Download 4 - Freightliner Trucks

49
Exhaust
NOTE: Diesel exhaust fluid creeps, causing
white crystals to form around the line fittings.
The presence of crystals does not mean the
system has a leak. Replacing fittings or troubleshooting components is not necessary unless
there is a system failure or a fault code.
Fig. 1, Fig. 2, or Fig. 3 for Detroit Diesel ATS
sensor locations.
7. Check the DPF exterior surface for dents or
other damage. A dent over 3 inches (76 mm) in
diameter and 1/4-inch (6-mm) deep could cause
internal damage to the DPF, causing it to malfunction.
8. Check the SCR catalyst for dents and other
damage.
10. Check the DEF tank, pump, metering unit, and
lines for leaks. See Section 49.01 of the Coronado® Workshop Manual for repair procedures.
9. Check for heat discoloration on the surface of
the ATD. Heat discoloration may indicate internal
damage; especially around the DPF.
11. Check any wires, lines, or hoses within 4 inches
(10 cm) of the exhaust system for heat damage.
Repair or reroute as needed.
13
14
12
9
9
1
2
8
3
7
11
10
6
4
15
5
08/20/2009
f490355
NOTE: The sensor box (item 8) contains the SCR inlet and outlet NOx sensors, DPF outlet pressure sensor, and the
DOC inlet pressure sensor.
1. DOC Outlet Temperature
Sensor
2. DOC Inlet Pressure Sensor
Port
3. DOC Inlet Temperature Sensor
4. Front Heat Shield
5. DEF Nozzle
6.
7.
8.
9.
10.
Exhaust Outlet
DEF Metering Unit
Sensor Box (see note above)
Exhaust Inlet
SCR Outlet Temperature
Sensor
11.
12.
13.
14.
SCR Outlet NOx Sensor Port
SCR Inlet NOx Sensor Port
14-Pin Connectors
DPF Outlet Pressure Sensor
Port
15. SCR Inlet Temperature Sensor
Fig. 1, One-Box ATS Sensor Locations
49/2
Coronado Maintenance Manual, January 2010