Symbol 2844A from ISO 7000 - Title/Meaning: Engine emission system temperature; diesel particulate filter, regeneration underway Function/description: To indicate that the engine emissions system temperature is outside of normal operating parameters. To indicate the engine emissions system temperature. To indicate that active regeneration of the diesel particulate filter is underway and elevated emission system temperatures are possible; engine operation can be affected.
pay attention to orientation of symbolApplication referenced in: ISO 2575
Additional information: 
As part of the implementation for 2007 emissions compliance, medium duty and heavy trucks will now have diesel particulate filters that need to undergo a regeneration process to clean out soot and particulate matter. While usually this will be done while driving, there may be a need for some trucks to ""regenerate"" whild idling. Exhaust temperatures in these situations may be quite high, which means there is a need for a warning light.
Own work using: iso.org/obp/graphics/grs/4ccf7d57-c1af-4827-ae60-224b73c7dbf8 200.png
Vectorization:  Mrmw