MTU 12 V 4000 L63 Operating Instructions Manual page 121

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). Volumetric
flow too low, 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,
volumetric flow too low, air in
engine coolant circuit.
435 – SS T-Coolant before Engine
Red alarm. Engine shutdown.
Associated parameter 2.0173.932
Cause
Coolant temperature before
engine too high (limit value 2).
Engine coolant pump failure,
volumetric flow too low, air in
engine coolant circuit.
443 – HI P-Charge Mix Diff.
Yellow alarm.
Associated parameter 2.0183.931
Cause
Difference in mixture pressures
sensed on A and B side is too
high (limit value 1).
ZKP-Number:
Corrective action
u Check engine coolant circuit (pressure and volumetric flow).
ZKP-Number:
Corrective action
u Check engine coolant circuit (pressure and volumetric flow).
ZKP-Number:
Corrective action
u Check engine coolant circuit (pressure and volumetric flow).
ZKP-Number:
Corrective action
1. Check throttles for varying positions and malfunction.
2. Check mixture lines for leakage.
3. Check sensors and cabling (B79.22, B79.21).
MS150058/01E 2012-07 | Troubleshooting | 121