C U M M I N S E N G I N E S
4-5
The ATS is comprised of a diesel oxidation catalyst (DOC), and a diesel particulate filter (DPF). The
DPF traps soot particles, and exhaust heat converts the soot to ash in the DPF in a process called
regeneration (re-gen). The harder an engine works, the better it disposes of soot. When the engine is
running under load and re-gen occurs without input, it is called passive re-gen. If the engine isn’t running
hot enough, the electronic controls may initiate an active re-gen, whereby extra fuel is injected into the
exhaust stream before the DPF, to superheat the soot trapped in the filter and burn it to ash. Both types
of re-gen occur without driver input.
Operating at reduced engine load will allow soot to accumulate in the DPF. When this occurs, the DPF
lamp
illuminates, indicating that a re-gen
must
be performed, and the driver
must
bring the vehicle
up to highway speed to increase the load. Driving at highway speeds for 20 minutes should allow for a
re-gen to take place, and turn off the DPF lamp.
After the exhaust stream passes through the DPF, it flows through a second canister housing which is the
SCR device. A controlled quantity of diesel exhaust fluid (DEF) is injected into the exhaust stream where
heat converts it to ammonia (NH
3
) gas. This mixture flows through the SCR device where the ammonia
gas reacts with the NOx in the exhaust to produce harmless nitrogen (N
2
) and water vapor (H
2
O), which
then exits out of the tailpipe.
ATS Warning Lamps
Warning lamps in the driver’s message center alert you of situations with the after-treatment system.
•
An illuminated DPF lamp indicates a re-gen is needed.
Driving at highway speeds for 20
minutes should correct this condition.
o
A blinking DPF lamp indicates the need for a re-gen is more urgent. Again, driving the
vehicle at highway speeds for 20 minutes should correct this condition.
o
A blinking DPF lamp along with a check engine light indicates that the engine is unable to
effectively regenerate, and you should
immediately
seek service at the nearest Cummins
Authorized Dealer.
•
An illuminated High Exhaust Temperature (HEST) lamp alerts the operator of elevated exhaust
temperatures while the engine is performing an active re-gen.
Do not operate, or park the
vehicle near flammable objects while the HEST lamp is illuminated.
•
An illuminated DEF warning lamp indicates that the DEF tank should be refilled at the next
opportunity.
This light will illuminate when the tank level is at approximately 10%.
o
A blinking DEF warning lamp indicates the tank level has dropped to approximately 5%.
o
A blinking DEF lamp along with the check engine lamp indicates the tank level has
dropped to approximately 2.5%. A 25% reduction in engine torque will be applied with
this condition.
Summary of Contents for PowerGlide 2019
Page 6: ...T I R E C A R E 1 1 TIRE CARE Chapter 1 ...
Page 14: ...B R A K E S Y S T E M 3 1 Brake System Chapter 3 ...
Page 17: ...B R A K E S Y S T E M 3 4 Compressed Air System 36 and 40 Bus Non Tag Tank Drains ...
Page 18: ...B R A K E S Y S T E M 3 5 43 Bus Tag Tank Drains ...
Page 21: ...B R A K E S Y S T E M 3 8 ...
Page 37: ...C U M M I N S E N G I N E S 4 17 ...
Page 38: ...S C H E D U L E D M A I N T E N A N C E 5 1 Scheduled Maintenance Chapter 5 ...
Page 45: ...S C H E D U L E D M A I N T E N A N C E 5 8 Lubrication Points ...
Page 46: ...S C H E D U L E D M A I N T E N A N C E 5 9 Lubrication Points ...
Page 47: ...S C H E D U L E D M A I N T E N A N C E 5 10 Lubrication Points ...
Page 48: ...S C H E D U L E D M A I N T E N A N C E 5 11 Lubrication Points ...
Page 53: ...S C H E D U L E D M A I N T E N A N C E 5 16 ...
Page 54: ...P R E T R I P I N S P E C T I O N 6 1 Pre Trip Inspection Chapter 6 ...
Page 57: ...I N S T R U M E N T S C O N T R O L S 7 1 Instruments Controls Chapter 7 ...
Page 84: ...I N S T R U M E N T S C O N T R O L S 7 28 MENU MAP SETTINGS MENUS Settings Menus ...
Page 92: ...I N S T R U M E N T S C O N T R O L S 7 36 ...
Page 93: ...A I R S U P P L Y 8 1 Air Supply Chapter 8 ...
Page 95: ...A I R S U P P L Y 8 3 ...
Page 96: ...T A G A X L E 9 1 Tag Axle Chapter 9 ...
Page 98: ...W A R R A N T Y 10 1 Warranty Chapter 10 ...
Page 100: ...W A R R A N T Y 10 3 ...
