MTU 16V4000L32FNER Operating Instructions Manual page 145

556 – AL GasValve Fault
Red alarm.
Associated parameter 2.1090.124
Cause
Gas supply solenoid valve faulty.
Alarm is active if there are
problems with the gas supply
solenoid valves. Either the gas
supply solenoid valves are faulty,
the timeout period is set too
short, or communication is faulty.
557 – AL speed drop fault
Red alarm. Engine shutdown.
Associated parameter 2.1090.126
Cause
Speed drop. Alarm is activated if
engine speed drops during
starting sequence.
558 – AL Wiring PWM_CM2
Red alarm.
Associated parameter 1.1041.922
Cause
Wire break or short circuit on
channel PWM_CM2.
559 – AL mixture restrictor flap A fault
Red alarm. Engine shutdown.
Associated parameter 1.1450.010
Cause
A problem related to mixture
restrictor flap on A side occurred.
Possible causes: Mixture
restrictor flap faulty, no power
supply to restrictor flap, cabling of
feedback and/or position signal
faulty.
Corrective action
1. Check gas train.
2. Check cabling (→ Page 202).
Corrective action
u Check gas train.
Corrective action
u Check setting at engine governor.
Corrective action
u Check mixture restrictor flap on A side and cabling. Replace
mixture restrictor flap on A side as necessary.
MS150121/02E 2017-09 | Troubleshooting | 145