MTU 12V4000Gx5S Series Operating Instructions Manual page 154

943 – AL_LO1_NOx_conversion_SCRsys_F2
Cause
The aging compensator for the
NOx setpoint value integrated in
the ECU logic has reached its limit
value. Satisfactory operation of
the B side catalytic converter is
no longer possible.
954 – AL NOx value invalid
Cause
Status information of NOx sensor
(B88); is generated in case of
short-term implausible measured
values or with faulty NOx sensor.
955 – AL Thermal Management active
Cause
Thermal management was
activated as soot loading in the
DPF has reached the limit.
Regeneration has been initiated
automatically.
967 – AL_SU_priming_request_revocation_F1
Cause
The supply unit flow 1 has not
received a command to start the
pump although it has been
activated and the engine is
running. If engine operation is
continued, the components of the
RA dosing system could be
damaged due to overheating.
968 – AL_SU_priming_request_revocation_F2
Cause
The supply unit flow 2 has not
received a command to start the
pump although it has been
activated and the engine is
running. If engine operation is
continued, the components of the
RA dosing system could be
damaged due to overheating.
152 | Troubleshooting | MS15065/01E 2019-01
Corrective action
u Contact Service.
Corrective action
1. Acknowledge alarm.
2. Replace NOx sensor (→ Page 265).
3. Contact Service.
Corrective action
u No action required.
Corrective action
u Contact Service.
Corrective action
u Contact Service.