my desired fuel rail pressure and actual fuel rail pressures separate. then come back in other gears.


so then I tried 2 and 3rd and 4th, locked up, and making a pull in each gear, and the Cp3 can keep up with full rpms, and boost and engine load.. so that tells me the fuel delivery is not a problem. but something is telling it to de fuel.


but if in the tune it would be the desired FRP.. so I would see my data logs showing it wanted less and got less.


SO when the TCM calls for less fuel, would it show in the Desired or only actual?
 
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