EMISSION SOLUTION AND CONTROL
AFTERTREATMENT, MACK
Aftertreatment Tampering
When the SCR tampering fault is active for one or more hours, a new Driver Information Display (DID) screen appears. The text
changes for the Driver Information Display (DID) screen associated with this fault are listed in the following table.
Triggers
Aftertreatment
Tampering Indicator
Driver Information
Display Screen
No Fault
None None
Tampering Fault Detected
Note: For examples of
the various SCR sensor
tampering types refer to the
“SCR Sensor Disconnected
Tampering Type” table
below.
SCR System Fault
Engine will Derate in approx.___ mins
Driving with Active Fault for
+ 1 hrs
SCR system fault.
Engine in derate
5 MPH limit in approx. <___mins
Note: Once this SCR
tampering 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.
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