MTU 12 V 4000 L62FB Operating Instructions Manual page 107

423 – LO P-Coolant Diff.
Red alarm. Engine shutdown.
Associated parameter 2.0180.921
Cause
Coolant differential pressure too
low (limit value 1). Insufficient
volume flow.
429 – HI P-Coolant
Red alarm. Engine shutdown.
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). Insufficient
volume flow, static pressure too
low.
431 – SS P-Coolant Before Engine
Red alarm. Engine shutdown.
Associated parameter 2.0168.922
Cause
Coolant pressure before engine
too low (limit value 2). Insufficient
volume flow, static pressure too
low.
434 – HI T-Coolant Before Engine
Yellow alarm.
Associated parameter 2.0173.931
Cause
Coolant temperature before
engine too high (limit value 1).
Engine coolant pump failure, flow
too low, air in engine cooling
system.
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).
Corrective action
u Check engine coolant circuit (pressure and flow).
Corrective action
u Check engine coolant circuit (pressure and flow).
MS150098/02E 2016-11 | Troubleshooting | 107