MTU 20 V 4000 G23 Operating Instructions Manual page 91

434 – HI T-Coolant before Engine
Limit value 1
Cause
Coolant temperature too high.
435 – SS T-Coolant before Engine
Limit value 2
Cause
Coolant temperature too high.
440 – AL L1 P-Aux 1
Limit value 1
Cause
Pressure signal of Aux 1 has
exceeded / not attained limit
value 1, depending on
configuration.
442 – AL L2 P-Aux 1
Limit value 2
Cause
Pressure signal of Aux 1 has
exceeded / not attained limit
value 2, depending on
configuration.
444 – SD U-PDU
Cause
Sensor defect of injector power
stage; internal fault of engine
governor.
445 – SD P-Ambient Air
Cause
ambient air pressure sensor
faulty.
ZKP-Number: 20.173.931
Corrective action
u Check coolant circuit.
ZKP-Number: 20.173.932
Corrective action
u Check coolant circuit.
ZKP-Number: 2.0110.921
Corrective action
u Determine and rectify reason for limit value violation.
ZKP-Number: 2.0110.931
Corrective action
u Determine and rectify reason for limit value violation.
ZKP-Number: 1.8004.578
Corrective action
u Replace ECU.
ZKP-Number: 1.8004.580
Corrective action
u Replace ECU.
MS150093/01E 2012-06 | Troubleshooting | 91