5.2 LOP alarms
LOP
At the LOP, alarm texts and measuring-point messages are indicated on the DIS. Explanation of the dis‐
played texts can be gathered by pressing the help key on the touch screen. Alarms can also be caused
by defective sensors / actuators. If troubleshooting in accordance with the following table is not success‐
ful, contact Service to have the sensors / actuators checked and, if required, replaced.
Display text Meaning Task
AL RCS Speed De‐
mand Defect
No speed demand signal 1. Check speed demand source sys‐
tem (e. g. from automatic on-board
network).
2. Check LOP visually (→ Page 181);
3. Perform LOP test procedures
(→ Page 183).
4. Check ECU plug-in connections
(→ Page 176).
5. Check engine wiring (→ Page 172).
AL Shutdown Expect‐
ed
Yellow alarm occurred; Red alarm with
engine shutdown will probably follow
1. Start the other genset
as a preventive measure.
2. Determine cause of yellow alarm
and rectify.
AL Battery Charger
Fail
No battery charging 1. Check power circuit breakers and
fuses.
2. Check transistor controllers.
AL Press Monitoring
Fail (EMU)
EMU pressure monitoring failure Contact Service
• Have EMU replaced.
AL ECU Defect ECU 4 is defective 1. Check LOP visually (→ Page 181).
2. Perform LOP test procedures
(→ Page 183).
3. Check ECU plug-in connections
(→ Page 176).
4. Check engine wiring (→ Page 172).
5. Contact Service
• Have ECU checked and re‐
placed, if required.
AL Power Amplifier 1
Fail
Power amplifier cylinder side A failure 1. Check LOP visually (→ Page 181).
2. Perform LOP test procedures
(→ Page 183).
3. Check ECU plug-in connections
(→ Page 176).
4. Check engine wiring (→ Page 172).
5. Contact Service
• Have ECU checked and re‐
placed, if required.
MS150031/03E 2011-10 | Troubleshooting | 99
TIM-ID: 0000008898 - 001
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