431 – SS P-Coolant Before Engine
Red alarm. Engine shutdown.
Associated parameter 2.0168.922
Cause
Corrective action
Coolant pressure before engine
too low (limit value 2). Insufficient
volume flow, static pressure too
low.
u
Check engine coolant circuit (pressure and flow).
434 – HI T-Coolant Before Engine
Yellow alarm.
Associated parameter 2.0173.931
Cause
Corrective action
Coolant temperature before
engine too high (limit value 1).
Engine coolant pump failure, flow
too low, air in engine cooling
system.
u
Check engine coolant circuit (pressure and flow).
435 – SS T-Coolant Before Engine
Red alarm. Engine shutdown.
Associated parameter 2.0173.932
Cause
Corrective action
Coolant temperature before
engine too high (limit value 2).
Engine coolant pump failure, flow
too low, air in engine cooling
system.
u
Check engine coolant circuit (pressure and flow).
443 – HI P-Charge Mix Diff.
Yellow alarm.
Associated parameter 2.0183.931
Cause
Corrective action
Difference in mixture pressures
sensed on A and B side is too high
(limit value 1).
1. Check restrictor flaps for varying positions and malfunction.
2. Check mixture lines for leakage.
3. Check sensors and cabling (B79.22, B79.21) (→ Page 203)
445 – SD P-Ambient Air
Yellow alarm.
Associated parameter 1.8004.580
Cause
Corrective action
Ambient air pressure sensor on
ECU faulty.
u
Replace Engine Control Unit ECU.
138 | Troubleshooting | MS150104/03E 2017-09
TIM-ID: 0000038612 - 003
