JLG 400S Service And Maintenance Manual page 263

Deutz Blink
SPN FMI
Code Code
524078 9 1537 255
524079 9 1538 256
3121671
Table 3-16. Deutz Engine Fault Codes
Description
Lambda value of NOx-Sensor downstream
SCR is out of range.
When the filtered Lambda concentration
value at the sensor
(ComRxSCR_rFltLamDs_mp) is greater
than the physical range check max. lambda
threshold
sensed lambda value of NOx-sensor down-
stream SCR catalyst is < physical low limit
ComRxSCR_rCanLamDs_mp < threshold
SECTION 3 - CHASSIS & TURNTABLE
Possible Cause
sensed lambda value of Nox-sensor down-
stream SCR catalyst is > physical high limit
ComRxSCR_rCanLamDs_mp > threshold
sensed lambda value of NOx-sensor down-
stream SCR catalyst is < physical low limit
ComRxSCR_rCanLamDs_mp < threshold
Action
Check whether NOx-sensor downstream SCR
catalyst is physically mounted within the
exhaust line
Check Lambda values of NOx-sensor down-
stream SCR catalystat at idle conditions,
ComRxSCR_rCanLamDs_mp > threshold?
Compare to ComRxSCR_rCanLamUs_mp. Val-
ues must be almost identical
Check CANBus of NOx-sensor downstream SCR
catalyst
Check NOx-sensor downstream SCR catalyst
wiring
Check NOx-sensor downstream SCR catalyst
itself
Replace NOx-sensor downstream SCR catalyst
Compare to ComRxSCR_rCanLamUs_mp.
ComRxSCR_rCanLamDs_mp must be almost
identical!
If almost identical,
Check air path of engine: EGR-Valve, Intake-
Throttle, Turbocharger and Piping each
for leakage and correct function
Check injection system of engine. Injector
stuck?
if sensed lambda upstream SCR higher
(ComRxSCR_rCanLamUs_mp) : Diesel in
Urea-tank?
Check CANBus of NOx-sensor downstream SCR
catalyst
Check NOx-sensor downstream SCR catalyst
wiring
Check NOx-sensor downstream SCR catalyst
itself
Replace NOx-sensor downstream SCR catalyst
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