MTU 12 V 4000 Lx4 Operating Instructions Manual page 111

021 – HI T-Exhaust B
Yellow alarm.
Associated parameter 2.0127.931
Cause
Exhaust gas temperature (B
side) after turbine too high (limit
value 1). Incorrect ignition
timing, mixture too lean or too
rich, damage to turbine.
022 – SS T-Exhaust B
Yellow alarm.
Associated parameter 2.0127.932
Cause
Exhaust gas temperature (B
side) after turbine too high (limit
value 2). Incorrect ignition
timing, mixture too lean or too
rich, damage to turbine.
025 – HI P-Diff. Lube Oil
Yellow alarm.
Associated parameter 2.0154.931
Cause
Pressure loss via oil filter too
high (limit value 1).
026 – HI P-Diff. Lube Oil
Red alarm. Engine stop.
Associated parameter 2.0154.932
Cause
Pressure loss via oil filter too
high (limit value 2).
030 – SS Engine Overspeed
Red alarm. Engine stop.
Associated parameter 2.2510.932
Cause
Overspeed detected by ECU.
This fault message usually
follows other fault messages.
Checking governor, throttle
closing position.
Corrective action
1. Check exhaust turbocharger.
2. Check ignition timing (→ Page 160).
3. Check mixture setting.
4. Check spark plugs.
Corrective action
1. Check exhaust turbocharger.
2. Check ignition timing (→ Page 160).
3. Check mixture setting.
4. Check spark plugs.
Corrective action
1. Replace oil filter (→ Page 176).
2. If this fault occurs again after unexpectedly short filter runtime,
check oil filter for deposits, change oil if required (→ Page 174).
Corrective action
1. Replace oil filter (→ Page 176).
2. If this fault occurs again after unexpectedly short filter runtime,
check oil filter for deposits, change oil if required (→ Page 174).
Corrective action
1. Check governor.
2. Check throttle closing position.
MS15027/00E 2013-10 | Troubleshooting | 111