ATS Warning Lamps and Messages
There are three warning lamps that alert the driver of high exhaust temperature, the need to perform a parked regen or service the DPF, or of an engine fault that affects emissions. A decal attached to the driver's sun visor explains the ATS warning lamps.
Malfunction Indicator Lamp (MIL)
A steadily illuminated yellow malfunction indicator lamp (MIL) indicates an engine fault that affects emissions. See Fig..
DPF Status Lamp and Messages
When soot accumulates in the DPF, the driver display screen presents a DPF status bar. As the soot level in the DPF reaches 60 percent, 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 percent, a parked regen is necessary.
For an explanation of DPF zones, message screens, warning lamps, and available regen modes, see Table.. (Detroit engines) or See Table.. (Cummins engines).
If the DPF status lamp blinks and the driver display screen shows a red status bar (90 percent full), initiate a parked regen immediately in order to prevent an engine derate.
If the DPF status lamp blinks, and the driver display screen shows a DPF status bar that is fully red (100 percent 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 |
 Fig. 1,0–10% Green |
— |
• passive |
|
1 |
 Fig. 2,10–60% Green |
— |
• over-the-road |
|
2 |
 Fig. 3,60–70% Yellow |
 Fig. 4,DPF solid yellow  Fig. 5,HEST solid yellow* |
• over-the-road • parked |
|
3 |
 Fig. 6,70–80% Yellow |
Fig. 7,DPF flashing yellow Fig. 8,HEST solid yellow* |
• over-the-road • parked |
|
4 |
 Fig. 9,80–90% Red |
Fig. 10,DPF flashing yellow Fig. 11,HEST solid yellow* |
• parked |
|
5 |
 Fig. 12,90–100% Red |
Fig. 13,DPF flashing yellow Fig. 14,HEST solid yellow* |
• parked |
Table 1, DPF Zones, Detroit Engines
* Illuminates if exhaust temperature is above a preset limit.
Table 2, DPF Zones, Cummins Engines
|
DPF Zones, Cummins Engines |
|||
|
DPF Zone |
DPF Status Bar |
Warning Lamps |
Regen Mode Available |
|
1 |
Fig. 15,0–60% Green |
— |
• over-the-road |
|
3 |
Fig. 16,60–80% Yellow |
Fig. 17,DPF flashing yellow Fig. 18,HEST solid yellow* |
• over-the-road • parked |
|
5 |
Fig. 19,80–100% Red |
Fig. 20,DPF flashing yellow Fig. 21,HEST solid yellow |
• parked |
Table 2, DPF Zones, Cummins Engines
* Illuminates if exhaust temperature is above a preset limit.
Fig. 22, Malfunction Indicator Lamp (MIL)
Fig. 23, DPF Status Lamp
High Exhaust System Temperature (HEST) Lamp
Slow (10-second) flashing of the high exhaust system temperature (HEST) lamp indicates that a parked regen is in progress, and the engine's high idle speed is being controlled by the engine software, not the vehicle driver.
Steady illumination of the HEST lamp alerts the driver of high exhaust temperature during the regen process if the vehicle speed is below 5 mph (8 km/h), or during a parked regen. See Fig..
