JLG 400S Service And Maintenance Manual page 271

Deutz Blink
SPN FMI
Code Code
524195 14 1900 279
3121671
Table 3-16. Deutz Engine Fault Codes
Description
The standstill request of detected
crystallization is ignored for more than
5h(>300min)
This will be activated if there is a standstill
request activated by Crystallization
Monitoring.
SECTION 3 - CHASSIS & TURNTABLE
Possible Cause
Back pressure upstream SCR catalyst has
reached a level which indicates crystallization
inside of exhaust line.
The error detection depends on the sensed
pres-
sure upstream of the SCR catalyst and
the calculated exhaust volume flow through
the mixer pipe.
In case of error is set, but no crystallization can
be found in the mixing pipe, a possible
reason can be the defect sensors:
- exhaust pressure & temperature upstream of
the SCR catalyst,
- the ambient pressure
- the exhaust mass flow => Check air path
sys- tem at the engine.
Action
Dismount urea injector from exhaust line and
inspect visually the injector and the
exhaust line for urea crystallization upstream
of
SCR catalyst:
If crystallization can be clearly seen, then
stand- still must be processed.
Has the engine been operated in low load for
longer time? If yes, then it could be the reason
for crystallization.
Does the NOx-Sensors work properly?
Compare
ComRxSCR_rNOxUs to ComRxSCR_rNOxDs,
when ComRxSCR_stNOxRdyUs = 1 &
ComRxSCR_stNOxRdyDs = 1 (Warm engine
and EAT-system,
SCRT_tCatAvrgExhGs_mp > 250°C,
SCR_stStatus = "Dosing" = 8): sensed NOx
upstream of SCR catalyst must be higher than
downstream of SCR catalyst.
Go to idle and wait until SCR system enters
status "stand-by" (no dosing),
SCRT_tCatAvrgExhGs_mp < 225°C:
ComRxSCR_rNOxUs = ComRxSCR_rNOxDs
Clean urea injector: rinse it thourougly under
water
Check EGR-Path: difference pressure sensor at
venturi tube, EGR cooler, EGR-Valve,
Reed-Valve, Intake throttle regarding function
and leakage. Does the EGR-cooler leak
water in the exhaust? Check air path for
leakage Check turbocharger
No crystallisation can be seen in the mixing
pipe:
Check exhaust pressure sensor upstream of
SCR
catalyst (SCR_pSensUCatUsP):
tube, water in sensor?
Check environmental pressure sensor
(EnvP_p): plausible?
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