EMISSION SOLUTION AND CONTROL
AFTERTREATMENT, MACK
DEF Quality
The vehicle instrument cluster has an aftertreatment DEF quality indicator.
Triggers Aftertreatment DEF
Quality Indicator
Driver Information
Display Screen
Good DEF Quality
None None
Poor DEF Quality DTC
Initial Detected
POOR DEF QUALITY
Engine will derate in approx. ___ mins
Poor DEF Quality DTC
Initial Detected + 1 hours
ENGINE IN DERATE
Poor DEF quality.
5 MPH in approx. ___ mins
Note: : Once this DEF
Quality fault occurs
the DID timer displays.
The timer displays the
minutes available before
the 5 mph derate occurs.
The timer can be cleared
using the Escape (ESC)
button on the stalk
switch control lever.
When the vehicle is
restarted after shutdown
the remaining minutes
before derate occurs will
reappear.
Poor DEF Quality DTC
Initial Detected + 4 hours
Service DEF
5 MPH limit
next veh stop.
Refueling Event with Parking
Brake ON
POOR DEF QUALITY
Service DEF
Vehicle speed limited to 5 MPH.
204
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