MTU 8V4000Lx4 Operating Instructions Manual page 117

068 – SS T-Coolant
Red alarm. Engine stop.
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 stop.
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 shut down
for safety reasons.
090 – SS Starter Speed Not Reached
Red alarm. Start terminated.
Associated parameter 2.1090.925
Cause
Idling speed was not attained.
091 – SS Release Speed Not Reached
Red alarm.
Associated parameter 2.1090.924
Cause
Gas temperature sensor
defective, short circuit or wire
break.
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 173).
• Check exhaust back pressure.
• Check differential pressure over mixture cooler.
• Check emissions and injection timing (→ Page 163).
• Check oil separator efficiency (oil in compressor intake
elbow), clean compressor if necessary.
• Check valve clearance (→ Page 168).
• 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 available in all engine versions (optional).
2. Check sensor and cabling (B38), replace as necessary.
MS15026/00E 2015-05 | Troubleshooting | 117