Navistar MaxxForce DT Diagnostic Manual page 144

DIAGNOSTIC MANUAL
1. Aftertreatment Fuel Shutoff Valve
(AFTFSV)
2. Aftertreatment Fuel Inlet Sensor
(AFTFIS)
Downstream Injection (DSI) Unit
The DSI unit is connected to the clean side of the low pressure fuel system, and will provide a metered amount
of fuel to the AFI. The DSI unit provides pressurized fuel injection pulses to the AFI. The AFI is a mechanical
poppet type injector, and will only inject fuel when fuel line pressure is increased above a specific pressure.
140
Figure 37 DSI Unit (MaxxForce® 11 and 13 Engines)
https://www.truck-manuals.net/
3. Aftertreatment Fuel Doser
(AFTFD)
4. Aftertreatment Fuel Pressure 2
(AFTFP2) sensor