INSTALLATION
MANUAL
© Scania CV AB 2018, Sweden
Warnings and torque reduction for Stage IIIB/IV/Tier 4i/Tier 4f
01:07 Issue 17 en-GB 55
Warnings and torque reduction for
Stage IIIB/IV/Tier 4i/Tier 4f
The system provides a warning via warning lamps if there are SCR system faults or
if the level of reductant in the reductant tank is too low.
Engines which are certified according to Tier 4 are required by law to have these
warning lamps. They must be installed correctly in the vehicle or machine. The warn-
ing lamps can be ordered via Scania and also accompany the Scania EMS display. If
the installer uses neither Scania warning lamps nor the Scania EMS display, then the
lamps used must have the same functionality and symbols.
More information about connection is available in section DLN8 in 03:05 CAN in-
terface.
Reaction at low reductant level
The engine resumes normal torque after reductant has been topped up so that the lev-
el in the reductant tank is at least 20%.
Reductant level Warning lamp Torque reduction
1
1. Applies only to engines that are certified according to Tier 4.
20% Constant light
10% Flashes slowly (½ Hz) Torque is reduced by 1%
per minute to 70% of the
highest torque
0% Flashes rapidly (2 Hz) Torque is reduced to 0%
(low idling) within 2-10
minutes
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