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02 06-19

SUBJECT

DATE

Aftertreatment System - Aftertreatment System Overview

February 2019

Additions, Revisions, or Updates
Publication Number / Title

Platform

Section Title

Change

Performing a Parked
Regeneration
DDC-SVC-MAN-0190

GHG17 DD
HD

Aftertreatment DEF
Gauge/Lamps

Updated GHG17 HD procedures.

Instrument Panel Lamps

All information subject to change without notice.

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2 Performing a Parked Regeneration

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Performing a Parked Regeneration

Parked Regeneration for Vehicles without a Physical Switch
Parked regeneration can be initiated by selecting OK when the driver message center displays "Parked Regen Required" or
"Parked Regen Available". A parked regeneration is allowed when the DPF lamp is illuminated.

A parked regeneration can be stopped by selecting OK while the regeneration is in progress. The parked regeneration may
take up to 45 minutes.
Parked Regeneration for Vehicles with a Physical Switch
WARNING: ENGINE EXHAUST
To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area.
Engine exhaust is toxic.

WARNING: HOT EXHAUST
During parked regeneration the exhaust gases will be extremely HOT and could cause a fire if
directed at combustible materials. The vehicle must be parked outside.
NOTE: Under factory default settings, when the Diesel Particulate Filter (DPF) Regeneration Lamp is not
illuminated, the regeneration request switch is disabled.
NOTE: The driver MUST stay with the vehicle throughout the regeneration process.
NOTE: Not all vehicles may be equipped with a Regeneration Request Switch due to application or user
specification.
NOTE: The procedure will take approximately 30 to 45 minutes (depending on engine type and the amount of
soot accumulated in the DPF).
When the parked regeneration request is accepted, the Diesel Particulate Filter (DPF) Regeneration lamp will turn ON one
time for one second and then turn off for the remainder of the parked regeneration. The High Exhaust System Temperature
(HEST) lamp will flash for one second every ten seconds and eventually become solid when the tailpipe temperature is above
525°C (977°F).

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The engine speed may vary during parked regeneration (depending on engine displacement, exhaust temperature and the
amount of soot accumulated in the DPF). The regeneration is complete when the engine returns to low idle and the DPF lamp
remains OFF. The HEST lamp will remain ON, but the vehicle may be driven.
NOTE: A parked regeneration will STOP and the engine will return to low idle if any of the following happens:
• The key is turned to the OFF position
• The vehicle is put into gear
• The clutch is cycled
• The parking brake is released
NOTE: If a parked regeneration is being performed to check NOx conversion, the calculated ambient temperature
in the ACM (AS053) must be above 0°C (32°F) or the test will fail.
NOTE: If the HEST LAMP is FLASHING, regeneration is in process and the system is coming up to temperature.
1. Keep engine at slow idle (cannot be in Fast Idle or PTO Mode). Put transmission in neutral (if equipped with an
automatic transmission, cycle it into gear and then back to neutral).
2. Set park brake (cycle the park brake OFF then ON).
3. Press and release clutch pedal once per ignition cycle (if configured).
4. Hold DPF Switch to the ON position for five seconds and then release (engine speed will increase and DPF lamp will
go out).

All information subject to change without notice.

02 06-19

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3 Aftertreatment Diesel Exhaust Fluid Gauge/Lamps

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Aftertreatment Diesel Exhaust Fluid Gauge/Lamps

ATD DEF Gauge/Lamps for Vehicles with a Video Gauge
Diesel fuel and DEF levels are communicated using a dual-purpose gauge.

1. Fuel Gauge Pointer
2. DEF Gauge Pointer

3. Low Fuel Level Warning Icon
4. Low DEF Level Warning Icon

The low DEF Level warning icon (4) displays amber when the DEF level drops below 1/8 th of tank capacity. Progressive
warning messages will appear on the dash display. In the empty state, the DEF icon flashes, the MIL icon displays, vehicle
speed is limited to 55 mph, and an engine derate is enabled. In the empty and ignored state, the DEF icon flashes, the MIL
icon displays, vehicle speed is limited to 5 mph, and an engine derate is enabled.
ATD DEF Gauge/Lamps for Vehicles with a Physical Gauge
A four light bar segment indicates the Diesel Exhaust Fluid (DEF) level in 25% increments. Low DEF levels will trigger a
decrease in the engine's performance. The use of improper DEF fluid will trigger a decrease in the engine's performance. In
an empty or an ignored state and the diesel fuel tank is filled without filling the DEF tank, the vehicle's speed will be limited
to 5 mph until DEF is detected in the DEF tank.
NOTICE: Tampering with the Aftertreatment System (ATS) system components and/or Diesel Exhaust Fluid
(DEF) quality will result in a progression of lamp warning, engine performance reductions, and eventual 5mph
vehicle speed limiting. 5mph vehicle speed limiting will be applied during non-drive conditions.
The table below shows the various states in which the Aftertreatment Device notifies the driver using the driver indicator
lamps on the instrument panel.

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Figure 2. Driver Card

All information subject to change without notice.

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4 Instrument Panel Lamps

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Instrument Panel Lamps

The instrument panel lamps are explained below:
Amber Warning Lamp
Table 1.
Lamp

Lamp Name
Amber Warning Lamp (AWL)

Description
Indicates a fault with the engine
controls.

Result
Vehicle can be driven to end of shift.
Call for service.

Lamp Solid

Lamp Flashing

• At the start of every ignition cycle (bulb check).

• Flashes last 90 seconds before idle shutdown if programmed for override.

• When an electronic system fault occurs. (Fault should be
diagnosed as soon as possible.)

• Flashes when idle shutdown or the optimized idle shutdown occurs.

Red Stop Lamp
Table 2.
Lamp

Lamp Name
Red Stop Lamp (RSL)

Description

Result

Indicates a major engine fault that
Move the vehicle to the nearest safe
may result in engine damage. Engine location and shut down the engine.
derate and/or shutdown sequence will Call for service.
be initiated.

Lamp Solid

Lamp Flashing

• At the start of every ignition cycle (bulb check).

• Flashes when engine protection shutdown occurs.

• A potential engine damaging fault is detected.

Diesel Particulate Filter Regeneration Lamp

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Table 3.
Lamp

Lamp Name

Description

Result

Diesel Particulate Filter Regeneration
Lamp

Solid yellow indicates a regeneration
is required. Blinking yellow, derate
and/or shutdown are possible as soot
load continues to increase. Lamp will
shut off during parked regeneration.

Lamp Solid - regeneration is required.
Lamp Flashing- regeneration is
required immediately.

Lamp Solid

Lamp Flashing

• At the start of every ignition cycle (bulb check).

• When a regeneration is required immediately (if the lamp flashing is
ignored), a derate and/or shutdown could occur.

• Regeneration is required.

High Exhaust System Temperature Lamp
Table 4.
Lamp

Lamp Name
High Exhaust System Temperature
(HEST) Lamp

Description
Lamp is yellow. Indicates exhaust
temperature is above a preset limit
and unit is operating at low vehicle
speed (below 5 mph [8 kph]). When
the engine speed is elevated for a
parked regeneration, lamp will flash
once every 10 seconds.

Result
Vehicle can be driven. Lamp solid for
an extended period (Longer than 40
Minutes) - call for service.

Lamp Solid

Lamp Flashing

• At the start of every ignition cycle (bulb check).

• Flashes every 10 seconds when the Selective Catalytic Reduction ( SCR
Catalyst) is not up to temperature.

• Vehicle speed is less than 5 mph and the Diesel
Particulate Filter (DPF) outlet temperature is greater than
525° C (977° F).

Malfunction Indicator Lamp
Table 5.
Lamp

Lamp Name
Malfunction Indicator Lamp (MIL)

Description
Yellow lamp Indicates a failure of an
Emission Control device. May
illuminate at the same time as the
Amber Warning Lamp.

Lamp Solid

Lamp Flashing

• At the start of every ignition cycle (a bulb check).

• Never flashes.

Result
Vehicle can be driven to end of the
shift. Call for service.

• For any emission related fault (light out when the fault is
inactive).

Fuel Filter Restriction Sensor Lamp: Fuel Filter Failed
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4 Instrument Panel Lamps

Table 6.
Lamp

Lamp Name
Fuel Filter Restriction Sensor (FFRS)
Lamp

Description
Yellow lamp Indicates that the fuel
filter is restricted and needs to be
serviced. May illuminate at the same
time as the Malfunction Indicator
Lamp (MIL) and Amber Warning
Lamp (AWL).

Lamp Solid

Lamp Flashing

• At the start of every ignition cycle (a bulb check).

• Never.

Result
Service soon.

• Fuel filter needs service.

Water-In-Fuel Lamp (WIF)
Table 7.
Lamp

Lamp Name
Water-In-Fuel (WIF) Lamp

Lamp Solid

Description
Yellow lamp indicates that the fuel
water separator has reached its
capacity and needs to be drained.

Result
Engine water separator must be
drained or an engine derate will
occur.

Lamp Flashing

• At the start of every ignition cycle (a bulb check).
• Water separator has reached it maximum capacity.

Instrument Panel for Vehicles with Video Instrument Cluster (ICUC)
Once the DPF status bar has reached 60 to 80% (yellow), an active or passive regeneration is allowed. A notice message is
displayed indicating "Diesel Particulate Filter Approaching Full." Passive regenerations can occur during extended periods of
time at highway speeds once the predetermined conditions are met.

Once the DPF status bar has reached 80 to 90% (red), a parked regeneration must be performed. A caution message is
displayed indicating "Diesel Particulate Filter Parked Regeneration Required".

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Once the DPF status bar has reached 80 -90% (red) a parked regeneration must be performed. If a regeneration is not initiated
within 30 seconds of the engine starting, the engine will shut down. A warning message is displayed indicating "Diesel
Particulate Filter Parked Regeneration Required."

All information subject to change without notice.

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