Downstream Injection (Dsi) Unit - Navistar MaxxForce DT Diagnostic Manual

DIAGNOSTIC MANUAL

1. Downstream Injection (DSI) unit

Figure 14 DSI Unit (MaxxForce® DT, 9 and 10 Engines)
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 Aftertreatment Fuel Injector (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.
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