6.2 LOP fault messages
LOP
Fault messages and measuring points (status reports) are displayed as text messages on the LOP dis‐
play (DIS). Explanation of the displayed texts can be gathered by pressing the help key on the
touchscreen. Fault messages can also be caused by faulty sensors/actuators. Contact Service to have
sensors/actuators checked and replaced as necessary if the troubleshooting measures listed in the table
below prove unsuccessful.
Display text Meaning Measure
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 243).
3. Perform LOP test procedures
(→ Page 245).
4. Check ECU plug connection
(→ Page 238).
5. Check engine wiring (→ Page 234).
AL Shutdown Expect‐
ed
Yellow alarm occurred; Red alarm with
engine shutdown will probably follow
1. Start other genset
as preventive measure.
2. Determine cause of yellow alarm
and rectify.
AL Battery Charge
Fault
Battery not being charged 1. Check power circuit breakers and
fuses.
2. Check transistorized regulator.
AL Press. Monitoring
Fail (EMU)
EMU pressure monitoring failure Contact Service.
• Have EMU replaced.
AL ECU Defective ECU 4 is defective 1. Check LOP visually (→ Page 243).
2. Perform LOP test procedures
(→ Page 245).
3. Check ECU plug connection
(→ Page 238).
4. Check engine wiring (→ Page 234).
5. Contact Service.
• Have ECU checked and re‐
placed if required.
AL Output Stage
Bank 1 Fault
Fault message re. power amplifier, cyl‐
inder bank A
1. Check LOP visually (→ Page 243).
2. Perform LOP test procedures
(→ Page 245).
3. Check ECU plug connection
(→ Page 238).
4. Check engine wiring (→ Page 234).
5. Contact Service.
• Have ECU checked and re‐
placed if required.
152 | Troubleshooting | MW15550/06E 2012-02
TIM-ID: 0000008898 - 002
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