If it is in there check also on the drivers side of the engine block. Often , on new models the ECU is mounted behind the fuel filter housing.
Another way to find the ECU is following the wiring that are coming from the fuse box, on one way they go toward the device, on the other they go to the car computer
Here is the ECU:
If you need replacement you can buy here :
Dodge Sprinter Auto Parts & MoreHere you can also buy the Chilton repair manual with illustrations for all car parts and all step-by-step iillustrated procedures, this is a must if you want to DIY your vehicle.
Dodge Sprinter Repair Manual - Partstrain.comHere is a cheaper manual, with immediate download, I do not know if it is good:
MANUAL, SERVICE - DownloadsI see If I can find a precise schematic, or a picture, in case I will post it tomorrow, as now I am going offline.