MTU 8V4000Lx4 Operating Instructions Manual page 126

418 – SD T-Intake Air B
Yellow alarm.
Associated parameter 1.8004.603
Cause
Intake air temperature sensor
defective, short circuit or wire
break.
419 – SD T-Coolant b.Engine
Yellow alarm.
Associated parameter 1.8004.604
Cause
Coolant temperature sensor at
engine inlet defective, short
circuit or wire break.
423 – LO P-Coolant Diff.
Red alarm. Engine stop.
Associated parameter 2.0180.921
Cause
Coolant differential pressure too
low (limit value 1). Flow too low.
429 – HI P-Coolant
Red alarm. Engine stop.
Associated parameter 2.0101.931
Cause
Coolant pressure after engine
too high (limit value 3).
430 – LO P-Coolant before Engine
Yellow alarm.
Associated parameter 2.0168.921
Cause
Coolant pressure before engine
too low (limit value 1). Flow too
low, static pressure too low.
126 | Troubleshooting | MS15026/00E 2015-05
Corrective action
u Check sensor and cabling (B49.2), replace if necessary.
Corrective action
u Check sensor and cabling (B6.3), replace if necessary.
Corrective action
u Check engine coolant circuit (pressure and flow).
Corrective action
u Check engine coolant circuit (pressure and flow).
Corrective action
u Check engine coolant circuit (pressure and flow).