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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) without
an engine stop having taken
place. The engine is shutdown for
safety reasons.
090 – SS Starter Speed Not Reached
Red alarm. Start terminated.
Associated parameter 2.1090.925
Cause
Idle speed not reached.
091 – SS Release Speed Not Reached
Yellow alarm
Associated parameter 2.1090.924
Cause
Gas temperature sensor
defective, short circuit or wire
break.
102 | Troubleshooting | MS150122/00E 2015-07
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 throttle position.
• Check throttles for implausible closing. If throttles are fully
open: Check if load step values are admissible.
• Check bypass position.
• Check air filter for contamination, replace if contamination is
visible (→ Page 153).
• Check exhaust back pressure.
• Check differential pressure over mixture cooler.
• Check emissions and injection timing (→ Page 143).
• Check oil separator efficiency (oil in compressor intake elbow),
clean compressor as necessary.
• Check valve clearance (→ Page 148).
• 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. Not installed in all engine versions (optional).
2. Check sensor and cabling (B38), replace as necessary.
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