Aftertreatment Systems

Detroit™ Gen 5 Heavy Duty engines are equipped with the second generation of the Global Aftertreatment System (GATS 2.0). The function of the Aftertreatment System (ATS) is to reduce emisson levels in the engine exhaust. Mounted onto the ATS are eight sensors, a Diesel Exhaust Fluid (DEF) doser, and an Aftertreatment Control Module (ACM). The sensors monitor various temperatures, pressures and levels within the ATS. The DEF doser measures DEF pressure and injects DEF into the ATS when needed. The ACM controls the functions and analyzes the data of the ATS electronic components by means of the ATS wiring harness. For information on performing a parked DPF regeneration, see How to Perform a Parked Regeneration.

Proper maintenance of the ATS is essential to ensure the engine continues to comply with applicable emissions standards. For a listing of required service intervals, see Preventive Maintenance Tables.

Service Cover
ATS Wiring Harness
ATS Delta Pressure Sensor
Inlet NOx Sensor
ATS Delta Pressure Tube

Fig. 1, ATS Top View

DPF Outboard Clamp
DOC Inlet Temperature Sensor
DOC Outlet Temperature Sensor
DPF Inboard Clamp
DPF

Fig. 2, ATS Side View

1. SCR Outlet Temperature Sensor
2. Outlet NOx Sensor
3. ACM
4. DEF Dosing Unit
5. DPF Outlet Temperature Sensor
6. Soot Sensor ECU

Fig. 3, ATS Rear View