MTU 12V4000Gx5S Series Operating Instructions Manual page 185

1712 – AL_supply_unit_defect_SU6
Cause
The OBD system of RA dosing
system 6 has signaled one or
more fault states in the supply
unit. The fault may lead to
dosing / circulation cooling
failure.
1713 – AL_hydraulics_fault_SUDU6
Cause
The OBD system of RA dosing
system 6 has signaled one or
more hydraulic fault states. The
fault may lead to dosing /
circulation cooling failure.
1733 – AL_LO1_T_RA_prefeed_module
Cause
The reducing agent temperature
in the pre-feed module, measured
at sensor B103 is below the limit
value. The temperature is too low.
1738 – AL P5 Or P6 Implausible
Cause
The deviation between charge-air
pressure (B10.1 or the mean
value of B10.1 and B10.2) and
exhaust pressure after cylinder
(B98 or the mean value of B98.1
and B98.2) has violated the limit.
The deviation is too great.
1780 – AL_RA_heating_exceeded
Cause
The reducing agent liquefaction
process has taken too long.
Technical unavailability.
1781 – AL_EmissionComplianceFailure
Cause
The alarm is signaled together
with the MIL lamp. SCR system
operation is not emission-
compliant.
Corrective action
u Contact Service.
Corrective action
u Contact Service.
Corrective action
u Check heating system.
Corrective action
u Contact Service.
Corrective action
u Contact Service.
Corrective action
u Contact Service.
MS15065/01E 2019-01 | Troubleshooting | 183