MTU 12 V 4000 M33F Operating Instructions Manual page 154

491 – SS ETC4 Overspeed
Speed of the 3rd secondary turbocharger too high (limit value 2)
Red alarm; engine shutdown
Cause
Clogged charge-air circuit or
fault in turbocharger.
492 – AL ETC4 Cutin Failure
Yellow alarm; warning
Cause
ETC4 failed to cut in.
493 – AL ETC3 Cutin Failure
Yellow alarm; warning
Cause
ETC3 failed to cut in.
500 – AL Wiring POM Starter 1
Wiring fault, connection of starter 1 at POM
Yellow alarm; warning
Cause
Missing consumer.
Short circuit or wire break
501 – AL Wiring POM Starter 2
Wiring fault, connection of starter 2 at POM
Yellow alarm; warning
Cause
Missing consumer.
Short circuit or wire break
154 | Troubleshooting | MS150069/02E 2014-03
ZKP-Number: 2.3015.932
Corrective action
u Reduce power.
ZKP-Number: 18.004.202
Corrective action
u Check control valve at turbocharger 4.
ZKP-Number: 18.004.203
Corrective action
u Check control valve at turbocharger 3.
ZKP-Number: 1.4500.900
Corrective action
u Check connection between POM and starter.
ZKP-Number: 1.4500.901
Corrective action
u Check connection between POM and starter.