One-Box Ats Sensor Locations - Western Star 4700 Maintenance Manual

Exhaust
08/20/2009
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
No leaks are allowed anywhere in the system. If
any discrepancies are discovered, refer to the
engine manufacturer's service literature for re-
pair instructions.
1. Check for leakage at the clamp that attaches the
exhaust pipe to the turbocharger exhaust outlet.
If leakage exists, tighten the nut on the clamp to
the required torque. If leakage persists, install a
new clamp.
2. Check the exhaust pipe, bellows, and each ex-
haust seal clamp for leakage, wear, cracks, or
damage. Replace damaged components as
needed. If leakage exists at a clamp, tighten the
nuts to the required torque. If leakage persists,
install a new exhaust seal clamp. Do not reuse
seal clamps. Once a seal clamp is loosened or
removed, it must be replaced.
Western Star Maintenance Manual, December 2015
14 13
9
15
6. Exhaust Outlet
7. DEF Metering Unit
8. Sensor Box (see note above)
9. Exhaust Inlet
10. SCR Outlet Temperature
Sensor
Fig. 1, One-Box ATS Sensor Locations
12
8
7
11
10
6
5
A leak in the CGI piping, including the bellows,
will allow unfiltered air and contaminants into the
engine intake, and can cause serious engine dam-
age.
NOTE: Because the CGI bellows is covered
with a metal mesh, it is difficult to see cracks or
damage that may cause a leak.
3. On vehicles with CAT engines, inspect the CGI
bellows and piping for evidence of damage or
leakage. See
or leaking, replace it. See
ment procedure.
4. If present, check the condition of the insulation
material around the exhaust pipe between the
turbocharger and the ATD.
9
1
11. SCR Outlet NOx Sensor Port
12. SCR Inlet NOx Sensor Port
13. 14-Pin Connectors
14. DPF Outlet Pressure Sensor
Port
15. SCR Inlet Temperature Sensor
NOTICE
Fig. 5. If the bellows is damaged
49–02 for the replace-
49
2
3
4
f490355
49/3