6.2 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. Contact Service to have sensors/actuators tested and replaced as nec‐
essary if troubleshooting as described in the table below proves unsuccessful.
Display text Meaning Task
AL RCS Speed De‐
mand Defect
No speed demand signal 1. Check remote control system;
2. Check LOP visually (→ Page 154).
3. Perform LOP test procedures
(→ Page 156).
4. Check ECU plug-in connections
(→ Page 149).
5. Check engine wiring (→ Page 145).
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 154).
2. Perform LOP test procedures
(→ Page 156).
3. Check ECU plug-in connections
(→ Page 149).
4. Check engine wiring (→ Page 145).
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 154).
2. Perform LOP test procedures
(→ Page 156).
3. Check ECU plug-in connections
(→ Page 149).
4. Check engine wiring (→ Page 145).
5. Contact Service
• Have ECU checked and re‐
placed, if required.
AL Power Amplifier 2
Fail
Power amplifier cylinder side B failure 1. Check LOP visually (→ Page 154).
2. Perform LOP test procedures
(→ Page 156).
3. Check ECU plug-in connections
(→ Page 149).
4. Check engine wiring (→ Page 145).
5. Contact Service
• Have ECU checked and re‐
placed, if required.
AL Gear Control Fail
(GCU)
GCU failure Contact Service
• Have GCU solenoid valve checked
and replaced, if required;
• Have GCU wiring checked and re‐
placed, if required.
70 | Troubleshooting | MW15407/14E 2012-02
TIM-ID: 0000008901 - 001
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