Aftertreatment Diesel Exhaust Fluid (DEF) Quality - Driver Warning &
Inducement
Triggers
Aftertreatment DEF Tank
Low Level Indicator
Amber Warning Lamp
Inducement
Good DEF Quality
None
None
None
Poor DEF Quality DTC Initial
Detected
None
W303-
1623
None
Poor DEF Quality DTC Initial
De 10 hours
None
W303-
1623
25% torque reduction
Poor DEF Quality DTC Initial
De 20 hours Diesel
Fuel Refueling >15%
None
W303-
1623
8 km/h (5 mph) Road Speed
Limit (RSL)
Temporary Exit from 8 km/h
(5 mph) Inducement
None
W303-
1623
25% torque reduction
Note:
Vehicle has to be stationary before 8 km/h (5 mph) RSL becomes active.
Exit conditions for DEF Quality "5 mph road speed limit (RSL)" Inducement:
First Restart:
Return to 25% torque reduction until proper DEF quality evaluation. If poor DEF quality is detected during the
next monitoring cycle then the 5 mph limit is resumed after vehicle is stationary for 20 minutes. After the second restart a
scan tool is required to exit the 8 km/h (5 mph) RSL.
Mack Body Builder Instructions
CHU, CXU, GU, TD, MRU, LR
USA139046859
Date 5.2017
Body Builder; Engine, MP7, MP8, and MP10
Page 34 (43)
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