MTU 12 V 4000 Lx4 Operating Instructions Manual page 130

520 – SD P-Intake Air after Filter A
Yellow alarm.
Associated parameter 1.0186.900
Cause
Intake air pressure sensor after
filter on A side defective, short
circuit or wire break.
522 – SD P-Intake Air after Filter B
Yellow alarm.
Associated parameter 1.0187.900
Cause
Intake air pressure sensor after
filter on B side defective, short
circuit or wire break.
536 – AL Wiring PWM_CM1
Red alarm.
Associated parameter 1.1041.921
Cause
Cable break or short circuit on
channel PWM_CM1.
552 – AL GasControlCheck Fault
Red alarm.
Associated parameter 2.1090.118
Cause
Gas train test was not
successful. Alarm is activated if
the gas train does not report OK
within a specified time-out
period. Either the gas train leak
test was not successful, the
time-out period is set too short,
or communication is faulty.
130 | Troubleshooting | MS15027/00E 2013-10
Corrective action
u Check sensor and cabling (B81.1), replace if necessary. Fault is
rectified following engine restart.
Corrective action
u Check sensor and cabling (B81.2), replace if necessary. Fault is
rectified following engine restart.
Corrective action
u Check cabling to ignition.
Corrective action
1. Check gas train.
2. Check cabling.