MTU 12 V 4000 M23F Operating Instructions Manual page 102

37 – SS ETC2 Overspeed
Speed of 1st secondary turbocharger too high (limit value 2)
Red alarm; engine shutdown
Cause
Clogged charge-air circuit or
fault in turbocharger.
38 – AL ETC Speed Deviation
Yellow alarm; warning
Cause
Synchro fault between primary
turbocharger and one of the
secondary turbochargers.
39 – AL ETC2 Cut-in Fault
Yellow alarm; warning
Cause
ETC2 failed to cut in.
44 – LO Coolant Level Charge-Air Cooler
Coolant level of charge-air cooler too low (limit value 1)
Yellow alarm; warning
Cause
Insufficient charge-air coolant,
e.g. due to leaks in the charge-
air coolant circuit.
51 – HI T-Lube Oil
Lube oil temperature too high (limit value 1)
Yellow alarm; warning
Cause
Insufficient oil.
102 | Troubleshooting | MS150068/01E 2014-01
ZKP-Number: 2.3013.912
Corrective action
u Contact Service.
ZKP-Number: 1.8004.205
Corrective action
u Contact Service.
ZKP-Number: 1.8004.204
Corrective action
u Contact Service.
ZKP-Number: 2.0153.921
Corrective action
1. Check coolant level (→ Page 234).
2. Contact Service.
ZKP-Number: 2.0125.931
Corrective action
1. Reduce power.
2. Check engine oil level (→ Page 218).
3. Contact Service.