freightliner BUSINESS CLASS M2 100, Maintenance Manual

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8. Check for heat discoloration on the surface of
the ATD. Heat discoloration may indicate internal
damage; especially around the DPF.
9. Check any wires, lines, or hoses within 4 inches
(10 cm) of the exhaust system for heat damage.
Repair or reroute as needed.
Pre-EPA07 Exhaust System
Inspection
1. Inspect the exhaust manifold at the cylinder head
and at the turbocharger for leaks. See the engine
manufacturer’s service literature for repair proce-
dures.
2. Inspect the muffler body, muffler outlet stack,
muffler shield, and inlet tubes for leakage, dents,
corrosion, or holes in the muffler.
3. Inspect the exhaust pipe and each exhaust seal
clamp for leakage, wear, or damage. Replace the
exhaust pipe if 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 re-
placed.
4. 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
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f490353
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1. DEF Metering Unit
2. DEF Nozzle
3. SCR Outlet Temperature
Sensor
4. SCR Inlet Temperature Sensor
5. DOC Inlet Temperature Sensor
6. DOC Inlet Pressure Sensor
7. DPF Inlet Temperature Sensor
8. DPF Outlet Pressure Sensor
9. DPF Outlet Temperature
Sensor
10. DPF Outlet NOx Sensor
11. SCR Outlet NOx Sensor
Fig. 2, 2V2 Two-Box ATS Sensor Locations
Exhaust
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