ATS Warning Lamps and Messages
There are three warning lamps that alert the driver of the need to perform a regen, high exhaust temperature, or a need to refill the diesel exhaust (DEF) fluid tank. A label attached to the driver’s sun visor explains these warning lamps.
Malfunction Indicator Lamp (MIL)
A steadily illuminated yellow engine malfunction indicator lamp (MIL) indicates an engine fault that affects emissions. See Fig..
DPF Status Lamp and Messages
When soot accumulates in the diesel particulate filter (DPF), the driver display screen presents a DPF status bar. As the soot level in the DPF reaches 60%, the DPF status lamp illuminates. See Fig.. Perform a parked regen or bring the vehicle up to highway speed to increase the load (thus starting an active regen). After the soot level in the DPF reaches 80%, a parked regen is necessary.
For an explanation of DPF zones, message screens, warning lamps, and available regen modes, see Table. (Detroit engines) or Table. (Cummins engines).
If the diesel particulate filter (DPF) status lamp blinks and the driver display screen shows a red status bar (90% full), initiate a parked regen immediately in order to prevent an engine derate.
If the diesel particulate filter (DPF) status lamp blinks, and the driver display screen shows a DPF status bar that is fully red (100% full), begin a parked regen in order to prevent an engine shutdown. Park the vehicle and perform a parked regen.
Table 1, DPF Zones, Detroit Engines
|
DPF Zones, Detroit Engines |
|||
|
DPF Zone |
DPF Status Bar |
Warning Lamps |
Regen Mode Available |
|
0 |
 0–10% Green |
— |
• passive |
|
1 |
 10–60% Green |
— |
• over-the-road |
|
2 |
 60–70% Yellow |
 DPF solid yellow  HEST solid yellow* |
• over-the-road • parked |
|
3 |
 Fig. 1,70–80% Yellow |
DPF flashing yellow HEST solid yellow* |
• over-the-road • parked |
|
4 |
 80–90% Red |
DPF flashing yellow HEST solid yellow* |
• parked |
|
5 |
 90–100% Red |
DPF flashing yellow HEST solid yellow* 1 |
• parked |
-
* Illuminates if exhaust temperature is above a preset limit.
Table 1, DPF Zones, Detroit Engines
Table 2, DPF Zones, Cummins Engines
|
DPF Zones, Cummins Engines |
|||
|
DPF Zone |
DPF Status Bar |
Warning Lamps |
Regen Mode Available |
|
1 |
0–60% Green |
— |
• over-the-road |
|
3 |
60–80% Yellow |
DPF flashing yellow HEST solid yellow* 1 |
• over-the-road • parked |
|
5 |
80–100% Red |
DPF flashing yellow HEST solid yellow |
• parked |
-
* Illuminates if exhaust temperature is above a preset limit.
Table 2, DPF Zones, Cummins Engines
Fig. 2, Malfunction Indicator Lamp (MIL)
Fig. 3, DPF Status Lamp
High Exhaust System Temperature (HEST) Lamp
Slow (10-second) flashing of the high exhaust system temperature (HEST) lamp indicates a parked regen is in progress and the engine's high idle speed is being controlled by the engine software.
Steady illumination of the HEST lamp during a parked regen or if the vehicle speed is below 5 mph (8 km/h), alerts the driver of high exhaust temperature during the regen process. See Fig..
