Scania DC09 - SCR System Fault Reaction and Torque Reduction

Starting and driving
OPM 100 en-GB 35
© Scania CV AB 2023, Sweden
Reaction to fault in the SCR system – EU
Stage IIIB/IV/US Tier 4i/Tier 4f
If a new fault occurs within 40 hours of opera-
tion since the first fault, the warning lamp will
come on. After 30 minutes of operation, the
warning lamp will flash rapidly and torque will
be reduced to 0% (low idling) within 30 minutes.
Once the fault has been remedied and the engine
management system has received an indication
that the exhaust gas aftertreatment system is op-
erational, i.e. when the fault code has been ac-
knowledged in SDP3, torque returns to the
normal level.
IMPORTANT!
If the torque has been reduced to 0% (low
idling), the control unit does not detect that the
SCR system is functioning again. A service tech-
nician must then reset the system so that the
torque returns to the normal level.
Note:
The torque reduction only applies to engines cer-
tified according to US Tier 4. Some emergency
vehicles do not have torque reduction.
Time Warning
lamp
Torque reduction
1
1. Only applies to engines certified according to US Tier 4.
Fault detect-
ed
Constant
light
After 30
minutes
Flashing Torque is reduced by
1% per minute to
70 % of the highest
torque.
After 4 hours Flashing rap-
idly
Torque is reduced to
0% (low idling)
within 2-10 minutes.
319 563
Symbol for fault in SCR system.