MTU 16V4000L32FNER Operating Instructions Manual page 151

622 – LOLO NOx Value
Yellow alarm.
Associated parameter 2.3050.025
Cause
NOx emissions have undershot
the second limit value.
623 – HI NOx Value
Yellow alarm.
Associated parameter 2.3050.026
Cause
NOx emissions have exceeded the
first limit value.
624 – HIHI NOx Value
Yellow alarm.
Associated parameter 2.3050.027
Cause
NOx emissions have exceeded the
second limit value.
626 – AL Wiring PWM_CM8
Red alarm.
Associated parameter 1.1041.928
Cause
Wire break or short circuit on
channel PWM_CM8.
627 – AL Wiring PWM_CM9
Red alarm.
Associated parameter 1.1041.929
Cause
Wire break or short circuit on
channel PWM_CM9.
Corrective action
1. Check gas quality if feasible.
2. Check gas pressure.
3. Check NOx sensor (→ Page 203).
4. Check emissions (→ Page 47).
Corrective action
1. Check gas quality if feasible.
2. Check NOx sensor (→ Page 203).
3. Check emissions (→ Page 47).
Corrective action
1. Check gas quality if feasible.
2. Check NOx sensor (→ Page 203).
3. Check emissions (→ Page 47).
Corrective action
u Check cabling to NOx sensor on B side (→ Page 202).
Corrective action
u Check setting at engine governor.
MS150121/02E 2017-09 | Troubleshooting | 151