MTU 12V4000L32F Operating Instructions Manual page 128

068 – SS T-Coolant
Red alarm. Engine shutdown.
Associated parameter 2.0120.932
Cause
Coolant temperature after engine
too high (limit value 2). Engine
coolant pump failure, volumetric
flow too low, air in engine coolant
circuit.
089 – SS Engine Speed too Low
Red alarm. Engine shutdown.
Associated parameter 2.2500.030
Cause
Engine stalls. In normal operation
the engine speed is below the
limit set in parameter 2.2500.027
(engine stall speed limit) and no
engine stop is applied. The engine
is shutdown for safety reasons.
090 – SS No Idling Speed
Red alarm. Start is terminated.
Associated parameter 2.1090.925
Cause
Idling speed was not attained.
091 – SS No Runup Speed
Yellow alarm.
Associated parameter 2.1090.924
Cause
The speed (starter DISENGAGE)
was not attained, ignition not
working or no gas available.
128 | Troubleshooting | MS150104/03E 2017-09
Corrective action
u Check engine coolant circuit.
Corrective action
1. In parallel operation connected to mains:
• Check mains for frequency drop.
• Check generator and coupling for damage.
2. In isolated operation:
• Check restrictor flap position.
• Check restrictor flaps for implausible closing. If restrictor flaps
are fully open: Check if load step values are admissible.
• Check bypass position.
• Check air filter for contamination, replace if contamination is
visible (→ Page 186).
• Check exhaust back pressure.
• Check differential pressure over mixture cooler.
• Check emissions and injection timing (→ Page 47) (→ Page 176).
• Check oil separator efficiency (oil in compressor intake elbow),
clean compressor as necessary.
• Check valve clearance (→ Page 180).
• Check gasket between mixture line and cylinder head for
correct installation position.
Corrective action
1. Check ignition.
2. Check gas supply.
3. Check mixture setting.
Corrective action
1. Check ignition.
2. Check gas supply.
3. Check mixture setting.