JLG 1850SJ, Service And Maintenance Manual, Page: 154 / 712

SECTION 3 - CHASSIS & TURNTABLE
3-104 3121619
1858 192 524141 7 DEF dosing valve is blocked with crystalized
urea or other deposits. While SCR system is starting up and fter urea
pressure reaches 10000 hPa, the DEF
dosing module is tested. Expectation is that
urea pressure drops below 1500 hPa if
injector works properly. The test is repeated up
to 3 times before an error is set.
SCRSysPresMon_stPresDropDet_mp = 0 while
SCRCo_stStatus_mp = 16.
Suspected component:
wiring harness
DEF dosing valve
The error is stored into the EEPROM of the ECU
and status at ECU shut down is
regained at ignition on. Check electrical connection of urea injector:
- wiring harness
- connector
Conduct SERDIA use-case "injection test". If it is
faulty:
- remove urea injector from exhaust line:
- check for crystallisation direct on injector noz-
zle / plate
- rinse it thoroughly in water
- remount urea injector and conduct SERDIA
use-case "injection test"
If the error is still active, then exchange urea
injector.
1863 995 524177 7 The error shows up, if no proper urea presure
could be build up within the SCR system
state "Fill Lines" => SCRCo_stStatus_mp =
1. This error shows up, if no proper urea presure
could be build up within the SCR system
state "Fill Lines" => SCRCo_stStatus_mp = 1.
3 cases can lead to the error:
Case A: increasing pressure is detected within
15s the check has passed => no error
Case B: The pressure threshold was not reached
within the 60s but case A was not
positiv.
Case C: The minimum pressure of 3000 hPa was
not reached within the 60s. Make sure that DEF lines, pump and tank are not
frozen.
Check for DEF level in the tank.
Check DEF lines:
Are all DEF lines connected?
Is the suction line blocked?
Is ther any leakage? Not only urea to the outside
but also air into the lines, especially in
the suction line!
Perform SERDIA usecase "pressure test":
Does the DEF pump work? => check wiring har-
ness & PWM signal for pump.
Does the urea pressure increase?
All errors are already healed?
If still unsuccessful so far:
Check urea pressure sensor: At ignition on and
SCR system state = 0 ("Init check"),
SCR_pAbsAdapUPmpP shall be identical to
EnvP_p. Fulfilled: Sensor okay!
Check DEF pump filter: Is any dirt inside?
Suspected components:
Suction line
PWM Powerstage has a defect and a default
value which leads not to a rising pressure
DEF pump pressure sensor defect
DEF pump filter contains dirty parts
Table 3-10. Engine Fault Codes
Deutz
Code
Blink
Code
SPN FMI Description Possible Cause Action