MTU 16V4000M73 Operating Instructions Manual page 112

444 – SD U-PDU
Cause
Fault in the internal supply voltage
for the injector output stage.
445 – SD P-Ambient Air
Cause
The signal from the ambient
pressure sensor in the ECU is
faulty or missing.
454 – SS Power Reduction Active
Cause
Power reduction is activated. A
main alarm activating power
reduction has been tripped.
470 – SD T-ECU
Cause
The signal from the temperature
sensor in the ECU is faulty or
missing.
472 – AL Stop SD
Cause
This fault is output in case of a
defective sensor which has been
configured to initiate an engine
stop.
474 – AL Wiring FO
Cause
Short circuit or wire break at the
frequency output.
475 – AL CR Trigger Engine Stop
Cause
The Crash Recorder is tripped by
an engine shutdown.
112 | Troubleshooting | MS150123/01E 2017-05
Corrective action
u Contact Service.
Corrective action
u Contact Service.
Corrective action
1. Observe additional messages.
2. Contact Service.
Corrective action
u Contact Service.
Corrective action
u Contact Service.
Corrective action
1. Check engine wiring (→ Page 268).
2. Contact Service.
Corrective action
u Contact Service.