68 GC250 Technical Manual
EAAM057608EN
o
SCR:
▪
spn 4331: “SCR Actual Dosing Reagent Quantity (instantaneous)”.
▪
spn 4334: “SCR Dosing Reagent Absolute Pressure”.
▪
spn 4360: “SCR Intake Gas Temperature”.
▪
spn 4363: “SCR Outlet Gas Temperature”.
o
DEF:
▪
spn 1761:
“DEF Tank Level”.
▪
spn 3031:
“DEF Tank Temperature”.
▪
spn 3515:
“DEF Temperature 2”.
▪
spn 3516:
“DEF Concentration”.
▪
spn 5963:
“Total DEF Used”.
o
EST:
▪
spn 3241: “Aftertreatment 1 Exhaust Gas Temperature 1”.
The same measurements are available as internal measurements AM_153, AM_154,
AM_155, AM_156, AM_157, AM_158, AM_159 e AM_180.
Furthermore, the specification requires the display of some icons. The controller
supports them:
o
Indicates that the regeneration of the DPF is inhibited following
explicit command. It is usually displayed in solid (it is a state, not an anomaly).
If, however the condition remains for a long time and the soot level in the filter
becomes extremely high, the ECU activates a diagnostic code with red lamp
(icon with a STOP sign shape) and stops the engine: in this case the icon
becomes fixed or flashing, like red lamp.
o
Indicates that regeneration of the DPF is required. It is fixed (not
blinking) if the quantity of particulate in the filter is above the "regeneration
request" threshold but below the warning threshold. It becomes flashing if it is
above the warning threshold.
o
It signals a high temperature (real or possible) in the emissions
management system (HEST
– High Emission System Temperature), probably
because regeneration is in progress or about to start: the ECU could apply a
reduction in engine performance (derating). It is not flashing.
o
Indicates a low level of the Diesel Exhaust Fluid (DEF) tank. It could
be:
▪
Fixed: level below normal.
▪
Flashing: level below normal, derating in progress.
