If the DEF tank is not refilled, a 5 mph (8 km/h)
speed limit will be applied after the next engine shut-
down, or while parked and idling.
DEF Quality or SCR Tampering
NOTICE
Once contaminated DEF or tampering has been
detected in the SCR system, the vehicle must be
taken to an authorized service center to check
the SCR system for damage, and to deactivate
the warning lamp and engine limits.
If contaminated DEF or tampering is detected, the
DEF warning lamp flashes, and engine power is lim-
ited with progressively harsher limits applied. If the
fault is not corrected, the STOP engine lamp illumi-
nates and a 5 mph (8 km/h) speed limit is applied
after the next engine shutdown, or while parked and
idling. See
Fig. 9.10.
EPA07 Aftertreatment System
(ATS)
All on-road diesel engines built after December 31,
2006, (EPA07 engines) must meet strict new guide-
lines for reduced exhaust emissions of particulate
matter and nitrogen oxides (NOx). NOx is limited to
just over 1 gram per brake horsepower hour (g/bhp-
hr) and particulate matter cannot exceed 0.01 g/bhp-
hr.
EPA07-compliant engines require ultralow-sulfur die-
sel (ULSD) fuel, and they should never be run on
fuel with sulfur content higher than 15 ppm. In addi-
tion, they require low-ash engine oil. The following
guidelines must be followed or the warranty may be
compromised.
•
Use ultralow-sulfur diesel (ULSD) fuel with 15
ppm sulfur content or less, based on ASTM
D2622 test procedure.
•
Do not use fuel blended with used engine lube
oil or kerosene.
•
Engine lube oil must have a sulfated ash level
less than 1.0 wt %; meeting the API CJ-4 index
specifications.
IMPORTANT: Using non-specification fuels or
oils can lead to shortened Diesel Particulate Fil-
ter (DPF) cleaning or exchange intervals. For
example, using CI-4+ oil with 1.3% sulfated ash
(30% more ash content) may result in the need
for DPF cleaning or exchange 20 to 30% sooner
than would normally be required.
The "exhaust system" in EPA07-compliant vehicles is
called the aftertreatment system (ATS). The ATS var-
ies according to engine manufacturer and vehicle
configuration, but instead of a muffler, an aftertreat-
ment system has a device that outwardly resembles
a muffler, called the aftertreatment device (ATD).
IMPORTANT: See your engine operation manual
for complete details and operation of the after-
treatment system.
Inside the ATD, the exhaust first passes over the die-
sel oxidation catalyst (DOC), then it passes through
A
B
11/08/2010 f470539a
NOTE: Engine power is limited.
A. DEF Warning Lamp (flashing amber)
B. DEF-Level Lightbar (1 bar flashing red)
Fig. 9.9, DEF Empty Warning
A
B
11/18/2010 f470540b
NOTE: The STOP engine, CHECK engine, and DEF
lamps illuminate, engine power is limited, speed limit of
5 mph (8 km/h).
A. DEF Warning Lamp (flashing amber)
B. DEF-Level Lightbar (1 bar flashing red)
Fig. 9.10, DEF Empty and Ignored Warning
Exhaust Aftertreatment Systems
9.7
To Next Page
Loading...
