ATS Warning Lamps
There are three warning lamps that alert the driver of the need to perform a regen, of high exhaust temperature, and of a need to refill the diesel exhaust (DEF) fluid tank. A decal attached to the driver's sun visor explains these ATS warning lamps. See Fig..
Fig. 1, Warning Lamp Decal, Sun Visor
See Fig. for an explanation of the ATS warnings, and actions required to avoid engine protection sequences.
Fig. 2, ATS Warning Lamps
Malfunction Indicator Lamp (MIL)
A steadily illuminated yellow malfunction indicator lamp (MIL) indicates an engine fault that affects the emissions. See Fig..
Fig. 3, Malfunction Indicator Lamp (MIL)
DPF Lamp
When soot accumulates in the DPF and 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).
Fig. 4, Diesel Particulate Filter (DPF) Status Lamp
If the DPF status lamp blinks while the CHECK engine lamp is illuminated, initiate a parked regen immediately in order to prevent an engine derate.
If the red STOP engine lamp illuminates with the blinking DPF lamp and the CHECK engine lamp, begin a parked regen in order to prevent an engine shutdown. Park the vehicle and perform a parked regen.
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..
